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Direct entropy measurement of coupled quantum systems

ORAL · Invited

Abstract

Recent experiments have demonstrated the power of using Maxwell relations to measure entropy in nanoscale systems, from bulk electronic phases in magic angle graphene to isolated spins in semiconductor quantum dots. This talk will present an overview of this approach as it is applied to non-trivial mesoscopic quantum circuits, focusing on the challenges and opportunities created when the thermal "system" and "reservoir" become hard to disentangle. We will focus on two examples of entropy measurements in a quantum dot, when that dot is strongly coupled either to a second quantum dot or to a reservoir of conduction electrons in the lead. Then, we will give an outlook on the promise of this approach for addressing questions in mesoscopic physics.

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Publication: A Robust Protocol for Entropy Measurement in Mesoscopic Circuits; T. Child, O. Sheekey, S. Luescher, S. Fallahi, G. C. Gardner, M. Manfra, J. A. Folk; Entropy, 24(3) 417 (2022).<br>Entropy measurement of a strongly coupled quantum dot; T. Child, O. Sheekey, S. Luescher, S. Fallahi, G. C. Gardner, M. Manfra, A. Mitchell, E. Sela, Y. Kleeorin, Y. Meir, J. A. Folk; arxiv:2110.14158, (2021).

Presenters

  • Joshua Folk

    University of British Columbia, Physics and Astronomy, University of British Columbia

Authors

  • Joshua Folk

    University of British Columbia, Physics and Astronomy, University of British Columbia

  • Tim J Child

    Physics and Astronomy, University of British Columbia, University of British Columbia

  • Silvia Lüscher

    University of British Columbia, Physics and Astronomy, University of British Columbia

  • Johann Drayne

    Physics and Astronomy, University of British Columbia, Stewart Blusson Quantum Matter Institute

  • Saeed Fallahi

    Purdue University, Microsoft Quantum Purdue, Physics and Astronomy, Purdue University, Purdue University

  • Geoff C Gardner

    Purdue University, Materials Engineering, Purdue University, Department of Physics and Astronomy, Birck Nanotechnology Center, Purdue University

  • Michael J Manfra

    Purdue University, Microsoft Quantum Purdue, Purdue University, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA; Microsoft Quantum Lab, Purdue University, West Lafayette, IN, USA, Physics and Astronomy, Purdue University, Department of Physics and Astronomy, Birck Nanotechnology Center, School of Electrical and Computer Engineering and Microsoft Quantum Lab West Lafayette, Purdue University, Department of Physics and Astronomy and Nanotechnology Center Purdue University, Microsoft Quantum Lab West Lafayette, Department of Physics and Astronomy, Birck Nanotechnology Center, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University

  • Yaakov Kleeorin

    Center for the Physics of Evolving Systems, University of Chicago, Ben-Gurion University of the Negev

  • Andrew K Mitchell

    University College Dublin, Ireland, Univ Coll Dublin

  • Eran Sela

    Tel Aviv University, TAU

  • Yigal Meir

    Department of Physics, Ben-Gurion University of the Negev, Ben Gurion University, Ben-Gurion University of the Negev