Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback
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 feedbac...
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| Format: | Article |
| Language: | English |
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SciPost
2025-02-01
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| Series: | SciPost Physics Core |
| Online Access: | https://scipost.org/SciPostPhysCore.8.1.016 |
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| author | Tsuyoshi Yamamoto, Yasuhiro Tokura |
| author_facet | Tsuyoshi Yamamoto, Yasuhiro Tokura |
| author_sort | Tsuyoshi Yamamoto, Yasuhiro Tokura |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-98173e342b4f49cda241be074780d846 |
| institution | Kabale University |
| issn | 2666-9366 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | SciPost |
| record_format | Article |
| series | SciPost Physics Core |
| spelling | doaj-art-98173e342b4f49cda241be074780d8462025-02-10T12:48:03ZengSciPostSciPost Physics Core2666-93662025-02-018101610.21468/SciPostPhysCore.8.1.016Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedbackTsuyoshi Yamamoto, Yasuhiro TokuraContinuous 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.https://scipost.org/SciPostPhysCore.8.1.016 |
| spellingShingle | Tsuyoshi Yamamoto, Yasuhiro Tokura Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback SciPost Physics Core |
| title | Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback |
| title_full | Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback |
| title_fullStr | Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback |
| title_full_unstemmed | Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback |
| title_short | Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback |
| title_sort | energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback |
| url | https://scipost.org/SciPostPhysCore.8.1.016 |
| work_keys_str_mv | AT tsuyoshiyamamotoyasuhirotokura energyexchangeandfluctuationsbetweenadissipativequbitandamonitorundercontinuousmeasurementandfeedback |