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- W3136608708 abstract "Abstract The origin of macroscopic irreversibility from microscopically time-reversible dynamical laws—often called the arrow-of-time problem—is of fundamental interest in both science and philosophy. Experimentally probing such questions in quantum theory requires systems with near-perfect isolation from the environment and long coherence times. Ultracold atoms are uniquely suited to this task. We experimentally demonstrate a striking parallel between the statistical irreversibility of wavefunction collapse and the arrow of time problem in the weak measurement of the quantum spin of an atomic cloud. Our experiments include statistically rare events where the arrow of time is inferred backward; nevertheless we provide evidence for absolute irreversibility and a strictly positive average arrow of time for the measurement process, captured by a fluctuation theorem. We further demonstrate absolute irreversibility for measurements performed on a quantum many-body entangled wavefunction—a unique opportunity afforded by our platform—with implications for studying quantum many-body dynamics and quantum thermodynamics." @default.
- W3136608708 created "2021-03-29" @default.
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- W3136608708 date "2021-03-23" @default.
- W3136608708 modified "2023-10-16" @default.
- W3136608708 title "Quantum measurement arrow of time and fluctuation relations for measuring spin of ultracold atoms" @default.
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- W3136608708 doi "https://doi.org/10.1038/s41467-021-22094-3" @default.
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