Enhancing precision thermometry with nonlinear qubits
arXiv:2408.16664 · doi:10.1088/2058-9565/adac05
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 Schrödinger 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.
9 pages, 4 figures
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- Quantum thermodynamics of Gross-Pitaevskii qubits
- Suppressing excitations in the nonlinear Landau-Zener model
- Information Processing in Quantum Thermodynamic Systems: an Autonomous Hamiltonian Approach
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