Discrimination of thermal baths by single qubit probes

Abstract

Non-equilibrium states of quantum systems in contact with thermal baths help telling environments with different temperatures or different statistics apart. We extend these studies to a more generic problem that consists in discriminating between two baths with disparate constituents at unequal temperatures. Notably there exist temperature regimes in which the presence of coherence in the initial state preparation is beneficial for the discrimination capability. We also find that non-equilibrium states are not universally optimal, and detail the conditions in which it becomes convenient to wait for complete thermalisation of the probe. These concepts are illustrated in a linear optical simulation.

arXiv commentFew typos corrected, bibliography expanded

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Cited by in corpus (9)

• Low-temperature quantum thermometry boosted by coherence generation
• Non-equilibrium readiness and accuracy of Gaussian Quantum Thermometers
• Improving the estimation of environment parameters via initial probe-environment correlations
• Discrimination of Ohmic thermal baths by quantum dephasing probes
• Thermodynamic precision in the nonequilibrium exchange scenario
• Quantum thermometry for ultralow temperatures using probe and ancilla qubit chains
• Noise-assisted and monitoring-enhanced quantum bath tagging
• Minimum-error discrimination of thermal states
• Multiclass classification of dephasing channels