Characterizing a Statistical Arrow of Time in Quantum Measurement Dynamics

Physical Review Letters
P M HarringtonK W Murch

Abstract

In both thermodynamics and quantum mechanics, the arrow of time is characterized by the statistical likelihood of physical processes. We characterize this arrow of time for the continuous quantum measurement dynamics of a superconducting qubit. By experimentally tracking individual weak measurement trajectories, we compare the path probabilities of forward and backward-in-time evolution to develop an arrow of time statistic associated with measurement dynamics. We compare the statistics of individual trajectories to ensemble properties showing that the measurement dynamics obeys both detailed and integral fluctuation theorems, thus establishing the consistency between microscopic and macroscopic measurement dynamics.

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Citations

Sep 11, 2020·Physical Review Letters·Massimiliano RossiAlessio Belenchia
Oct 24, 2020·Physical Review Letters·Kimmo LuomaJyrki Piilo
Mar 25, 2021·Nature Communications·Maitreyi JayaseelanNicholas P Bigelow
Jul 3, 2021·Entropy·Knud Thomsen

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