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arxiv: 2603.06848 · v2 · submitted 2026-03-06 · 🪐 quant-ph

Qubit Noise Sensing via Induced Photon Loss in a Superconducting Cavity

Nitzan Kahn , Dror Garti , Uri Goldblatt , Lalit M. Joshi , Fabien Lafont , Serge Rosenblum This is my paper

Pith reviewed 2026-05-15 14:35 UTC · model grok-4.3

classification 🪐 quant-ph
keywords superconducting qubitsfrequency noisephoton lossnoise spectroscopycavity QEDmid-circuit measurementpost-selection
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The pith

Qubit frequency noise converts into measurable photon loss inside a coupled high-Q superconducting cavity.

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

The paper shows a protocol that senses qubit frequency noise without driving the qubit as the direct probe. Frequency fluctuations are transduced into extra photon loss in the cavity through their coupling, and repeated mid-circuit qubit measurements plus post-selection separate this loss from ordinary cavity decay. Experiments confirm the loss grows with deliberately injected noise strength. Absent any added noise, the method yields an upper bound of 5×10³ Hz²/Hz on the noise power spectral density at 508 MHz. The approach therefore reaches spectral windows beyond those accessible to conventional qubit-based noise spectroscopy.

Core claim

Qubit frequency noise induces additional photon loss in the cavity via their interaction; post-selection on the outcomes of repeated mid-circuit qubit measurements isolates this induced loss from intrinsic cavity decay, directly giving the noise power spectral density at the 508 MHz repetition rate, with an upper bound of 5×10³ Hz²/Hz when no external noise is applied.

What carries the argument

Dispersive coupling that maps qubit frequency fluctuations onto cavity photon loss rate, isolated by post-selection on mid-circuit qubit measurement outcomes.

If this is right

  • Noise spectra become accessible at frequencies higher than those reached by standard qubit-based spectroscopy.
  • Noise characterization becomes possible while the qubit undergoes strong driving.
  • The extracted loss rate scales directly with the amplitude of applied frequency noise.
  • An upper bound of 5×10³ Hz²/Hz is placed on intrinsic qubit frequency-noise power spectral density at 508 MHz.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same transducing mechanism could be applied to monitor noise in real time during quantum algorithm execution.
  • Extension to multi-qubit devices might allow simultaneous sensing across an entire processor using a shared cavity.
  • Analogous loss-conversion protocols could sense other qubit parameters such as coupling-strength fluctuations.

Load-bearing premise

Post-selection on repeated mid-circuit qubit measurements cleanly isolates the noise-induced photon loss from intrinsic cavity decay and from any measurement-induced back-action or additional dephasing.

What would settle it

An experiment in which controlled frequency noise at 508 MHz is applied to the qubit yet the post-selected cavity photon-loss rate shows no corresponding increase.

Figures

Figures reproduced from arXiv: 2603.06848 by Dror Garti, Fabien Lafont, Lalit M. Joshi, Nitzan Kahn, Serge Rosenblum, Uri Goldblatt.

Figure 1
Figure 1. Figure 1: FIG. 1. Detecting transmon frequency noise with a superconducting [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Characterizing the impact of dressed dephasing on the [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Extracted dressed-dephasing rate [PITH_FULL_IMAGE:figures/full_fig_p003_4.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Unconditional (orange) [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
read the original abstract

Characterizing noise in superconducting qubits is essential for improving coherence and gate performance. Conventional noise-sensing methods typically use the qubit itself as the sensor, which limits both accessible bandwidth and applicability during driven operation. Here, we demonstrate a method for measuring qubit frequency noise by converting it into photon loss in a coupled high-Q superconducting cavity. We use repeated mid-circuit qubit measurements with post-selection to separate this induced loss from intrinsic cavity decay. We validate the protocol using injected noise and show that the extracted loss scales as expected with the applied noise strength. Without added noise, we place an upper bound of $5\times10^3\,\mathrm{Hz}^2/\,\mathrm{Hz}$ on the qubit frequency-noise power spectral density at 508 MHz. The protocol opens access to a higher-frequency spectral window than standard qubit-based spectroscopy and may enable noise characterization during strong driving.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript demonstrates an experimental protocol for sensing qubit frequency noise by converting it into excess photon loss in a dispersively coupled high-Q superconducting cavity. Repeated mid-circuit qubit measurements combined with post-selection are used to isolate the noise-induced loss from intrinsic cavity decay. The protocol is validated by injecting controlled noise and confirming that the extracted loss scales as expected with noise strength. In the absence of added noise, an upper bound of 5×10³ Hz²/Hz is placed on the qubit frequency-noise power spectral density at 508 MHz. The work aims to access higher-frequency noise components than conventional qubit-based methods and potentially enable characterization during strong driving.

