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REVIEW 2 major objections 8 minor 52 references

A fluorescent-protein spin qubit

T0 review · 2 major / 8 minor · reviewed 2026-08-12 · deepseek-v4-flash

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Pith's one-line read A fluorescent protein can act as an optically addressable spin qubit, with a 912-nanometer pulse enabling spin readout at up to 44 percent contrast.

desk verdict A genuine first step: coherent, optically read spin control in a fluorescent protein, with a readout mechanism that needs direct proof but whose empirical core is credible. read the letter →

arxiv 2411.16835 v2 pith:O5BOTVXX submitted 2024-11-25 quant-ph physics.bio-phphysics.chem-ph

Jacob S. Feder , Benjamin S. Soloway , Shreya Verma , Zhi Z. Geng , Shihao Wang , Bethel Kifle , Emmeline G. Riendeau , Yeghishe Tsaturyan
show 7 more authors
Leah R. Weiss Mouzhe Xie Jun Huang Aaron Esser-Kahn Laura Gagliardi David D. Awschalom Peter C. Maurer
This is my paper · ORCID
classification quant-phphysics.bio-phphysics.chem-ph
keywords fluorescentproteinspinqubitopticallydetectedmagneticresonanceactivateddelayedfluorescenceEYFPquantumsensingtripletstatemolecular
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

This paper reports that Enhanced Yellow Fluorescent Protein (EYFP) can serve as an optically addressable spin qubit: its metastable triplet state can be initialized by light, manipulated by microwaves, and read out on demand. The key advantage is that EYFP is a genetically encodable protein, so the qubit can be attached to biological molecules and expressed inside cells, unlike diamond-based nitrogen-vacancy sensors. The authors demonstrate spin contrast up to 44% at liquid-nitrogen temperatures, coherent Rabi oscillations, a coherence time of 16 microseconds under dynamical decoupling, and room-temperature optically detected magnetic resonance in water. If correct, this would give the life sciences a scalable, genetically targetable quantum sensor platform for nanoscale magnetic-field measurements.

What carries the argument

The load-bearing object is the optically activated delayed fluorescence (OADF) readout: a 912 nm pulse transfers the metastable triplet T1 to a higher triplet T2, and spin-dependent reverse intersystem crossing funnels population back to S1, producing a fluorescence photon whose yield depends on the T1 spin sublevel population. This turns the protein's fluorescence into a spin-state meter and makes readout roughly five orders of magnitude faster than waiting for spontaneous triplet decay. The second pillar is the spin-1 Hamiltonian with zero-field splitting parameters D and E, which fits the powder-averaged ODMR spectra and gives the transition frequencies used for coherent control and field sensing.

What would settle it

Run the same ODMR experiment while tuning the 912-nanometer flash across the predicted absorption band of the higher triplet state: the spin contrast should follow the absorption spectrum, and the emitted spectrum should match normal fluorescence. If the contrast persists when the flash is detuned from that band, or appears for molecules lacking the triplet, the spin-selective readout mechanism is wrong.

Watch

Extended reading notes

Core claim

The paper claims to have turned the metastable triplet state of EYFP's chromophore into a working spin-1 qubit. Initialization is by a 488 nm pulse that pumps the molecule into a spin-polarized T1 state via intersystem crossing; a 912 nm pulse then drives T1 to a higher triplet (assigned T2), where spin-dependent reverse intersystem crossing returns population to S1, emitting delayed fluorescence whose intensity reports the spin state. Using this optically activated delayed fluorescence readout, the authors measure ODMR with zero-field splitting parameters D=(2π)×2.356 GHz and E=(2π)×0.458 GHz, see Rabi oscillations, and extract a spin-lattice relaxation time of 141 μs at 80 K and a CPMG coherence time of 16 μs. The same readout works at room temperature in aqueous solution with about 3% contrast, and coherent control is preserved when the protein is expressed in human kidney cells. The central claim is that fluorescent proteins are viable optically addressable spin qubits, opening a genetically encodable sensing platform.

Load-bearing premise

The entire readout depends on the assumption that a 912-nanometer flash takes the protein's long-lived dark state to a higher dark state, and that the return to the bright state is sensitive to the electron-spin orientation, so the flash's emitted light reports the spin.

