Fisher zeros and persistent temporal oscillations in nonunitary quantum circuits
ORAL
Abstract
We present a quantum circuit with measurements and postselection that exhibits a panoply of space- and/or time-ordered phases from ferromagnetic order to spin-density waves to time crystals. Unlike the time crystals that have been found in unitary models, those that occur here are incommensurate with the drive frequency. The period of the incommensurate time-crystal phase may be tuned by adjusting the circuit parameters. We demonstrate that the phases of our quantum circuit, including the inherently nonequilibrium dynamical ones, correspond to complex-temperature equilibrium phases of the exactly solvable square-lattice anisotropic Ising model.
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Publication: S. Basu, D. P. Arovas, S. Gopalakrishnan, C. A. Hooley, and V. Oganesyan, Phys. Rev. Research 4, 013018 (2022)
Presenters
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Christopher A Hooley
Univ of St Andrews
Authors
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Christopher A Hooley
Univ of St Andrews
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Sankhya Basu
The Graduate Center, City University of
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Daniel P Arovas
University of California, San Diego
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Sarang Gopalakrishnan
Princeton University, The Pennsylvania State University, Penn State University, Princeton
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Vadim Oganesyan
CUNY, Staten Island, The Graduate Center, City University of New York