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REVIEW 3 major objections 7 minor 61 references

Frequency auto-homogenization using group-velocity-matched downconversion

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Pith's one-line read A group-velocity-matched downconversion device erases spectral distinguishability among single photons by mapping every input spectrum within a pump-defined window onto the same 1.55 µm output mode, without a priori knowledge of each…

desk verdict A clever device concept for erasing spectral distinguishability, with sound theory and a preliminary classical measurement; the main quantitative claim needs a dispersion-sensitivity check. read the letter →

arxiv 2502.02466 v1 pith:JSX2SLFJ submitted 2025-02-04 quant-ph physics.app-phphysics.optics

Dylan Heberle , Christopher C. Tison , James Schneeloch , A. Matthew Smith , Paul M. Alsing , Jeffrey Moses , Michael L. Fanto This is my paper · ORCID
classification quant-phphysics.app-phphysics.optics PACS 42.65.Ky42.50.Ar03.67.-a
keywords frequencyauto-homogenizationgroup-velocitymatchingquantumconversiondifference-frequencygenerationspectraldistinguishabilityjointcouplingamplitudeSchmidtdecompositionbroadbandpump
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper proposes a device that removes spectral distinguishability among single photons coming from imperfect, inhomogeneous emitters. The device is a difference-frequency downconversion stage in which the pump field is group-velocity matched to the input field, so the phase-matching function lies parallel to the input-frequency axis. A broadband pump then defines a window over which every input spectrum is mapped by the joint coupling amplitude onto the same output spectral mode near 1.55 µm, with no a priori knowledge of each emitter's carrier frequency and no per-source tuning. If correct, this gives a route to high-yield indistinguishable single photons from ensembles of integrated sources for quantum computing and networking. The paper supports the claim with analytic theory, split-step Fourier pulse-propagation simulations, and proof-of-principle measurements of the joint coupling intensity in Rb:KTP waveguides.

What carries the argument

The joint coupling amplitude (JCA) $f(\omega_i,\omega_o)=s^*(\omega_i-\omega_o)\phi(\omega_i,\omega_o)$ is the central object; it maps input spectral amplitudes to output amplitudes through $\beta^*(\omega_o)=\int d\omega_i\, f(\omega_i,\omega_o)\alpha^*(\omega_i)$. The device is engineered by the group-velocity-matching condition $v_i=v_p$, which makes the phase-matching function $\phi$ horizontal so the JCA is wide along the input-frequency axis and narrow along the output-frequency axis, and by a broadband pump amplitude $s^*$ that covers the input distribution along the energy-conservation line. Schmidt decomposition of the JCA yields the input and output mode bases; near-unit purity means one dominant Schmidt mode, so the conversion behaves as a single beamsplitter interaction between a fixed input mode and a fixed output mode. Interferometric visibility between outputs generated from different input frequencies is the quantitative homogenization metric.

What would settle it

Measure the ridge of the joint coupling intensity for input detunings out to about $\pm 10$ nm: if it tilts away from the input-frequency axis, or if two-photon interference visibility between the 1.55 µm outputs of inputs separated by 20 nm falls below 0.9, the homogenization claim fails.

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Extended reading notes

Core claim

The central claim is that the joint coupling amplitude $f(\omega_i,\omega_o)=s^*(\omega_i-\omega_o)\phi(\omega_i,\omega_o)$ can be engineered so that the phase-matching function $\phi$ is horizontal in the $(\omega_i,\omega_o)$ plane. Expanding the wavenumbers to first order, the tilt angle is $\Theta = \tan^{-1}\left[(v_i^{-1}-v_p^{-1})/(v_p^{-1}-v_o^{-1})\right]$, which vanishes exactly when the input and pump group velocities are equal, $v_i=v_p$. With a broadband pump spectral amplitude $s^*$ covering the inhomogeneous input distribution along the energy-conservation line, the JCA becomes an elongated ridge that is wide along $\omega_i$ and narrow along $\omega_o$, so any input spectrum inside the window maps to the same output mode. Schmidt decomposition of this JCA for a 2.5-mm Rb:KTP waveguide gives Schmidt number $1.094$ and purity $0.914$, and split-step Fourier simulations show cross-correlation visibility above $0.9$ for input center wavelengths spanning about $20$ nm. Measured joint coupling intensities in Rb:KTP waveguides show the horizontal phase-matching ridge cropped by the pump bandwidth, confirming the required JCA shape.

