Related papers: Enhancing precision thermometry with nonlinear qubits

Enhancing precision thermometry with nonlinear qubits

URL: http://arxiv.org/abs/2408.16664v1
Date: Thu, 29 Aug 2024 16:08:07 GMT
Title: Enhancing precision thermometry with nonlinear qubits
Authors: Sebastian Deffner,
Abstract summary: Quantum thermometry refers to the study of measuring ultra-low temperatures in quantum systems. The precision of such a quantum thermometer is limited by the degree to which temperature can be estimated by quantum measurements. We show that quantum thermometers described by nonlinear Schr"odinger equations allow for a significantly enhanced precision.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Quantum thermometry refers to the study of measuring ultra-low temperatures in quantum systems. The precision of such a quantum thermometer is limited by the degree to which temperature can be estimated by quantum measurements. More precisely, the maximal precision is given by the inverse of the quantum Fisher information. In the present analysis, we show that quantum thermometers that are described by nonlinear Schr\"odinger equations allow for a significantly enhanced precision, that means larger quantum Fisher information. This is demonstrated for a variety of pedagogical scenarios consisting of single and two-qubits systems. The enhancement in precision is indicated by non-vanishing quantum speed limits, which originate in the fact that the thermal, Gibbs state is typically not invariant under the nonlinear equations of motion.

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