Editorial extensions

If this is right

  • If the mechanism holds, EYFP and other fluorescent proteins with long-lived triplet states become genetically encodable spin qubits, targetable to specific biomolecules by standard fusion-protein methods.
  • The OADF readout can in principle be applied to any molecule with a singlet-triplet-singlet ladder and suitable reverse intersystem crossing, potentially expanding the family of optically addressable molecular qubits far beyond EYFP.
  • At 80 K the qubit offers an AC magnetic-field sensitivity upper bound of 183 fT mol^{1/2} Hz^{-1/2}; at room temperature the DC upper bound is 93 pT mol^{1/2} Hz^{-1/2}, enough to detect roughly 20 nT fields from proton spins at a distance of 5 nm.
  • The demonstration in mammalian cells indicates that spin and optical control survive the intracellular environment, supporting in-cell sensing applications.
  • Sensitivity could be substantially improved by deuteration, better collection optics, and fluorescence cycling, with at least a 500-fold improvement projected by the authors.

Reading between the lines

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

  • The same readout should work in the many fluorescent proteins and dye molecules that already show optically activated reverse intersystem crossing, potentially making spin sensing a standard feature of fluorescent tags.
  • The sign reversal of spin contrast between 80 K and room temperature suggests the spin selectivity of intersystem crossing and reverse intersystem crossing is temperature dependent; if so, the ratio of ODMR contrasts at two temperatures could serve as a local thermometer or a probe of the chromophore's thermal environment.
  • Because the qubit is genetically encoded, directed evolution could be used to screen protein variants with longer coherence or higher contrast, a route not available for solid-state defects.
  • Single-molecule OADF could be combined with existing super-resolution microscopies to perform spin measurements at the single-protein level; the paper's photon budget implies this is plausible but it is not demonstrated.
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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

2 major / 8 minor

Summary. The manuscript reports the realization of an optically addressable spin qubit in the Enhanced Yellow Fluorescent Protein (EYFP), using a custom confocal microscope with microwave driving and a proposed optically activated delayed fluorescence (OADF) readout. The authors initialize the triplet spin via 488 nm excitation, drive spin transitions with microwaves, and read out the spin state by a 912 nm pulse that populates a higher triplet and leads to delayed fluorescence. They report ODMR spectra at 80 K, fit zero-field splitting parameters D = (2π)×(2.356±0.004) GHz and E = (2π)×(0.458±0.003) GHz, and show that the model extrapolates successfully to 34.1 mT. They demonstrate Rabi oscillations, Hahn-echo coherence (T2 ≈ 1.5 μs at zero field), CPMG-extended coherence (16 μs at 80 K), spin-lattice relaxation T1 = (141±5) μs at 80 K, room-temperature ODMR in aqueous solution with ~3% contrast and a DC sensitivity estimate, and coherent control in HEK 293T cells at 175 K. The paper also presents TDDFT calculations supporting the triplet assignment and the T1–T2 optical transition.

Significance. If the central claims hold, this is a significant advance: a genetically encodable, water-soluble molecular spin qubit with optical initialization and readout, coherent microwave control, and demonstrated operation in biological cells. The strengths include the internally consistent ODMR data, the successful extrapolation of the spin Hamiltonian model to higher field, the direct observation of coherent Rabi oscillations, and the explicit use of dynamical decoupling. The sensitivity values are clearly labeled as upper-bound estimates rather than measured sensitivities, which is appropriate. The main limitation is that the proposed spin-selective OADF mechanism is not directly demonstrated, and this mechanism is presented as a key novelty of the work.

