Non-Hermitian Dynamics Without Loss Using Superconducting Circuits

ORAL

Abstract

Non-Hermitian systems can exhibit interesting behaviors not seen in Hermitian systems, such as the presence of exceptional points where two (or more) eigenvectors collapse onto each other. Systems that exhibit these points typically involve loss and gain that considerably restricts the amount of quantum coherence. In this talk, following a proposal by Wang and Clerk [1], we describe a closed, four-mode quantum system able to simulate the dynamics of a PT-dimer consisting of two coupled resonators, one with gain and the other with loss, ideally without any actual dissipation that could introduce noise. The four modes are implemented using four harmonics of a superconducting resonator. Arbitrary parametric coupling between the modes is achieved using a SNAIL coupler pumped by microwave drives which gives us wide-ranging control over all parameters. In addition to the physics of the classical PT-dimer, we also expect to observe inter-mode entanglement.

[1] Yu-Xin Wang and A. A. Clerk, “Non-Hermitian dynamics without dissipation in quantum systems”, Phys. Rev. A 99, 063834 (2019)

* This material is based upon work supported by the Air Force Office of Scientific Research under award number FA9550-22-1-0166 and by the Under Secretary of Defense for Research and Engineering under Air Force Contract No. FA8702-15-D-0001. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the U.S. Government.

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Presenters

  • Réouven Assouly

    Massachussets Institute of Technology

Authors

  • Réouven Assouly

    Massachussets Institute of Technology

  • Harry H Kang

    Massachussets Institute of Technology, Massachusetts Institute of Technology

  • Michael A Gingras

    MIT Lincoln Laboratory

  • Bethany M Niedzielski

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Hannah M Stickler

    MIT Lincoln Laboratory

  • Jonilyn L Yoder

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Mollie E Schwartz

    MIT Lincoln Laboratory

  • Kyle Serniak

    MIT Lincoln Laboratory & MIT RLE, MIT Lincoln Laboratory, MIT Lincoln Laboratory, MIT RLE

  • Jeffrey A Grover

    Massachusetts Institute of Technology, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MIT

  • William D Oliver

    Massachusetts Institute of Technology MI, Massachusetts Institute of Technology, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MIT