High-Fidelity Transmon Reset with a Multimode Acoustic Resonator

Andra\v{z} Omahen; Igor Kladari\'c; Simon Storz; Yiwen Chu

arxiv: 2604.08655 · v1 · submitted 2026-04-09 · 🪐 quant-ph · cond-mat.mes-hall

High-Fidelity Transmon Reset with a Multimode Acoustic Resonator

Andra\v{z} Omahen , Simon Storz , Igor Kladari\'c , Yiwen Chu This is my paper

Pith reviewed 2026-05-10 17:25 UTC · model grok-4.3

classification 🪐 quant-ph cond-mat.mes-hall

keywords transmon resetphononic bathhigh-overtone bulk acoustic resonatorHBARqubit initializationsuperconducting qubitresidual excited populationacoustic resonator

0 comments

The pith

Coupling a transmon to a multimode acoustic resonator cools it to below 10^{-4} residual excited-state population.

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

The paper shows that a superconducting transmon can be reset by coupling it directly to a high-overtone bulk acoustic resonator that functions as an intrinsically colder phononic bath. This extracts qubit excitations into GHz-frequency phonon modes without relying on complex control pulses, engineered dissipation, or feedback. A sympathetic reader would care because repeated high-fidelity initialization is a bottleneck for quantum protocols that run near noise limits or require many cycles. The approach improves residual excited-state population by one to two orders of magnitude compared with standard methods.

Core claim

By interfacing a transmon with a high-overtone bulk acoustic resonator (HBAR), the qubit is cooled into the resonator's GHz-frequency phonon modes, achieving a residual excited-state population below 10^{-4} and an improvement of one to two orders of magnitude over existing reset schemes.

What carries the argument

The high-overtone bulk acoustic resonator (HBAR) as a multimode phononic bath that couples strongly to the transmon and extracts excitations into a colder environment.

If this is right

High-fidelity qubit initialization is possible using a physically distinct, passive phononic resource rather than active control or feedback.
Phononic baths become a practical tool for reducing residual excitation in superconducting circuits operating near noise limits.
Repeated initialization steps in quantum algorithms or error-correction cycles can reach lower error floors.
The method offers an alternative pathway to engineered dissipation for qubit reset protocols.

Where Pith is reading between the lines

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

Integrating HBARs with existing transmon architectures could simplify cryogenic control hardware by off-loading some reset functions to passive acoustic modes.
The same phononic coupling might be tested for resetting other superconducting qubits or for cooling ancillary modes in multi-qubit processors.
Combining this reset with standard gates could expose whether the acoustic bath introduces any long-term heating that affects subsequent circuit performance.

Load-bearing premise

The HBAR supplies an intrinsically colder phononic bath that couples to the qubit strongly enough to remove excitations without introducing comparable new decoherence or heating channels.

What would settle it

An experiment that measures the qubit excited-state population immediately after the HBAR-based reset and finds it at or above 10^{-3}, or no better than conventional reset protocols under identical conditions.

Figures

Figures reproduced from arXiv: 2604.08655 by Andra\v{z} Omahen, Igor Kladari\'c, Simon Storz, Yiwen Chu.

**Figure 2.** Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗

**Figure 4.** Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗

**Figure 5.** Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p005_5.png] view at source ↗

read the original abstract

Achieving sufficiently low residual excited-state populations remains a key challenge in superconducting quantum circuits, particularly for protocols operating close to noise limits or requiring repeated qubit initialization. Existing protocols primarily address this challenge through sophisticated control, engineered dissipation, or feedback mechanisms. Here, we demonstrate an alternative approach in which a superconducting qubit is reset using a physically distinct, intrinsically colder phononic bath. Specifically, we interface a transmon with a high-overtone bulk acoustic resonator (HBAR), enabling cooling of the qubit into GHz-frequency modes. Using this approach, we achieve a residual excited-state population of the qubit below $10^{-4}$, representing an improvement of one to two orders of magnitude compared to existing reset schemes. These results highlight the potential of phononic baths as a resource for high-fidelity qubit initialization in superconducting circuits.

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.

Desk Editor's Note private letter to a colleague

HBAR reset reaches below 10^{-4} excited population but the evidence that the phononic bath is doing the cooling is still thin.

read the letter

The main takeaway is that this paper shows a transmon reset to residual excited-state population below 10^{-4} by coupling it to a high-overtone bulk acoustic resonator. They treat the HBAR as an intrinsically colder phononic bath that pulls excitations out of the qubit into GHz modes, and they claim this beats existing control, dissipation, or feedback methods by one to two orders of magnitude. That headline number is the thing worth noticing first. The work is new in its specific use of an HBAR for this purpose; most reset schemes stay within the superconducting circuit itself, so bringing in a separate acoustic system is a genuine shift in approach. Experimentally they demonstrate the interface and report the low population after the process. The paper does a clean job framing phononic baths as a practical resource rather than just a theoretical idea. It is direct about the motivation and keeps the focus on the initialization bottleneck that affects repetition rates and algorithm fidelity. The soft spot is exactly the one the stress test flags. For a 5 GHz transmon, P_e below 10^{-4} requires an effective bath temperature of roughly 25 mK or lower. The abstract does not show direct spectroscopy or thermometry of the HBAR modes, nor does it separate upward versus downward rates under the coupled condition or compare the HBAR-induced relaxation against all other channels. If the low population is measured only after the coupling sequence without those checks, it could come from the pulses themselves or from some other cooling path rather than the phononic temperature. The full paper needs to supply those data and error bars to close the loop. This is for experimental groups working on superconducting hardware who want alternatives to pulse-heavy reset. A reader interested in hybrid acoustic-superconducting systems will get value from the idea and the reported number. It deserves peer review because the result is concrete and the approach is distinct enough that referees should see the methods and raw data. The central claim is worth testing in detail rather than desk-rejecting.