major comments (2)
  1. [Protein qubit and spin readout; Fig. 1c] The OADF readout mechanism is presented as established: the 912 nm pulse drives population from T1 to T2, and spin-dependent reverse intersystem crossing (RISC) to the singlet manifold makes the delayed fluorescence intensity a proxy for the T1 spin state. However, no direct measurement is shown that either the T1–T2 population transfer or the RISC yield is spin-selective. The observed microwave-dependent OADF contrast (Fig. 1e) demonstrates that the detected fluorescence is sensitive to the spin state, but it does not identify which step in the optical cycle provides that sensitivity; it could equally arise from spin-dependent intersystem crossing during 488 nm initialization or from spin-dependent T1 decay, with the 912 nm pulse merely accelerating triplet decay. To support the claimed "novel spin-readout technique" and the specific model in Fig. 1c, the authors should report a control with the 912 nm pulse detuned from the proposed T1–T2 resonance (or a wavelength-dependence scan), and ideally a non-optical verification of spin polarization (e.g., time-resolved EPR) before and after the 912 nm pulse. Without such evidence, the mechanistic claim in Fig. 1c is an overinterpretation of the data, even if the empirical spin readout is real.
  2. [Operation at room temperature; Fig. 4] The room-temperature ODMR contrast is reported with a sign reversal relative to 80 K, and the text attributes this to temperature-dependent spin-dependence of the ISC and/or RISC rates, followed by the statement that the magnetic origin is confirmed by the field-dependence data. While the field dependence does confirm a magnetic resonance, the sign change is left unexplained and the proposed temperature dependence is speculative. Because room-temperature operation is a headline result of the abstract, the authors should either provide additional characterization (e.g., temperature dependence of the OADF contrast or a quantitative model) or explicitly state that the mechanism of the room-temperature contrast is not yet understood. As written, the text overstates the certainty of the physical picture.
minor comments (8)
  1. [Abstract; Operation at room temperature; Discussion and outlook] The DC sensitivity is quoted as 93 pT mol^{1/2} Hz^{-1/2} in the abstract and Discussion, but the main text (Operation at room temperature) reports a DC sensitivity of 98 pT mol^{1/2} Hz^{-1/2} from the measurement; these numbers should be reconciled.
  2. [Protein qubit and spin readout] The phrase "background-free delayed fluorescence photon" is ambiguous: the delayed fluorescence is detected after the 912 nm pulse with gated detection, but the 488 nm excitation may produce residual fluorescence; please clarify what "background-free" means in the measurement sequence.
  3. [Protein qubit and spin readout] The statement that OADF readout is "approximately five orders of magnitude faster than via the metastable triplet decay" is not quantitatively defined; if it refers to the readout time, a typical triplet lifetime of milliseconds would imply a readout time of tens of nanoseconds, which is inconsistent with the fluorescence lifetime; specify the comparison.
  4. [Fig. 2 caption and accompanying text] The simulation in Fig. 2b sets the T_x–T_y transition amplitude to zero; a justification for this choice (e.g., selection rules or orientation averaging) should be provided in the text or Methods.
  5. [Optically-detected magnetic resonance] The faint resonance at approximately 0.9 GHz is attributed to microwave harmonics, but it is also close to 2E = 0.916 GHz; please clarify the assignment and rule out the T_x–T_y transition at that frequency.
  6. [Qubit coherence; Eq. (2) and Fig. 3d] The T1 fit with 1/T1 = A T + B T^7 gives small reported errors on A and B, but the text acknowledges that unambiguous identification of the relaxation mechanisms requires further investigation; showing residuals or a comparison with single-power-law fits would prevent the false impression that the two processes are cleanly separated.
  7. [Qubit coherence] The formula for the effective gyromagnetic ratio γ_eff used to explain the Hahn-echo scaling is stated without derivation; a brief derivation or a reference would help readers assess the validity of the clock-transition model.
  8. [Qubit sensor expressed in mammalian cells] The in-cell demonstration is performed at 175 K, not at room temperature; the text should be explicit that the in-cell coherent control is at cryogenic temperatures, as the abstract could be read as implying ambient conditions.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the spin-qubit claims rest on direct ODMR, Rabi, and coherence measurements, and the fitted ZFS parameters are independently validated against a higher-field spectrum.

full rationale

The derivation chain is self-contained rather than circular. The zero-field splitting parameters D and E are explicitly fitted to low-field ODMR data and then used to simulate powder-averaged spectra; the agreement at 34.1 mT is an independent extrapolation rather than a re-use of the fitted points, as the paper states: 'Using the fitted D and E parameters, we calculate the expected spectra of the powder-averaged transition frequencies as a function of magnetic field... It also extrapolates well to higher fields exemplified at 34.1 mT.' The Rabi oscillations, Hahn-echo and CPMG coherence curves, T1 relaxation decays, and room-temperature ODMR traces are direct measurements; the field-dependent dephasing model follows from the standard spin-1 Hamiltonian and is compared to data rather than fitted as a prediction of itself. The T1(T) model is admittedly phenomenological, with the paper noting that 'unambiguous identification of the exact relaxation mechanisms will require a more thorough investigation.' The sensitivity bounds are estimates derived from measured T2, contrast, and transition rates, so they are figure-of-merit calculations rather than fitted inputs relabeled as predictions. The OADF readout mechanism is an interpretation supported by external literature and TDDFT, not by a self-citation chain; even if the microscopic T2 assignment were incorrect, the observed spin-dependent photoluminescence contrast and coherent microwave control would remain empirical facts. Self-citations appear only in background references and are not load-bearing: the clock-transition scaling and spin-coherence concepts are standard and independently stated. No equation or fitted parameter is defined in terms of the result it is claimed to predict, so no circular step is present.

