Quasiprobability fluctuation theorem behind the spread of quantum information

• URL: http://arxiv.org/abs/2201.00385v3
• Date: Thu, 14 Mar 2024 10:34:43 GMT
• Title: Quasiprobability fluctuation theorem behind the spread of quantum information
• Authors: Kun Zhang, Jin Wang,
• Abstract summary: We theoretically uncover the quantum fluctuation theorem behind the informational inequality. The fluctuation theorem quantitatively predicts the statistics of the underlying quantum process. We experimentally apply an interference-based method to measure the amplitudes composing the quasiprobability.
• Score: 10.640597124563614
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Information spreads in time. For example, correlations dissipate when the correlated system locally couples to a third party, such as the environment. This simple but important fact forms the known quantum data-processing inequality. Here we theoretically uncover the quantum fluctuation theorem behind the quantum informational inequality. The fluctuation theorem quantitatively predicts the statistics of the underlying stochastic quantum process. To fully capture the quantum nature, the fluctuation theorem established here is extended to the quasiprobability regime. We also experimentally apply an interference-based method to measure the amplitudes composing the quasiprobability and verify our established fluctuation theorem by the IBM quantum computer.

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