TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysCore.8.1.016
TI  - Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback
PY  - 2025/02/10
UR  - https://www.scipost.org/SciPostPhysCore.8.1.016
JF  - SciPost Physics Core
JA  - SciPost Phys. Core
VL  - 8
IS  - 1
SP  - 016
A1  - Yamamoto, Tsuyoshi
AU  - Tokura, Yasuhiro
AB  - Continuous quantum measurement and feedback induce energy exchange between a dissipative qubit and a monitor even in the steady state, as a measurement backaction. Using the Lindblad equation, we identified the maximum and minimum values of the steady-state energy flow as the measurement and feedback states vary, and we demonstrate the qubit cooling induced by these processes. Turning our attention to quantum trajectories under continuous measurement and feedback, we observe that the energy flow fluctuates around the steady-state values. We reveal that the fluctuations are strongly influenced by the measurement backaction, distinguishing them from the standard Poisson noise typically observed in electronic circuits. Our results offer potential application in the development of quantum refrigerators controlled by continuous measurement and feedback, and provide deep insight into quantum thermodynamics from the perspective of fluctuation.
ER  -

@Article{10.21468/SciPostPhysCore.8.1.016,
	title={{Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback}},
	author={Tsuyoshi Yamamoto and Yasuhiro Tokura},
	journal={SciPost Phys. Core},
	volume={8},
	pages={016},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhysCore.8.1.016},
	url={https://scipost.org/10.21468/SciPostPhysCore.8.1.016},
}