Load-bearing premise

The scheme depends on the phase-matching function remaining horizontal across the whole input window, which the first-order group-velocity match provides; if higher-order dispersion tilts that ridge, input photons of different colors will end up in different output modes and the homogenization is lost.

Editorial extensions

If this is right

  • A frequency auto-homogenization stage placed after an inhomogeneous ensemble of integrated single-photon emitters should convert all of them to a common 1.55 µm mode without per-source temperature, stress, or Stark tuning.
  • For the 2.5-mm Rb:KTP device with a 50-nm FWHM pump, the homogenization window is about 20 nm wide at the V = 0.9 visibility level, and about 10 nm at V > 0.99.
  • Conversion efficiency for narrowband inputs is set by the temporal overlap between the short transform-limited pump and the input pulse; chirping the pump to 10 ps raises the 1-nm input efficiency from roughly 0.7% to 46.6%, at the cost of temporal distinguishability.
  • The group-velocity-matching condition can be met in other crystals and wavelength ranges (including birefringent phase matching), so the method extends beyond the 565 nm-to-1550 nm proof-of-principle.
  • Measured joint coupling intensities in the Rb:KTP waveguides show the expected horizontal phase-matching ridge cropped by the pump spectrum, confirming the JCA shape required for homogenization.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If conversion efficiency can be raised while keeping the JCA pure, auto-homogenization would let an entire ensemble of nominally different emitters feed a single indistinguishable-photon resource, replacing per-source spectral locking and active feed-forward spectral multiplexing.
  • The same JCA-engineering argument should work in reverse (upconversion) and in dispersion-engineered integrated platforms, which could bring homogenization onto photonic chips at other wavelength pairs.
  • A direct quantum test would be two-photon interference between the 1.55 µm outputs of two homogenizers driven by input photons detuned by tens of nanometers; high visibility would confirm that homogenization survives at the single-photon level and is not just a classical JCI feature.
  • The paper's visibility metric quantifies spectral indistinguishability; whether the process also homogenizes temporal mode structure would need separate pulsed-pump characterization, since chirping the pump trades temporal distinguishability for efficiency.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 7 minor

Summary. This paper proposes a device based on group-velocity-matched difference-frequency generation with a broadband pump to convert spectrally distinguishable single photons from a heterogeneous ensemble into a single output spectral mode at 1.55 µm. The authors derive the joint coupling amplitude (JCA) for the downconversion process, show that the phase-matching function becomes horizontal when the input and pump group velocities are equal, and introduce Schmidt decomposition and an interferometric visibility metric to quantify homogenization. They present split-step Fourier simulations for a 2.5-mm Rb:KTP waveguide predicting visibilities above 0.9 over an ~20-nm input window, and they report measurements of the JCA magnitude using a classical sum-frequency setup in Rb:KTP waveguides as preliminary experimental evidence.

Significance. The idea of using a broadband pump with group-velocity-matched downconversion to erase spectral distinguishability without feed-forward or individual source tuning is original and relevant to scalable photonic quantum information. The theory is internally consistent, the simulations are forward calculations from a stated Hamiltonian, and the Schmidt/visibility analysis provides a clear metric. The main limitations are that the central bandwidth claim is not supported by a quantitative dispersive analysis, and the experimental evidence is indirect, being based on a classical sum-frequency measurement rather than a direct test of the downconversion homogenization.

