Dissipation-free non-Hermitian physics using quantum parametric amplifiers

ORAL

Abstract

There has been considerable interest in driven-dissipative systems governed by non-Hermitian effective Hamiltonians. These systems can exhibit a range of unusual phenomena, such as the spontaneous breaking of parity-time (PT) symmetry [1], and chiral effects associated with encircling exceptional points [1]. Quantum versions of these effects are however often compromised by their dissipative nature. Here, we show that many of these non-Hermitian effects can be realized in a completely non-dissipative setting, by exact unitary mappings to parametrically-driven bosonic setups. Applications of these mappings include enhanced quantum sensing using exceptional points, and chiral switching based on encircling of exceptional points. Our approach could be implemented experimentally using superconducting quantum circuits, or in optomechanical systems.
[1] R. El-Ganainy, K. G. Makris, M. Khajavikhan, Z. H. Musslimani, S. Rotter, and D. N. Christodoulides, Nat. Phys. 14, 11 (2018).

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Presenters

  • Yuxin Wang

    Institute for Molecular Engineering, University of Chicago

Authors

  • Yuxin Wang

    Institute for Molecular Engineering, University of Chicago

  • Aashish Clerk

    Institute for Molecular Engineering, University Of Chicago, Molecular Engineering, Institute for Molecular Engineering at the University of Chicago, Institute for Molecular Engineering, University of Chicago, University of Chicago