Year: 2022
Type: article
Abstract: Measurement and feedback control are essential features of quantum science, with applications ranging from quantum technology protocols to information-to-work conversion in quantum thermodynamics. Theoretical descriptions of feedback control are typically given in terms of stochastic equations requiring numerical solutions, or are limited to linear feedback protocols. Here we present a formalism for continuous quantum measurement and feedback, both linear and nonlinear. Our main result is a quantum Fokker-Planck master equation describing the joint dynamics of a quantum system and a detector with finite bandwidth. For fast measurements, we derive a Markovian master equation for the system alone, amenable to analytical treatment. We illustrate our formalism by investigating two basic information engines, one quantum and one classical.
Source: Physical Review Letters
Language: English
Subfield: Statistical and Nonlinear Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
Awards: G2423149410, G434337789, Harvesting Non-Classical Fluctuations with Thermal Machines, Fluctuations of thermodynamic observables across the quantum-to-classical transition, Fluctuations, Sensing, and Information in Open Quantum Systems, Harvesting Non-Classical Fluctuations with Thermal Machines, G712881263, Quantum coherent transport, fluctuations and thermodynamics in electronic nanosystem, G816824427
OpenAlex ID: W3207439598