major comments (3)
  1. [Section III, Eqs. (9)-(14)] The central claim of a ~20-nm homogenization window (Fig. 3(c)) rests on the phase-matching function remaining horizontal (Θ = 0) over that window. The manuscript does not state whether Δk in Eq. (9) is evaluated using the full wavelength-dependent k(ω) from the AdvR data or using the first-order expansion in Eqs. (10)-(13). If the first-order expansion was used, the calculation omits the second- and higher-order dispersion that would tilt the PMF away from the input-frequency axis; if the full Sellmeier data was used, the paper should provide a quantitative estimate of the residual PMF tilt (e.g., a plot of Δk at fixed output frequency as a function of input detuning, or the coefficient of Ω_i^2 in the expansion of Δk) so that the 20-nm bandwidth can be assessed against realistic dispersion uncertainty. As written, the visibility curve in Fig. 3(c) is not yet supported by a sensitivity analysis.
  2. [Section IV, Fig. 6] The experimental JCA is measured via sum-frequency generation (CW telecom laser at 1.52-1.6 µm combined with a broadband pump at 875 nm, detecting visible output), whereas the proposed homogenization uses difference-frequency generation (visible input at ~565 nm and pump at ~890 nm producing telecom output). These are not the same process: for the upconversion measurement, a horizontal PMF in the (telecom, visible) plane requires the telecom and pump group velocities to be equal, while the theory's homogenization condition is equality of the visible input and pump group velocities (Eq. (14)). The manuscript does not explain how the measured upconversion JCA confirms the downconversion homogenization, nor does it state the wavelengths and dispersion data used to generate the calculated JCA in Fig. 6 for comparison. Please provide the equivalence argument or measure the downconversion JCA directly.
  3. [Section IV and Section V] The experimental support is presented as proof-of-principle, but the measured joint coupling intensity (JCI) is obtained from a classical, intense pump and a CW telecom laser, and it does not test the quantum state mapping that the paper claims. In particular, the conclusion in Section V that 'This measurement confirms that the necessary PMF and pump amplitude for homogenization have been achieved' is stronger than what can be inferred from a classical SFG intensity pattern. The paper should either soften this conclusion to state that the measurement is consistent with the required phase-matching and pump spectral amplitude, or provide a quantum-optical measurement (e.g., two-photon interference of converted photons from two different input frequencies) to substantiate the homogenization claim.
minor comments (7)
  1. [Introduction] The word 'distinghishability' after reference [13] is a typo for 'distinguishability'.
  2. [Section V] The word 'currenlty' in the first paragraph of the Discussion is a typo for 'currently'.
  3. [Eq. (10)] Equation (10) uses the symbol ωj for both the carrier frequency and the running frequency; please introduce a separate notation for the carrier (e.g., ω̄j) to avoid confusion in the expansion.
  4. [Section III vs. Section IV] The theory and simulations use a pump wavelength of 0.89 µm, while the experiment uses a pump centered at 875 nm; please justify this difference and state whether the experimental waveguides are phase-matched for the 0.89-µm pump.
  5. [Fig. 3(c)] The caption and text do not specify which symbol in Fig. 3(c) corresponds to the split-step simulation for which input bandwidth; while the text says the visibilities are the same for 0.1, 1, and 5 nm, it would help to add a legend or state that all open circles are for 1-nm inputs.
  6. [Appendix A] The sentence 'noting that the interaction is zero outside of the integration limits' is vague; please specify the time limits of the integral and the rotating-wave approximation made in deriving Eq. (A8).
  7. [Section III] For reproducibility, please include the refractive-index data or Sellmeier coefficients used in the JCA calculation, or cite a public source, since the current statement 'determined from data provided by AdvR Inc' is not sufficient for independent verification.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity: the horizontal-PMF condition is derived from a dispersion expansion and checked by forward simulation and experiment; the sole self-citation [53] supplies a standard Hamiltonian and is not load-bearing.

full rationale

The paper's derivation is forward-acting and does not reduce to its own inputs. The condition for a horizontal phase-matching function is obtained analytically in Eqs. (10)-(14) by a first-order Taylor expansion of the wavenumbers; the device is then chosen at a wavelength pair where vi=vp using vendor refractive-index data, and the JCA is computed from Eq. (8) with no parameter fitted to the homogenization target. Eq. (7) maps input spectra through that independently computed JCA, and the claim that different input spectra converge to one output mode follows from the near-rank-one Schmidt structure of the engineered JCA, not from assuming the conclusion. The split-step Fourier simulations independently integrate the propagation equations, and the measured JCI in Fig. 6 is an experimental check of the PMF/pump shape. The only self-citation is [53], used in Appendix A for the standard chi(2) frequency-conversion Hamiltonian; that cited work derives a general Hamiltonian that does not assume the present auto-homogenization result, so it is independent support rather than a circular premise. The unquantified effect of higher-order dispersion tilting the PMF over the claimed ~20 nm window is a legitimate correctness risk, but it is not a circularity: the paper simply does not yet bound that effect.

