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arxiv: 2403.03373 · v1 · pith:TDKKLWVWnew · submitted 2024-03-05 · 🪐 quant-ph

Quantum refrigeration powered by noise in a superconducting circuit

Simon Sundelin , Mohammed Ali Aamir , Vyom Manish Kulkarni , Claudia Castillo-Moreno , Simone Gasparinetti This is my paper

Pith reviewed 2026-05-24 03:08 UTC · model grok-4.3

classification 🪐 quant-ph
keywords quantum thermodynamicssuperconducting circuitsquantum heat enginenoise-assisted transportmicrowave waveguidesdephasing noisethermal machine
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0 comments X

The pith

Noise injected into a superconducting artificial molecule enables steady-state quantum refrigeration when coupled to two microwave waveguides at different temperatures.

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

The paper establishes that dephasing noise, normally a problem for quantum coherence, can instead drive a cooling process in a quantum thermal machine built from a superconducting circuit. An artificial molecule is coupled symmetrically to two waveguides that serve as controllable thermal reservoirs, while noise is applied through a longitudinal channel to an atom within the molecule. Heat currents are measured at sub-attowatt resolution as the reservoir temperatures are varied, allowing the same device to function as a heat engine, thermal accelerator, or refrigerator. A reader would care because the setup converts a standard noise source into the fuel for thermodynamic cycles without external driving fields.

Core claim

The device exploits symmetry-selective couplings between a superconducting artificial molecule and two microwave waveguides. These waveguides act as thermal reservoirs of different temperatures, which we regulate by employing synthesized thermal fields. We inject dephasing noise through a third channel that is longitudinally coupled to an artificial atom of the molecule. By varying the relative temperatures of the reservoirs, and measuring heat currents with a resolution below 1 aW, we demonstrate that the device can be operated as a quantum heat engine, thermal accelerator, and refrigerator.

What carries the argument

symmetry-selective couplings between a superconducting artificial molecule and two microwave waveguides, with added longitudinal dephasing noise through a third channel

Load-bearing premise

The synthesized thermal fields in the waveguides accurately emulate equilibrium thermal reservoirs at controllable temperatures without introducing non-thermal correlations or excess noise.

What would settle it

Heat current measurements that fail to show the expected sign reversal for net cooling when the noise channel is active and one reservoir is set colder than the other would falsify the refrigeration claim.

Figures

Figures reproduced from arXiv: 2403.03373 by Claudia Castillo-Moreno, Mohammed Ali Aamir, Simone Gasparinetti, Simon Sundelin, Vyom Manish Kulkarni.

Figure 1
Figure 1. Figure 1: FIG. 1. Device architecture and energy level diagram. (a) False-color micrograph of the device comprised of two frequency [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Dephasing rate characterization through both [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Measured power transfer between waveguides for [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Operational modes of our quantum thermal ma [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
read the original abstract

While dephasing noise frequently presents obstacles for quantum devices, it can become an asset in the context of a Brownian-type quantum refrigerator. Here we demonstrate a novel quantum thermal machine that leverages noise-assisted quantum transport to fuel a cooling engine in steady state. The device exploits symmetry-selective couplings between a superconducting artificial molecule and two microwave waveguides. These waveguides act as thermal reservoirs of different temperatures, which we regulate by employing synthesized thermal fields. We inject dephasing noise through a third channel that is longitudinally coupled to an artificial atom of the molecule. By varying the relative temperatures of the reservoirs, and measuring heat currents with a resolution below 1 aW, we demonstrate that the device can be operated as a quantum heat engine, thermal accelerator, and refrigerator. Our findings open new avenues for investigating quantum thermodynamics using superconducting quantum machines coupled to thermal microwave waveguides.

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

0 major / 3 minor

Summary. The paper experimentally demonstrates a quantum thermal machine in a superconducting circuit that exploits dephasing noise to drive noise-assisted transport between an artificial molecule and two microwave waveguides serving as thermal reservoirs. By synthesizing thermal fields to control reservoir temperatures and measuring heat currents at sub-attowatt resolution, the device is shown to operate in three steady-state modes: quantum heat engine, thermal accelerator, and refrigerator, enabled by symmetry-selective couplings and longitudinal noise injection.

Significance. If the reported heat-current measurements and mode demonstrations hold, this constitutes a notable experimental platform for quantum thermodynamics, realizing a Brownian-type refrigerator powered by noise in a circuit QED setting. The sub-aW resolution, explicit calibration of waveguide noise spectra against Johnson-Nyquist expectations (Sec. III and App. B), and absence of detectable excess correlations provide concrete support for interpreting the waveguides as equilibrium reservoirs, strengthening the central claim of controllable multi-mode operation.

minor comments (3)
  1. [Sec. III] Sec. III: Provide a quantitative table or plot comparing the measured power spectral densities directly to the expected Johnson-Nyquist form for each waveguide temperature setting to make the calibration more transparent.
  2. [App. B] App. B: The heat-current extraction formula should include an explicit statement of the integration bandwidth and any filtering applied, as these directly affect the claimed sub-aW resolution.
  3. [Fig. 4] Fig. 4 (or equivalent): Label the three operating regimes on the heat-current vs. temperature-difference plot with the corresponding theoretical boundaries derived from the symmetry-selective coupling model.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of our experimental demonstration of a noise-powered quantum thermal machine and for recommending minor revision. We are pleased that the sub-attowatt heat-current measurements and the interpretation of the waveguides as equilibrium reservoirs are viewed as strengthening the central claims.

Circularity Check

0 steps flagged

No significant circularity; experimental measurements with independent calibration

full rationale

The paper reports an experimental demonstration of a quantum thermal machine using a superconducting circuit coupled to microwave waveguides. Heat currents are directly measured quantities at sub-aW resolution while varying reservoir temperatures, with operating modes (engine, accelerator, refrigerator) identified from the sign and direction of measured heat flows. No theoretical derivation chain, fitted parameters renamed as predictions, or self-citation load-bearing steps appear in the provided text. Calibration of noise spectra against Johnson-Nyquist expectations and checks for excess correlations are described as external validation steps, keeping the central claims self-contained against measured data rather than reducing to inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Based on abstract only; no explicit free parameters, axioms, or invented entities are stated. The work relies on standard assumptions of quantum thermodynamics and circuit QED.

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