Quantum Virtual Cooling

ORAL

Abstract

We propose a quantum information based scheme to reduce the temperature of quantum many- body systems, and access regimes beyond the current capability of conventional cooling techniques. We show that collective measurements on multiple copies of a system at finite temperature can simulate measurements of the same system at a lower temperature. This idea is illustrated for the example of ultracold atoms in optical lattices, where controlled tunnel coupling and quantum gas microscopy can be naturally combined to realize the required collective measurements to access a lower, virtual temperature. Our protocol is experimentally implemented for a Bose-Hubbard model on up to 12 sites, and we successfully extract expectation values of observables at half the temperature of the physical system. Additionally, we present related techniques that enable the extraction of zero-temperature states directly.

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Authors

  • Jordan Cotler

    • Stanford University

  • Soonwon Choi

    • University of California, Berkeley
    • University of California Berkeley

  • Alexander Lukin

    • Harvard University

  • Hrant Gharibyan

    • Stanford University

  • Tarun Grover

    • University of California at San Diego

  • M. Eric Tai

    • Harvard University

  • Matthew Rispoli

    • Harvard University

  • Robert Schittko

    • Harvard University

  • Philipp Preiss

    • Harvard University and Heidelberg University

  • Adam Kaufman

    • Harvard University and JILA

  • Markus Greiner

    • Harvard University

  • Hannes Pichler

    • Harvard University
    • Harvard - Smithsonian Center for Astrophysics

  • Patrick Hayden

    • Stanford University