Assumptions & free parameters 4 free parameters · 6 assumptions · 0 invented entities

The central claim rests on standard nonlinear-optics modeling assumptions, including a classical undepleted pump, first-order perturbation, Gaussian beams, and Sellmeier dispersion, and on design choices such as the 50-nm pump and 2.5-mm crystal that set the homogenization bandwidth. No invented physical entities are introduced.

free parameters (4)
  • Pump spectral FWHM bandwidth = 50 nm
    Chosen for the simulations; the homogenization bandwidth of about 20 nm with visibility above 0.9 scales with this choice.
  • Nonlinear crystal length L = 2.5 mm
    Chosen for the Rb:KTP proof-of-principle device; sets the sinc width of the phase-matching function and therefore the output spectral window.
  • Input beam size relative to pump = half the pump beam size
    Chosen in the simulations; affects the phase-matching overlap in Eq. A5-A6 and the conversion efficiency.
  • Pump chirp / normal group delay dispersion = chirped to 10 ps in the 46.6% efficiency case
    Introduced in Sec. III to raise conversion efficiency; creates a tradeoff with temporal distinguishability.
assumptions (6)
  • domain assumption The frequency-conversion Hamiltonian in Eq. A2, following ref [53], correctly describes collinear DFG with a classical pump.
    Used to derive the joint coupling amplitude and hence the homogenization mapping without further justification in this paper.
  • domain assumption Time ordering can be ignored and first-order perturbation theory suffices because conversion is stimulated by the input field.
    Invoked after Eq. 4 with ref [44]; limits the validity to low conversion efficiency.
  • domain assumption Wavenumbers can be expanded to first order around carrier frequencies, making the phase-matching orientation linear.
    Eqs. 10-13; higher-order dispersion is neglected, which is the key to the horizontal phase-matching function.
  • domain assumption Gaussian collimated beams and interaction well within the Rayleigh range justify the simplified phase-matching integral in Eq. A5-A6.
    Used to obtain the sinc phase-matching function and to normalize the joint coupling amplitude.
  • domain assumption Refractive index data for Rb:KTP provided by AdvR Inc are accurate.
    Determines the group-velocity-matching wavelengths and phase-matching orientation; the data are not included in the paper.
  • domain assumption Classical-field cross-correlation visibility in Eq. 25-26 quantifies single-photon spectral indistinguishability.
    Used to claim homogenization from simulations without a quantum interference measurement.

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Cite this review

Pith. "Pith review of Frequency auto-homogenization using group-velocity-matched downconversion." pith.science (2026). https://pith.science/paper/JSX2SLFJ

@misc{pith2026250202466,
  author       = {Pith},
  title        = {Pith review of: Frequency auto-homogenization using group-velocity-matched downconversion},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/JSX2SLFJ}},
  note         = {Machine review of arXiv:2502.02466}
}
abstract

With the stability of integrated photonics at network nodes and the advantages of photons as flying qubits, photonic quantum information processing (PQIP) makes quantum networks increasingly scalable. However, scaling up PQIP requires the preparation of many identical single photons which is limited by the spectral distinguishability of integrated single-photon sources due to variations in fabrication or local environment. To address this, we introduce frequency auto-homogenization via group-velocity-matched downconversion to remove spectral distinguishability in varying quantum emitters. We present our theory using $\chi^{(2)}$ quantum frequency conversion and show proof-of-principle data in a free-space optical setup.

Figures

Figures reproduced from arXiv: 2502.02466 by the authors.

Figure 1
Figure 1. FIG. 1: Depiction of frequency auto-homogenization. (Left) Magnitude of a JCA ( [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2: Absolute value of the JCA ( [PITH_FULL_IMAGE:figures/full_fig_p011_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3: (a) Example inhomogeneous input spectra with 1-nm FWHM bandwidths before [PITH_FULL_IMAGE:figures/full_fig_p012_3.png] view at source ↗
Figures from the paper (4 more)
Figure 4
Figure 4. Figure 4: FIG. 4: Conversion efficiencies from pulse propagation simulations for input fields of [PITH_FULL_IMAGE:figures/full_fig_p013_4.png]
Figure 5
Figure 5. Figure 5: FIG. 5: Experimental setup showing (a) the broadened pump spectrum used to drive the [PITH_FULL_IMAGE:figures/full_fig_p013_5.png]
Figure 6
Figure 6. Figure 6: FIG. 6: Comparison of the magnitudes of (a) the calculated JCA and (b) the measured [PITH_FULL_IMAGE:figures/full_fig_p014_6.png]
Figure 7
Figure 7. Figure 7: FIG. 7: JCA magnitudes measured for (a) device 1, (b) device 2, and (c) device 3. The [PITH_FULL_IMAGE:figures/full_fig_p018_7.png]

