Quantum process inference for a single-qubit Maxwell demon

2021/02/28 by Xingrui Song, Mahdi Naghiloo, Kater Murch
Computer Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Context (archaeology) #Maxwell's demon #Observable #Physics #Quantum #Quantum Information and Cryptography #Quantum dynamics #Quantum information #Quantum many-body systems #Quantum mechanics #Quantum process #Quantum thermodynamics #Qubit #Statistical physics #Theoretical physics #cond-mat.stat-mech #quant-ph

paper · pdf · doi:10.1103/physreva.104.022211

published as Phys. Rev. A 104, 022211 (2021) · 11 pages, 5 figures

openalex created_date 2021/02/15 · arxiv created 2021/06/17 · openalex publication_date 2021/08/20 · arxiv updated 2021/08/25 · openalex updated_date 2026/08/06

Abstract

While quantum measurement theories are built around density matrices and observables, the laws of thermodynamics are based on processes such as the ones used in heat engines and refrigerators. The study of quantum thermodynamics fuses these two distinct paradigms. In this article, we highlight the usage of quantum process matrices as a unified language for describing thermodynamic processes in the quantum regime. We experimentally demonstrate this in the context of a quantum Maxwell demon, where two major quantities are commonly investigated: the average work extraction \ensuremath⟨W\ensuremath⟩ and the efficacy \ensuremathγ, which measures how efficiently the feedback operation uses the obtained information. Using the tool of quantum process matrices, we develop optimal feedback protocols for these two quantities and experimentally investigate them in a superconducting circuit QED setup.

Citations

• Charge insensitive qubit design derived from the Cooper pair box
• Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
• A simple all-microwave entangling gate for fixed-frequency superconducting qubits
• Equilibrium free energy differences from nonequilibrium measurements: a master equation approach
• Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics
• Quantum operation time reversal
• Thermodynamics of Genuine Nonequilibrium States under Feedback Control
• Information heat engine: converting information to energy by feedback control
• Photonic Maxwell’s Demon
• Correlations of the Time Dependent Signal and the State of a Continuously Monitored Quantum System
• Information-to-work conversion by Maxwell’s demon in a superconducting circuit quantum electrodynamical system
• Quantum Computation and Quantum Information