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Quantum Information Processing
Published in: Quantum Information Processing 4/2021

01-04-2021

Quantum thermometry by single qubit-probe in a thermal XY spin-chain bath

Authors: Lionel Tenemeza Kenfack, William Degaulle Waladi Gueagni, Martin Tchoffo, Lukong Cornelius Fai

Published in: Quantum Information Processing | Issue 4/2021

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Abstract

We address the estimation of temperature in a thermal XY spin-chain through quantum probe and tools of parameter estimation theory, namely the quantum Fisher information and signal to noise ratio. We focus on the situation where the probe is weakly coupled to the bath to ensure its coherent time-evolution as long as possible and, in turn, an accurate estimation of the bath temperature. Our results provide clear evidence that the estimation precision can be effectively improved by properly adjusting the probe–bath and bath-spins coupling strength. Indeed, we demonstrate that the optimum precision in the estimation of the bath temperature is achieved when the probe–bath and bath spins coupling strength are equals, leading to a long-time interaction of the probe with the bath.
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Metadata
Title
Quantum thermometry by single qubit-probe in a thermal XY spin-chain bath
Authors
Lionel Tenemeza Kenfack
William Degaulle Waladi Gueagni
Martin Tchoffo
Lukong Cornelius Fai
Publication date
01-04-2021
Publisher
Springer US
Published in
Quantum Information Processing / Issue 4/2021
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-021-03075-3

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