Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M42: Quantum Heat EnginesInvited Live Streamed
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Sponsoring Units: GSNP Chair: Obinna Abah Room: McCormick Place W-375A |
Wednesday, March 16, 2022 8:00AM - 8:36AM |
M42.00001: Can thermodynamics and quantum mechanics be bridged in heat machines? Invited Speaker: Gershon Kurizki In recent years we have examined a variety of quantum mechanical mechanisms that may boost the performance of heat machines (HM) based on simple designs: working-media (WM) of qubits coupled to thermal or squeezed baths and a quantized harmonic-oscillator piston [1-4]. Cooperative (superradiant) effects in multi-qubit WM have been found to boost the HM power[4] but they may have a classical counterpart. We have found uniquely quantum boost (advantage) only when quantum electrodynamics affects the system-bath coupling[5,6]. Yet all existing HM, including the ones examined by us, are essentially dissipative open systems, so that their thermodynamic description disqualifies them from being genuinely quantum mechanical devices. We have now broken away from this established thermodynamic paradigm by putting forth a fundamentally novel HM: Few-mode nonlinear interferometers wherein cold field modes passively “measure” hot modes and thereby enable autonomous HM operation[7], unlike HM based on active measurements and feedforward of this information[8]. Our novel nonlinear-dynamic mechanism replaces dissipative thermal- bath effects by purely coherent evolution and thus constitutes a stepping stone towards bridging quantum mechanics and thermodynamics. |
Wednesday, March 16, 2022 8:36AM - 9:12AM |
M42.00002: Collective effects and enhanced performances of quantum heat engines Invited Speaker: Rosario Fazio Recent predictions for quantum-mechanical enhancements in the operation of small heat engines have |
Wednesday, March 16, 2022 9:12AM - 9:48AM |
M42.00003: Accessing thermodynamic quantities at the nanoscale Invited Speaker: Natalia Ares The development of quantum devices that can be controlled with great speed and precision has presented us with the opportunity to probe thermodynamics processes at the nanoscale. We were able to estimate the thermodynamic cost of timekeeping by measuring the motion of a nanometer-thick membrane excited by electrical noise. We find that the accuracy of our clock and the entropy produced by it are proportional, as predicted both for classical and quantum regimes. |
Wednesday, March 16, 2022 9:48AM - 10:24AM |
M42.00004: Energetics of the driving field during a single qubit gate Invited Speaker: Benjamin Huard Qubits are physical, a quantum gate thus not only acts on the information carried by the qubit but also on its energy. What is then the corresponding flow of energy between the qubit and the controller that implements the gate? Here we exploit a superconducting platform to answer this question in the case of a quantum gate realized by a resonant drive field. During the gate, the superconducting qubit becomes entangled with the microwave drive pulse so that there is a quantum superposition between energy flows. We measure the energy change in the drive field conditioned on the outcome of a projective qubit measurement. We demonstrate that the drive's energy change associated with the measurement backaction can exceed by far the energy that can be extracted by the qubit. This can be understood by considering the qubit as a weak measurement apparatus of the driving field. |
Wednesday, March 16, 2022 10:24AM - 11:00AM |
M42.00005: A single-atom quantum heat engine driven by atomic collisions Invited Speaker: Artur Widera Recent advances in controlling nanoscopic objects suggest the realization of machines exploiting quantum properties. However, the increasing importance of fluctuations in quantum systems calls into question whether such devices can combine high efficiency, high output power, and small power fluctuations. |
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