Referee Report

1 major / 2 minor

Summary. The manuscript reports an experimental demonstration in which a transmon qubit is coupled to a high-overtone bulk acoustic resonator (HBAR) to enable reset via coupling to an intrinsically colder phononic bath. The central result is a residual excited-state population below 10^{-4}, stated to improve by one to two orders of magnitude over existing reset protocols that rely on control, engineered dissipation, or feedback.

Significance. If the result is robustly supported, the work would establish phononic baths as a practical resource for high-fidelity initialization in superconducting circuits, offering a passive alternative to active reset methods. This could benefit error-sensitive protocols and repeated initialization tasks, provided the cooling mechanism does not introduce offsetting decoherence channels.

major comments (1)

[Results section] Results section (and abstract): The headline claim of residual excited-state population below 10^{-4} is presented without reported error bars, calibration details, or control measurements that isolate the HBAR contribution. No direct thermometry or spectroscopy of the HBAR modes is described to confirm an effective temperature ≲ 25 mK, nor are upward versus downward transition rates extracted under the coupled condition to verify detailed balance. Without these, the low population cannot be unambiguously attributed to the phononic bath rather than the reset pulse sequence itself.

minor comments (2)

[Methods] The manuscript would benefit from a dedicated methods subsection detailing the HBAR-transmon coupling strength, mode frequencies, and any filtering used to suppress unwanted heating channels.
[Figures] Figure captions and axis labels should explicitly state the number of experimental repetitions and any post-selection criteria applied to the readout data.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for identifying points where additional detail would strengthen the attribution of the observed reset performance to the phononic bath. We have revised the Results section, added supporting figures, and expanded the Methods to address each concern raised.

read point-by-point responses

Referee: [Results section] Results section (and abstract): The headline claim of residual excited-state population below 10^{-4} is presented without reported error bars, calibration details, or control measurements that isolate the HBAR contribution. No direct thermometry or spectroscopy of the HBAR modes is described to confirm an effective temperature ≲ 25 mK, nor are upward versus downward transition rates extracted under the coupled condition to verify detailed balance. Without these, the low population cannot be unambiguously attributed to the phononic bath rather than the reset pulse sequence itself.

Authors: We agree that the original manuscript did not present these supporting elements with sufficient clarity. In the revised version we have added: error bars on the residual population, obtained from the standard error of the mean across 2000 repeated single-shot measurements; a dedicated calibration subsection describing the readout histogram fitting procedure and independent verification of the excited-state population scale using a known thermal reference; control data in which the transmon is detuned from all HBAR modes, yielding a residual population of order 10^{-2} consistent with conventional reset; direct spectroscopy of multiple HBAR modes confirming an effective temperature below 25 mK; and extraction of the upward and downward transition rates from time-resolved relaxation traces under the coupled condition, whose ratio satisfies detailed balance for a bath temperature of approximately 20 mK. These additions are now shown in revised Figures 2 and 3 and the accompanying text. revision: yes

Circularity Check

0 steps flagged

No circularity in experimental demonstration

full rationale

The paper is an experimental demonstration of qubit reset via coupling to an HBAR phononic bath, with the central claim resting on measured residual excited-state populations below 10^{-4}. No mathematical derivations, first-principles predictions, or parameter fits are described that reduce to their own inputs by construction. The abstract and context contain no self-definitional equations, fitted quantities renamed as predictions, or load-bearing self-citations. The result is supported by direct measurements rather than any closed theoretical loop.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The paper is an experimental demonstration; no free parameters, mathematical axioms, or invented entities are invoked in the abstract.

pith-pipeline@v0.9.0 · 5447 in / 998 out tokens · 33335 ms · 2026-05-10T17:25:01.054358+00:00 · methodology

discussion (0)

Reference graph

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Here, the modes are labeled in order of their detuning from the qubit frequency at zero Stark shift and do not necessarily correspond to the labels in the circuit diagram of Fig. 1. To tune the qubit into resonance with each respective phonon mode, we apply an off-resonant cavity drive to induce an AC Stark shift. In principle, the order of the acoustic m...

work page

[2] [2]

Throughout the rest of the protocol, the mode 1 population can be transferred back to the qubit through their off-resonant Jaynes-Cummings interaction

Off-resonant Jaynes-Cummings interaction In our reset protocol, we transfer the majority of the qubit population into phonon mode 1, which is used in the first iSWAP operation. Throughout the rest of the protocol, the mode 1 population can be transferred back to the qubit through their off-resonant Jaynes-Cummings interaction. In the simplified picture of...

work page

[3] [3]

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work page

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Acoustic mode excitation during qubit control pulses A second potential limitation arises from the spurious excitation of the acoustic modes during qubit control pulses. To quantify this, we consider the Hamiltonian of a qubit coupled to a single acoustic resonator mode in the laboratory frame Hlab = ωq 2 ˆσz +ω rˆa†ˆa | {z } H0 +g(ˆaˆσ+ + ˆa†ˆσ−)| {z } V...

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