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Works this paper leans on

61 extracted references · 52 canonical work pages

  1. [1]

    T. C. Ralph, A. G. White, W. J. Munro, and G. J. Milburn, Simple scheme for efficient linear optics quantum gates, Phys. Rev. A 65, 012314 (2001). Approved for Public Release; Distribution Unlimited: PA#: AFRL-2024-6366 20

    work page 2001

  2. [2]

    D. E. Browne and T. Rudolph, Resource-efficient linear optical quantum computation, Phys. Rev. Lett. 95, 010501 (2005)

    work page 2005

  3. [3]

    Knill, Fault-tolerant postselected quantum computation: Threshold analysis (2004)

    E. Knill, Fault-tolerant postselected quantum computation: Threshold analysis (2004)

    work page 2004

  4. [4]

    P. P. Rohde and T. C. Ralph, Frequency and temporal effects in linear optical quantum computing, Phys. Rev. A 71, 032320 (2005)

    work page 2005

  5. [5]

    C. M. Dawson, H. L. Haselgrove, and M. A. Nielsen, Noise thresholds for optical quantum computers, Phys. Rev. Lett. 96, 020501 (2006)

    work page 2006

  6. [6]

    P. P. Rohde and T. C. Ralph, Error models for mode mismatch in linear optics quantum computing, Phys. Rev. A 73, 062312 (2006)

    work page 2006

  7. [7]

    V. S. Shchesnovich, Sufficient condition for the mode mismatch of single photons for scalability of the boson-sampling computer, Phys. Rev. A 89, 022333 (2014)

    work page 2014

  8. [8]

    V. S. Shchesnovich, Partial indistinguishability theory for multiphoton experiments in multi- port devices, Phys. Rev. A 91, 013844 (2015)

    work page 2015

Show all 61 references
  1. [9]

    M. C. Tichy, Interference of identical particles from entanglement to boson-sampling, J. Phys. B: At. Mol. Opt. Phys. 47, 103001 (2014)

    2014

  2. [10]

    M. C. Tichy, Sampling of partially distinguishable bosons and the relation to the multidimen- sional permanent, Phys. Rev. A 91, 022316 (2015)

    2015

  3. [11]

    P. P. Rohde, Boson sampling with photons of arbitrary spectral structure, Phys. Rev. A 91, 012307 (2015)

    2015

  4. [12]

    Shi and T

    J. Shi and T. Byrnes, Effect of partial distinguishability on quantum supremacy in gaussian boson sampling, NPJ Quantum Inf. 8, 10.1038/s41534-022-00557-9 (2022)

    2022 doi

  5. [13]

    Zhong, H

    H.-S. Zhong, H. Wang, Y.-H. Deng, M.-C. Chen, L.-C. Peng, Y.-H. Luo, J. Qin, D. Wu, X. Ding, Y. Hu, P. Hu, X.-Y. Yang, W.-J. Zhang, H. Li, Y. Li, X. Jiang, L. Gan, G. Yang, L. You, Z. Wang, L. Li, N.-L. Liu, C.-Y. Lu, and J.- W. Pan, Quantum computational advantage using photo...

    2020 doi

  6. [14]

    Wehner, D

    S. Wehner, D. Elkouss, and R. Hanson, Quantum internet: A vision for the road ahead, Science 362, eaam9288 (2018), https://www.science.org/doi/pdf/10.1126/science.aam9288

    2018 doi

  7. [15]

    Aharonovich, D

    I. Aharonovich, D. Englund, and M. Toth, Solid-state single-photon emitters, Nature Photon- ics 10, 631 (2016). Approved for Public Release; Distribution Unlimited: PA#: AFRL-2024-6366 21

    2016

  8. [16]

    X. Ding, Y. He, Z.-C. Duan, N. Gregersen, M.-C. Chen, S. Unsleber, S. Maier, C. Schneider, M. Kamp, S. H¨ ofling, C.-Y. Lu, , and J.-W. Pan, On-demand single photons with high extrac- tion efficiency and near-unity indistinguishability from a resonantly driven quantum dot in a...