Significance. If the isolation of noise-induced loss holds, the method provides access to a higher-frequency spectral window (hundreds of MHz) and operation during driven regimes, which would be a useful addition to the toolkit for characterizing and mitigating noise in superconducting qubits. The injected-noise validation demonstrates the expected scaling and supports the underlying dispersive-conversion mechanism.

major comments (2)
  1. [Abstract, protocol section] Abstract and protocol description (mid-circuit measurements + post-selection): the upper bound of 5×10³ Hz²/Hz relies on the assumption that post-selected loss contains no residual contribution from measurement back-action (e.g., Purcell-enhanced decay during readout, finite fidelity leakage, or dispersive photon-number fluctuations). The injected-noise data confirm scaling but do not directly test the zero-noise baseline cleanliness; explicit controls or bounds on these back-action terms are needed to substantiate the reported limit.
  2. [Results (noise-free measurement)] Results section on noise-free bound: quantitative error bars, full data-exclusion criteria, and statistical details on the post-selected photon-loss rate are not provided in the abstract or summary claims, leaving the support for the 5×10³ Hz²/Hz bound provisional despite the scaling validation.
minor comments (2)
  1. [Methods] Clarify the exact dispersive shift value and cavity Q used in the conversion from loss rate to frequency-noise PSD; this would strengthen reproducibility.
  2. [Figures] Figure captions should explicitly state the number of experimental repetitions and any averaging applied to the loss-rate data.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed feedback. The comments highlight important aspects of the protocol validation that we will address in revision to strengthen the presentation of the upper bound and supporting analysis.

read point-by-point responses

  1. Referee: [Abstract, protocol section] Abstract and protocol description (mid-circuit measurements + post-selection): the upper bound of 5×10³ Hz²/Hz relies on the assumption that post-selected loss contains no residual contribution from measurement back-action (e.g., Purcell-enhanced decay during readout, finite fidelity leakage, or dispersive photon-number fluctuations). The injected-noise data confirm scaling but do not directly test the zero-noise baseline cleanliness; explicit controls or bounds on these back-action terms are needed to substantiate the reported limit.

    Authors: We agree that explicit bounds on residual back-action are required to fully substantiate the zero-noise upper limit. The injected-noise scaling validates the dispersive-conversion mechanism but does not independently confirm baseline cleanliness. In the revised manuscript we will add a dedicated subsection with calibration data that places quantitative upper bounds on Purcell-enhanced decay during readout, qubit leakage out of the computational subspace, and dispersive photon-number fluctuations. These bounds will be derived from separate measurements of readout-induced cavity decay and qubit state-preparation fidelity, and will be used to show that their contribution to the post-selected loss rate lies below the reported 5×10³ Hz²/Hz limit. revision: yes

  2. Referee: [Results (noise-free measurement)] Results section on noise-free bound: quantitative error bars, full data-exclusion criteria, and statistical details on the post-selected photon-loss rate are not provided in the abstract or summary claims, leaving the support for the 5×10³ Hz²/Hz bound provisional despite the scaling validation.

    Authors: We acknowledge that the current manuscript presents the upper bound without accompanying statistical details. In the revision we will expand the results section to report (i) error bars on the measured photon-loss rates obtained from the post-selected ensemble, (ii) the full set of data-exclusion criteria (readout fidelity threshold, qubit reset quality, and cavity photon-number stability), and (iii) the number of experimental repetitions together with the statistical procedure used to convert the loss-rate uncertainty into the quoted spectral-density bound. These additions will make the support for the 5×10³ Hz²/Hz limit explicit and reproducible. revision: yes

Circularity Check

0 steps flagged

No derivation chain present; experimental protocol is self-contained

full rationale

The paper reports an experimental measurement of qubit frequency noise via induced cavity photon loss, using mid-circuit measurements and post-selection to isolate the effect, with validation via injected noise. No mathematical derivation, ansatz, or parameter fitting is claimed that reduces by construction to the inputs; the upper bound is obtained directly from calibrated data. No self-citation load-bearing steps or uniqueness theorems appear in the provided text. This is a standard experimental result with external calibration, warranting score 0.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The protocol rests on standard circuit-QED assumptions about dispersive coupling and linear response of cavity decay to frequency fluctuations; no new entities or free parameters are introduced in the abstract.

axioms (2)
  • domain assumption The qubit-cavity interaction remains in the dispersive regime and the induced loss is linearly proportional to frequency-noise power spectral density.
    Implicit in the claim that loss scales as expected with applied noise strength.
  • domain assumption Post-selection on qubit state removes all measurement-induced cavity loss without biasing the noise estimate.
    Required to separate induced loss from intrinsic decay.

pith-pipeline@v0.9.0 · 5461 in / 1327 out tokens · 32018 ms · 2026-05-15T14:35:04.976368+00:00 · methodology

discussion (0)

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