Assumptions & free parameters 3 free parameters · 6 assumptions · 0 invented entities

The central claim rests on the standard spin-1 Hamiltonian, a powder-average assumption, the OADF mechanism (T1 to T2 by 912 nm, spin-dependent RISC), and computational TDDFT assignments. The fitted D, E, A, and B parameters are measured from data and used for simulation or extrapolation, not to define the existence of the qubit. No new particles, forces, or entities are proposed.

free parameters (3)
  • Zero-field splitting parameter D = (2π)×2.356±0.004 GHz
    Extracted from low-field ODMR powder spectra. Used with E to simulate the field-dependent ODMR spectrum; the model is then tested at 34.1 mT.
  • Zero-field splitting parameter E = (2π)×0.458±0.003 GHz
    Extracted from low-field ODMR powder spectra. Together with D it defines the spin Hamiltonian used for all ODMR simulations.
  • T1 relaxation model amplitudes A and B = A=(43±8) K^-1 s^-1, B=(47±7)×10^-12 K^-7 s^-1
    Fitted to the temperature dependence of 1/T1 = A T + B T^7. The authors explicitly note that unambiguous identification of the relaxation mechanisms requires further investigation.
assumptions (6)
  • standard math The triplet spin is described by Eq. 1: H = ℏD(Sz^2 - 2/3) + ℏE(Sx^2 - Sy^2) - ℏγ_el S·B
    Standard spin-1 zero-field splitting Hamiltonian with electronic gyromagnetic ratio, used for all ODMR simulations.
  • domain assumption Randomly oriented EYFP molecules produce a powder-averaged ODMR spectrum
    Needed to interpret ensemble measurements; D and E are extracted from the low-field powder spectrum.
  • domain assumption A 912 nm pulse transfers T1 to T2 and accelerates spin-dependent reverse intersystem crossing to S1
    Core OADF readout mechanism. Supported by TDDFT and delayed fluorescence spectral match, but not directly proven by a spin-selective optical experiment alone.
  • domain assumption Spin-lattice relaxation rate follows 1/T1 = A T + B T^7
    Direct and Raman phonon process model from EPR literature. Authors flag the fit as provisional pending more investigation.
  • domain assumption Dephasing near the clock transition is dominated by magnetic noise with 1/T2 proportional to gamma_eff
    Theoretical model shown in Fig. 3b inset; matches the measured Hahn-echo dephasing rate as a function of field.
  • domain assumption TDDFT with B3LYP and ωB97X-D3 predicts T1/T2 transitions, spin density, and zero-field splitting parameters
    Computational identification used to assign the T2 state and to support the D/E values; not independently verified by EPR in this paper.

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Pith. "Pith review of A fluorescent-protein spin qubit." pith.science (2026). https://pith.science/paper/O5BOTVXX

@misc{pith2026241116835,
  author       = {Pith},
  title        = {Pith review of: A fluorescent-protein spin qubit},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/O5BOTVXX}},
  note         = {Machine review of arXiv:2411.16835}
}
abstract

Optically-addressable spin qubits form the foundation of a new generation of emerging nanoscale sensors. The engineering of these sensors has mainly focused on solid-state systems such as the nitrogen-vacancy (NV) center in diamond. However, NVs are restricted in their ability to interface with biomolecules due to their bulky diamond host. Meanwhile, fluorescent proteins have become the gold standard in bioimaging, as they are genetically encodable and easily integrated with biomolecules. While fluorescent proteins have been suggested to possess a metastable triplet state, they have not been investigated as qubit sensors. Here, we realize an optically-addressable spin qubit in the Enhanced Yellow Fluorescent Protein (EYFP) enabled by a novel spin-readout technique. A near-infrared laser pulse allows for triggered readout of the triplet state with up to 44% spin contrast. Using coherent microwave control of the EYFP spin at liquid-nitrogen temperatures, we measure a spin-lattice relaxation time of $(141 \pm 5)\, \mathrm{\mu s}$, a $(16 \pm 2)\, \mathrm{\mu s}$ coherence time under Carr-Purcell-Meiboom-Gill (CPMG) decoupling, and a predicted oscillating (AC) magnetic field sensitivity with an upper bound of $183 \, \mathrm{fT}\, \mathrm{mol}^{1/2}\, \mathrm{Hz}^{-1/2}$. We express the qubit in mammalian cells, maintaining contrast and coherent control despite the complex intracellular environment. Finally, we demonstrate optically-detected magnetic resonance at room temperature in aqueous solution with contrast up to 3%, and measure a static (DC) field sensitivity with an upper bound of $93 \, \mathrm{pT}\, \mathrm{mol}^{1/2}\, \mathrm{Hz}^{-1/2}$. Our results establish fluorescent proteins as a powerful new qubit sensor platform and pave the way for applications in the life sciences that are out of reach for solid-state technologies.

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Pith tools

Reviewed August 12, 2026 · model on record in the stance chip above.