    2016 doi

  9. [17]

    Sipahigil, M

    A. Sipahigil, M. L. Goldman, E. Togan, Y. Chu, M. Markham, D. J. Twitchen, A. S. Zibrov, A. Kubanek, and M. D. Lukin, Quantum interference of single photons from remote nitrogen- vacancy centers in diamond, Phys. Rev. Lett. 108, 10.1103/PhysRevLett.108.143601 (2012)

    2012 doi

  10. [18]

    Kumar, Quantum frequency conversion, Opt

    P. Kumar, Quantum frequency conversion, Opt. Lett. 15, 1476 (1990)

    1990

  11. [19]

    Ikuta, Y

    R. Ikuta, Y. Kusaka, T. Kitano, H. Kato, T. Yamamoto, M. Koashi, and N. Imoto, Wide-band quantum interface for visible-to-telecommunication wavelength conversion, Nat. Commun. 2, 537 (2011)

    2011

  12. [20]

    Zaske, A

    S. Zaske, A. Lenhard, C. A. Keßler, J. Kettler, C. Hepp, C. Arend, R. Albrecht, W.-M. Schulz, M. Jetter, P. Michler, and C. Becher, Visible-to-telecom quantum frequency conversion of light from a single quantum emitter, Phys. Rev. Lett. 109, 147404 (2012)

    2012

  13. [21]

    De Greve, L

    K. De Greve, L. Yu, P. L. McMahon, J. S. Pelc, C. M. Natarajan, N. Y. Kim, E. Abe, S. Maier, C. Schneider, M. Kamp, S. H¨ ofling, R. H. Hadfield, A. Forchel, M. M. Fejer, and Y. Yamamoto, Quantum-dot spin–photon entanglement via frequency downconversion to telecom wavelength, ...

    2012

  14. [22]

    Albrecht, P

    B. Albrecht, P. Farrera, X. Fernandez-Gonzalvo, M. Cristiani, and H. de Riedmatten, A waveguide frequency converter connecting rubidium-based quantum memories to the telecom C-band, Nat. Commun. 5, 3376 (2014)

    2014

  15. [23]

    Q. Li, M. Davan¸ co, and K. Srinivasan, Efficient and low-noise single-photon-level frequency conversion interfaces using silicon nanophotonics, Nat. Photonics 10, 406 (2016)

    2016

  16. [24]

    Dr´ eau, A

    A. Dr´ eau, A. Tchebotareva, A. E. Mahdaoui, C. Bonato, and R. Hanson, Quantum frequency conversion of single photons from a nitrogen-vacancy center in diamond to telecommunication wavelengths, Physical review applied 9, 064031 (2018)

    2018

  17. [25]

    M. Bock, P. Eich, S. Kucera, M. Kreis, A. Lenhard, C. Becher, and J. Eschner, High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion, Nature communications 9, 1998 (2018)

    2018

  18. [26]

    Da Lio, C

    B. Da Lio, C. Faurby, X. Zhou, M. L. Chan, R. Uppu, H. Thyrrestrup, S. Scholz, A. D. Wieck, A. Ludwig, P. Lodahl, et al., A pure and indistinguishable single-photon source at Approved for Public Release; Distribution Unlimited: PA#: AFRL-2024-6366 22 telecommunication waveleng...

    2022

  19. [27]

    Kiraz, P

    A. Kiraz, P. Michler, C. Becher, B. Gayral, A. Imamo˘ glu, L. Zhang, E. Hu, W. V. Schoenfeld, and P. M. Petroff, Cavity-quantum electrodynamics using a single inas quantum dot in a microdisk structure, Applied Physics Letters 78, 3932 (2001), https://doi.org/10.1063/1.1379987

    2001 doi

  20. [28]

    Faraon, D

    A. Faraon, D. Englund, I. Fushman, J. Vuˇ ckovi´ c, N. Stoltz, and P. Petroff, Local quan- tum dot tuning on photonic crystal chips, Applied Physics Letters 90, 213110 (2007), https://doi.org/10.1063/1.2742789

    2007 doi

  21. [29]

    Seidl, M

    S. Seidl, M. Kroner, A. H¨ ogele, K. Karrai, R. J. Warburton, A. Badolato, and P. M. Petroff, Effect of uniaxial stress on excitons in a self-assembled quantum dot, Applied Physics Letters 88, 203113 (2006), https://doi.org/10.1063/1.2204843

    2006 doi

  22. [30]

    Findeis, M

    F. Findeis, M. Baier, E. Beham, A. Zrenner, and G. Abstreiter, Photocurrent and photolumi- nescence of a single self-assembled quantum dot in electric fields, Applied Physics Letters 78, 2958 (2001), https://doi.org/10.1063/1.1369148

