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Enhancing precision thermometry with nonlinear qubits

Year: 2024

Type: article

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.

Source: Maryland Shared Open Access Repository (USMAI Consortium)

DOI: 10.13016/m2vltd-xe0y

Author: Deffner, Sebastian

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, John Templeton Foundation, Division of Materials Research

Awards: G2150551741, Maryland Quantum-Thermodynamics Hub: Decoherence and Equilibration in Quantum Systems, Stochastic Thermodynamics of Nonlinear Quantum Systems, G6347607356

OpenAlex ID: W6959816829

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