Discrimination of thermal baths by single qubit probes

• URL: http://arxiv.org/abs/2005.02820v2
• Date: Thu, 7 May 2020 12:47:38 GMT
• Title: Discrimination of thermal baths by single qubit probes
• Authors: Ilaria Gianani, Donato Farina, Marco Barbieri, Valeria Cimini, Vasco Cavina, Vittorio Giovannetti
• Abstract summary: 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 of discriminating between two baths with disparate constituents at unequal temperatures.
• Score: 1.3048920509133808
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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