    2001 doi

  23. [31]

    J. J. Dubowski, R. Stanowski, D. Dalacu, and P. J. Poole, Precision tuning of inas quantum dot emission wavelength by iterative laser annealing, Optics & Laser Technology 103, 382 (2018)

    2018

  24. [32]

    H. Yu, C. Yuan, R. Zhang, Z. Zhang, H. Li, Y. Wang, G. Deng, L. You, H. Song, Z. Wang, G.- C. Guo, and Q. Zhou, Spectrally multiplexed heralded single photon source at telecom-band (2021), arXiv:2104.02593 [quant-ph]

    2021 arXiv

  25. [33]

    Grimau Puigibert, G

    M. Grimau Puigibert, G. H. Aguilar, Q. Zhou, F. Marsili, M. D. Shaw, V. B. Verma, S. W. Nam, D. Oblak, and W. Tittel, Heralded single photons based on spectral multiplexing and feed-forward control, Phys. Rev. Lett. 119, 083601 (2017)

    2017

  26. [34]

    M. Nobuyuki, Deterministic reshaping of single-photon spectra us- ing cross-phase modulation, Science Advances 2, e1501223 (2016), https://www.science.org/doi/pdf/10.1126/sciadv.1501223

    2016 doi

  27. [35]

    Takesue, Erasing distinguishability using quantum frequency up-conversion, Phys

    H. Takesue, Erasing distinguishability using quantum frequency up-conversion, Phys. Rev. Lett. 101, 173901 (2008)

    2008

  28. [36]

    S. Ates, I. Agha, A. Gulinatti, I. Rech, M. T. Rakher, A. Badolato, and K. Srinivasan, Two- photon interference using background-free quantum frequency conversion of single photons emitted by an InAs quantum dot, Phys. Rev. Lett. 109, 147405 (2012). Approved for Public Release...

    2012

  29. [37]

    J. H. Weber, B. Kambs, J. Kettler, S. Kern, J. Maisch, H. Vural, M. Jetter, S. L. Portalupi, C. Becher, and P. Michler, Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters, Nat. Nanotechnol. 14, 23 (2019)

    2019

  30. [38]

    Singh, Q

    A. Singh, Q. Li, S. Liu, Y. Yu, X. Lu, C. Schneider, S. H¨ ofling, J. Lawall, V. Verma, R. Mirin, S. W. Nam, J. Liu, and K. Srinivasan, Quantum frequency conversion of a quantum dot single-photon source on a nanophotonic chip, Optica 6, 563 (2019)

    2019

  31. [39]

    Eckstein, B

    A. Eckstein, B. Brecht, and C. Silberhorn, A quantum pulse gate based on spectrally engi- neered sum frequency generation, Opt. Express 19, 13770 (2011)

    2011

  32. [40]

    Brecht, A

    B. Brecht, A. Eckstein, A. Christ, H. Suche, and C. Silberhorn, From quantum pulse gate to quantum pulse shaper—engineered frequency conversion in nonlinear optical waveguides, New Journal of Physics 13, 065029 (2011)

    2011

  33. [41]

    Brecht, A

    B. Brecht, A. Eckstein, R. Ricken, V. Quiring, H. Suche, L. Sansoni, and C. Silberhorn, Demonstration of coherent time-frequency schmidt mode selection using dispersion-engineered frequency conversion, Phys. Rev. A 90, 030302 (2014)

    2014

  34. [42]

    Brecht, D

    B. Brecht, D. V. Reddy, C. Silberhorn, and M. G. Raymer, Photon temporal modes: A complete framework for quantum information science, Phys. Rev. X 5, 041017 (2015)

    2015

  35. [43]

    W. P. Grice and I. A. Walmsley, Spectral information and distinguishability in type-ii down- conversion with a broadband pump, Phys. Rev. A 56, 1627 (1997)

    1997

  36. [44]

    Quesada and J

    N. Quesada and J. Sipe, Effects of time ordering in quantum nonlinear optics, Physical Review A 90, 063840 (2014)

    2014

  37. [45]

    Manzoni and G

    C. Manzoni and G. Cerullo, Design criteria for ultrafast optical parametric amplifiers, Journal of Optics 18, 103501 (2016)

    2016

  38. [46]

    Graffitti, J

    F. Graffitti, J. Kelly-Massicotte, A. Fedrizzi, and A. M. Bra´ nczyk, Design considerations for high-purity heralded single-photon sources, Phys. Rev. A 98, 053811 (2018)

