Efficient Quantum Gibbs Samplers | Quantum Colloquium

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Simons Institute for the Theory of Computing

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Published on March 28, 2023 10:34:45 PM ● Video Link: https://www.youtube.com/watch?v=m3lowRs3TQU

Duration: 1:39:30

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Chi Fang (Anthony) Chen (Caltech)
https://simons.berkeley.edu/events/quantum-colloquium-efficient-quantum-gibbs-samplers
Quantum Colloquium

How to prepare quantum Gibbs states or ground states on a quantum computer? A natural candidate is quantum Gibbs sampling, a quantum analog of classical Monte Carlo algorithms or, put differently, an algorithmic implementation of physical thermalization in open systems. Unfortunately, satisfactory construction for quantum Gibbs samplers has been missing for the past decade due to technical obstacles associated with energy uncertainty. Today, I will first present an efficient construction of quantum Gibbs samplers with provable guarantees depending on the mixing time. Second, we show fast mixing, assuming the Eigenstate Thermalization Hypothesis (ETH). The talk is based on joint works with Fernando Brandao, Andras Gilyen, and Michael Kastoryano.

Panel discussion: Anurag Anshu (Harvard), Angela Capel (Universität Tübingen), and David Gosset (University of Waterloo). Moderated by Umesh Vazirani (UC Berkeley)