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Heat current and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback
by Tsuyoshi Yamamoto, Yasuhiro Tokura
Submission summary
| Authors (as registered SciPost users): | Tsuyoshi Yamamoto |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2409.09452v1 (pdf) |
| Date submitted: | 2024-09-26 02:11 |
| Submitted by: | Yamamoto, Tsuyoshi |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
Continuous quantum measurement and feedback induce heat 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 heat current 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 heat current 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 electric 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.
Author indications on fulfilling journal expectations
- Provide a novel and synergetic link between different research areas.
- Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
- Detail a groundbreaking theoretical/experimental/computational discovery
- Present a breakthrough on a previously-identified and long-standing research stumbling block