TY - JOUR
T1 - Observing parity-time symmetry breaking in a Josephson parametric amplifier
AU - Gaikwad, Chandrashekhar
AU - Kowsari, Daria
AU - Chen, Weijian
AU - Murch, Kater W.
N1 - Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2023
Y1 - 2023
N2 - A coupled two-mode system with balanced gain and loss is a paradigmatic example of an open quantum system that can exhibit real spectra despite being described by a non-Hermitian Hamiltonian. We utilize a degenerate parametric amplifier operating in three-wave mixing mode to realize such a system of balanced gain and loss between the two quadrature modes of the amplifier. By examining the time-domain response of the amplifier, we observe a characteristic transition from real-to-imaginary energy eigenvalues associated with the parity-time symmetry breaking transition.
AB - A coupled two-mode system with balanced gain and loss is a paradigmatic example of an open quantum system that can exhibit real spectra despite being described by a non-Hermitian Hamiltonian. We utilize a degenerate parametric amplifier operating in three-wave mixing mode to realize such a system of balanced gain and loss between the two quadrature modes of the amplifier. By examining the time-domain response of the amplifier, we observe a characteristic transition from real-to-imaginary energy eigenvalues associated with the parity-time symmetry breaking transition.
UR - https://www.scopus.com/pages/publications/85178083797
U2 - 10.1103/PhysRevResearch.5.L042024
DO - 10.1103/PhysRevResearch.5.L042024
M3 - Article
AN - SCOPUS:85178083797
SN - 2643-1564
VL - 5
JO - Physical Review Research
JF - Physical Review Research
IS - 4
M1 - L042024
ER -