    2018

  39. [47]

    C. K. Law, I. A. Walmsley, and J. H. Eberly, Continuous frequency entanglement: Effective finite Hilbert space and entropy control, Phys. Rev. Lett. 84, 5304 (2000)

    2000

  40. [48]

    Parker, S

    S. Parker, S. Bose, and M. B. Plenio, Entanglement quantification and purification in continuous-variable systems, Phys. Rev. A 61, 032305 (2000)

    2000

  41. [49]

    C. K. Law and J. H. Eberly, Analysis and interpretation of high transverse entanglement in optical parametric down conversion, Phys. Rev. Lett. 92, 127903 (2004). Approved for Public Release; Distribution Unlimited: PA#: AFRL-2024-6366 24

    2004

  42. [50]

    J. S. Pelc, L. Ma, C. Phillips, Q. Zhang, C. Langrock, O. Slattery, X. Tang, and M. M. Fejer, Long-wavelength-pumped upconversion single-photon detector at 1550 nm: performance and noise analysis, Optics express 19, 21445 (2011)

    2011

  43. [51]

    or bulk devices with resonant enhancement [52]. We emphasize that this conversion method homogenizes the spectra of quantum emitters erasing their inherent spectral distinguishability without a priori knowledge of their carrier frequency within the homogenization bandwidth nor...

    2024

  44. [52]

    Esfandyarpour, C

    V. Esfandyarpour, C. Langrock, and M. Fejer, Cascaded downconversion interface to convert single-photon-level signals at 650 nm to the telecom band, Optics Letters 43, 5655 (2018)

    2018

  45. [53]

    J. F. Geus, F. Elsen, S. Nyga, A. J. Stolk, K. L. van der Enden, E. J. van Zwet, C. Haefner, R. Hanson, and B. Jungbluth, Low-noise short-wavelength pumped frequency downconversion for quantum frequency converters, Optica Quantum 2, 189 (2024)

    2024

  46. [54]

    Schneeloch, S

    J. Schneeloch, S. H. Knarr, D. F. Bogorin, M. L. Levangie, C. C. Tison, R. Frank, G. A. Howland, M. L. Fanto, and P. M. Alsing, Introduction to the absolute brightness and number statistics in spontaneous parametric down-conversion, Journal of Optics 21, 043501 (2019)

    2019

  47. [55]

    Tamoˇ sauskas, G

    G. Tamoˇ sauskas, G. Beresneviˇ cius, D. Gadonas, and A. Dubietis, Transmittance and phase matching of BBO crystal in the 3–5 µm range and its application for the characterization of mid-infrared laser pulses, Opt. Mater. Express 8, 1410 (2018)

    2018

  48. [56]

    Kato, Second-harmonic generation to 2048 ˚A in β-Ba2O4, IEEE J

    K. Kato, Second-harmonic generation to 2048 ˚A in β-Ba2O4, IEEE J. Quantum Electron. 22, 1013 (1986)

    1986

  49. [57]

    Umemura, K

    N. Umemura, K. Miyata, and K. Kato, New data on the optical properties of BiB 3O6, Opt. Mater. 30, 532 (2007)

    2007

  50. [58]

    Kato, Temperature-tuned 90 ◦ phase-matching properties of LiB 3O5, IEEE J

    K. Kato, Temperature-tuned 90 ◦ phase-matching properties of LiB 3O5, IEEE J. Quantum Electron. 30, 2950 (1994)

    1994

  51. [59]

    Kato, High-power difference-frequency generation at 4.4–5.7 µm in LiIO 3, IEEE J

    K. Kato, High-power difference-frequency generation at 4.4–5.7 µm in LiIO 3, IEEE J. Quan- tum Electron. 21, 119 (1985)

    1985

  52. [60]

    Kato and E

    K. Kato and E. Takaoka, Sellmeier and thermo-optic dispersion formulas for KTP, Appl. Opt. 41, 5040 (2002)

    2002

  53. [61]

    D. E. Zelmon, D. L. Small, and D. Jundt, Infrared corrected Sellmeier coefficients for congru- ently grown lithium niobate and 5 mol. % magnesium oxide-doped niobate, J. Opt. Soc. Am. B 14, 3319 (1997). Approved for Public Release; Distribution Unlimited: PA#: AFRL-2024-6366

    1997

Pith tools

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