Non-Markovian temperature sensing

• URL: http://arxiv.org/abs/2110.07820v1
• Date: Fri, 15 Oct 2021 02:34:24 GMT
• Title: Non-Markovian temperature sensing
• Authors: Ze-Zhou Zhang and Wei Wu
• Abstract summary: We go beyond traditional paradigms of the Born-Markov theory, the pure dephasing mechanism, and the weak-coupling approximation. Our results may have certain applications for high-resolution quantum thermometry.
• Score: 4.8229512034776
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate the sensing performance of a single-qubit quantum thermometer within a non-Markovian dynamical framework. By employing an exactly numerical hierarchical equations of the motion method, we go beyond traditional paradigms of the Born-Markov theory, the pure dephasing mechanism, and the weak-coupling approximation, which were commonly used in many previous studies of quantum thermometry. We find (i) the non-Markovian characteristics may boost the estimation efficiency, (ii) the sensitivity of quantum thermometry can be effectively optimized by engineering the proportions of different coupling operators in the whole sensor-reservoir interaction Hamiltonian, and (iii) a threshold, above which the strong sensor-reservoir coupling can significantly enhance the sensing precision in the long-encoding-time regime. Our results may have certain applications for high-resolution quantum thermometry.

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