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Title: Stability of PT and anti- PT -symmetric Hamiltonians with multiple harmonics

Journal Article · · Physical Review Research

Hermitian Hamiltonians with time-periodic coefficients can be analyzed via Floquet theory, and have been extensively used for engineering Floquet Hamiltonians in standard quantum simulators. Generalized to non-Hermitian Hamiltonians, time periodicity offers avenues to engineer the landscape of Floquet quasienergies across the complex plane. We investigate two-level non-Hermitian PT and anti- PT -symmetric Hamiltonians with coefficients that have multiple harmonics using Floquet theory. By analytical and numerical calculations, we obtain their regions of stability, defined by real Floquet quasienergies, and contours of exceptional point (EP) degeneracies. We extend our analysis to study the phases that accompany these cyclic changes with the biorthogonality approach. Our results demonstrate that these time-periodic Hamiltonians generate a rich landscape of stable (real) and unstable (complex) regions. Published by the American Physical Society 2024

Sponsoring Organization:
USDOE
OSTI ID:
2305420
Journal Information:
Physical Review Research, Journal Name: Physical Review Research Vol. 6 Journal Issue: 1; ISSN 2643-1564
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (62)

Observation of PT phase transition in a simple mechanical system journal March 2013
Parity–time symmetry and variable optical isolation in active–passive-coupled microresonators journal June 2014
Modern Quantum Mechanics book January 2017
Topological characterization of periodically driven quantum systems journal December 2010
Unidirectional Invisibility Induced by P T -Symmetric Periodic Structures journal May 2011
Experimental Determination of PT -Symmetric Exceptional Points in a Single Trapped Ion journal February 2021
PT spectroscopy of the Rabi problem journal October 2014
Maximal quantum entanglement at exceptional points via unitary and thermal dynamics journal January 2022
Floquet topological insulator in semiconductor quantum wells journal March 2011
Controllable Floquet edge modes in a multifrequency driving system journal February 2023
Solution of the Schrödinger Equation with a Hamiltonian Periodic in Time journal May 1965
Geometric phase for non-Hermitian Hamiltonian evolution as anholonomy of a parallel transport along a curve journal September 2008
Dynamical Control of Matter-Wave Tunneling in Periodic Potentials journal November 2007
Exact PT -symmetry is equivalent to Hermiticity journal June 2003
Anti–parity-time symmetry in diffusive systems journal April 2019
Observation of slowly decaying eigenmodes without exceptional points in Floquet dissipative synthetic circuits journal December 2018
Berry phase in an anti-PT symmetric metal-semiconductor complex system journal July 2019
Optical waveguide arrays: quantum effects and PT symmetry breaking journal September 2013
Dynamically encircling an exceptional point in anti-parity-time symmetric systems: asymmetric mode switching for symmetry-broken modes journal October 2019
Real Spectra in Non-Hermitian Hamiltonians Having P T Symmetry journal June 1998
Complex Extension of Quantum Mechanics journal December 2002
Pseudo-Parity-Time Symmetry in Optical Systems journal June 2013
Dynamically Encircling an Exceptional Point in a Real Quantum System journal April 2021
Floquet Engineering of Quantum Materials journal March 2019
Localization Transitions in Non-Hermitian Quantum Mechanics journal July 1996
Pseudo-Hermiticity versus PT symmetry: The necessary condition for the reality of the spectrum of a non-Hermitian Hamiltonian journal January 2002
Nonlinear Anti-(Parity-Time) Symmetric Dimer journal April 2022
Quantum state tomography across the exceptional point in a single dissipative qubit journal October 2019
Exceptional points of any order in a single, lossy waveguide beam splitter by photon-number-resolved detection journal January 2019
Observation of parity-time symmetry breaking in a single-spin system journal May 2019
Conserved quantities in parity-time symmetric systems journal May 2020
On-Demand Parity-Time Symmetry in a Lone Oscillator through Complex Synthetic Gauge Fields journal November 2022
Decoherence-Induced Exceptional Points in a Dissipative Superconducting Qubit journal March 2022
PT-symmetric quantum mechanics journal May 1999
Floquet engineering of individual band gaps in an optical lattice using a two-tone drive journal January 2022
Connecting active and passive $\mathcal{PT}$-symmetric Floquet modulation models journal December 2020
Experimental demonstration of exceptional points of degeneracy in linear time periodic systems and exceptional sensitivity journal April 2022
Information retrieval and eigenstate coalescence in a non-Hermitian quantum system with anti- PT symmetry journal January 2022
Observation of P T -Symmetry Breaking in Complex Optical Potentials journal August 2009
PT -symmetric Rabi model: Perturbation theory journal October 2015
Quantum Jumps in the Non-Hermitian Dynamics of a Superconducting Qubit journal September 2021
Experimental study of active LRC circuits with PT symmetries journal October 2011
Antisymmetric PT -photonic structures with balanced positive- and negative-index materials journal November 2013
Photonic Floquet topological insulators journal April 2013
Observation of parity–time symmetry in optics journal January 2010
Berry's Phase journal October 1990
Theory of coupled optical PT-symmetric structures journal January 2007
Complex Berry phase dynamics in PT -symmetric coupled waveguides journal November 2018
Observation of parity-time symmetry breaking transitions in a dissipative Floquet system of ultracold atoms journal February 2019
Geometrical phase in the cyclic evolution of non-Hermitian systems journal December 1990
Quantal Phase Factors Accompanying Adiabatic Changes journal March 1984
Topological Quantum State Control through Exceptional-Point Proximity journal April 2022
Quantum simulation of a general anti-PT-symmetric Hamiltonian with a trapped ion qubit journal November 2023
Anti-Parity-Time Symmetric Optical Four-Wave Mixing in Cold Atoms journal November 2019
Parity–time synthetic photonic lattices journal August 2012
Observation of two 𝓟𝓣 transitions in an electric circuit with balanced gain and loss journal August 2020
Exceptional Points of Degeneracy Induced by Linear Time-Periodic Variation journal January 2019
Floquet maser journal February 2021
Special Issue “Pseudo-Hermitian Hamiltonians in Quantum Physics in 2014” journal January 2015
Space Quantization in a Gyrating Magnetic Field journal April 1937
Anti-parity–time symmetry with flying atoms journal August 2016
Visualization of Branch Points in P T -Symmetric Waveguides journal August 2008