Mixing thermal coherent states for precision and range enhancement in quantum thermometry
The unavoidable interaction between thermal environments and quantum systems typically leads to the degradation of quantum coherence, which can be fought against by reservoir engineering. We propose the realization of a special mixture of thermal coherent states by coupling a thermal bath with a two...
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| Main Authors | , , |
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| Format | Journal Article |
| Language | English |
| Published |
07.06.2023
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| Subjects | |
| Online Access | Get full text |
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| Summary: | The unavoidable interaction between thermal environments and quantum systems
typically leads to the degradation of quantum coherence, which can be fought
against by reservoir engineering. We propose the realization of a special
mixture of thermal coherent states by coupling a thermal bath with a two-level
system that is longitudinally coupled to a resonator. We find that the state of
the resonator is a special mixture of two oppositely displaced thermal coherent
states, whereas the two-level system remains thermal. This observation is
verified by evaluating the second-order correlation coefficient for the
resonator state. Moreover, we reveal the potential benefits of employing the
mixture of thermal coherent states of the resonator in quantum thermometry. In
this context, the resonator functions as a probe to measure the unknown
temperature of a bath mediated by a two-level system, strategically bridging
the connection between the two. Our results show that the use of an
ancillary-assisted probe may broaden the applicable temperature range. |
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| DOI: | 10.48550/arxiv.2306.04369 |