CQuIC Seminars
Fluctuation Theorem for Many-body Pure Quantum States
Presented by Takahiro Sagawa, University of Tokyo
The origin of macroscopic irreversibility under microscopic reversible dynamics is a longstanding fundamental problem in nonequilibrium statistical mechanics. In recent years, it has been established that even a pure quantum state, described by a single wave function, can relax to macroscopic thermal equilibrium by reversible unitary dynamics. We here show that the second law of thermodynamics and the fluctuation theorem, a universal equality characterizing the property of entropy production far from equilibrium, hold true for isolated genuine quantum systems under unitary dynamics [1]. Our study is based on a rigorous proof by using the Lieb-Robinson bound, and numerical simulation of hard-core bosons. Our results imply that thermal fluctuations emerge from purely quantum fluctuations in nonequilibrium dynamics. We also discuss a role of eigenstate-thermalization hypothesis (ETH).
[1] Eiki Iyoda, Kazuya Kaneko, Takahiro Sagawa, arXiv:1603.07857.
3:30 pm, Monday, November 14, 2016
PAIS-2540, PAIS
Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact the Physics Department (phone: 505-277-2616, email: physics@unm.edu) well in advance to ensure your needs are accomodated. Event handouts can be provided in alternative accessible formats upon request. Please contact the Physics front office if you need written information in an alternative format.
A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at http://physics.unm.edu/pandaweb/events/index.php