Observation of PT-symmetric quantum interference

Abstract

Parity-Time (PT) symmetric quantum mechanics is a complex extension of conventional Hermitian quantum mechanics in which physical observables possess a real eigenvalue spectrum. However, an experimental demonstration of the true quantum nature of PT symmetry has been elusive thus far, as only single-particle physics has been exploited to date. In our work, we demonstrate two-particle quantum interference in a PT-symmetric system. We employ integrated photonic waveguides to reveal that PT-symmetric bunching of indistinguishable photons shows strongly counterintuitive features. We substantiate our experimental results by modelling the system by a quantum master equation, which we analytically solve using Lie algebra methods. Our work paves the way for nonlocal PT-symmetric quantum mechanics as a novel building block for future quantum devices.

References in corpus (16)

• Real Spectra in Non-Hermitian Hamiltonians Having PT Symmetry
• Complex Extension of Quantum Mechanics
• The physics of exceptional points
• Pseudo-Hermitian Representation of Quantum Mechanics
• Experimental Study of Active LRC Circuits with PT-Symmetries
• Probing topological invariants in the bulk of a non-Hermitian optical system
• Spectral equivalences, Bethe Ansatz equations, and reality properties in PT-symmetric quantum mechanics
• Biorthogonal Quantum Mechanics
• Waves in Open Systems: Eigenfunction Expansions
• General description of quasi-adiabatic dynamical phenomena near exceptional points
• Coalescence and anti-coalescence of surface plasmons on a lossy beamsplitter
• Stimulation of the fluctuation superconductivity by the PT-symmetry
• Quasi PT-symmetry in passive photonic lattices
• PT-symmetric photonic quantum systems with gain and loss do not exist
• Topological Wave-Guiding Near an Exceptional Point: Defect-Immune, Slow-Light, Loss-Immune Propagation
• Consistency of PT-symmetric quantum mechanics

Cited by in corpus (75)

• Efficient Light Funneling based on the non-Hermitian Skin Effect
• Non-Abelian braiding on photonic chips
• Breaking Anti-$\mathcal{P}\mathcal{T}$ Symmetry by Spinning a Resonator
• Quantum jumps in the non-Hermitian dynamics of a superconducting qubit
• Nonreciprocal Transmission of Microwave Acoustic Waves in Nonlinear Parity-Time Symmetric Resonators
• Femtosecond laser micromachining for integrated quantum photonics
• Decoherence Induced Exceptional Points in a Dissipative Superconducting Qubit
• Parity-Time Symmetry in Non-Hermitian Complex Optical Media
• Exceptional Photon Blockade: Engineering Photon Blockade with Chiral Exceptional Points
• Encircling exceptional points in a Riemann sphere for efficient asymmetric polarization-locked devices
• Experimental realization of sensitivity enhancement and suppression with exceptional surfaces
• Magnetic suppression of non-Hermitian skin effects
• Non-Dissipative Non-Hermitian Dynamics and Exceptional Points in Coupled Optical Parametric Oscillators
• Quantum simulation of parity-time symmetry breaking with a superconducting quantum processor
• Quantum Random Number Generation using a Solid-State Single-Photon Source
• Stable and oscillating solitons of $\mathcal{P}\mathcal{T}$-symmetric couplers with gain and loss in fractional dimension
• Emergent $\mathcal{P}\mathcal{T}$ symmetry in a double-quantum-dot circuit QED set-up
• Quantum information dynamics in a high-dimensional parity-time-symmetric system
• Interaction induced dynamical $\mathcal{P}\mathcal{T}$ symmetry breaking in dissipative Fermi-Hubbard models
• Quantum correlations in $\mathcal{P}\mathcal{T}$-symmetric systems
• Optomechanical dynamics in the $\mathcal{P}\mathcal{T}$- and broken-$\mathcal{P}\mathcal{T}$-symmetric regimes
• Demonstration of a parity-time symmetry breaking phase transition using superconducting and trapped-ion qutrits
• Non-Hermitian dynamics and $\mathcal{P}\mathcal{T}$-symmetry breaking in interacting mesoscopic Rydberg platforms
• Selective Filtering of Photonic Quantum Entanglement via Anti-Parity-Time Symmetry
• Maximal quantum entanglement at exceptional points via unitary and thermal dynamics
• Observation-dependent suppression and enhancement of two-photon coincidences by tailored losses
• Solving the quantum master equation of coupled harmonic oscillators with Lie algebra methods
• Quantum statistical signature of $\mathcal{P}\mathcal{T}$ symmetry breaking
• Probing phase transitions in non-Hermitian systems with Multiple Quantum Coherences
• Photonic quantum simulations of coupled $PT$-symmetric Hamiltonians
• Exact solution of a non-Hermitian $\mathcal{PT}$-symmetric Heisenberg spin chain
• Anti-parity-time symmetry hidden in a damping linear resonator
• Conserved quantities, exceptional points, and antilinear symmetries in non-Hermitian systems
• Quantum Interference between Photons and Single Quanta of Stored Atomic Coherence
• Floquet exceptional contours in Lindblad dynamics with time-periodic drive and dissipation
• Crossing exceptional points in non-Hermitian quantum systems
• Uncertainty Relation for Non-Hermitian Systems
• Timelessness strictly inside the Quantum Realm
• On-demand Parity-Time symmetry in a lone oscillator through complex, synthetic gauge fields
• Quantum walks of correlated photons in non-Hermitian photonic lattices
• $\mathcal{P}\mathcal{T}$-symmetry breaking in a Kitaev chain with one pair of gain-loss potentials
• Quantum-jump vs stochastic Schrödinger dynamics for Gaussian states with quadratic Hamiltonians and linear Lindbladians
• Connecting active and passive $\mathcal{P}\mathcal{T}$-symmetric Floquet modulation models
• Husimi dynamics generated by non-Hermitian Hamiltonians
• Anomalous spontaneous emission dynamics at chiral exceptional points
• Generalized gauge transformation with $PT$-symmetric non-unitary operator and classical correspondence of non-Hermitian Hamiltonian for a periodically driven system
• Effects of quantum deformation on the Jaynes-Cummings and anti-Jaynes-Cummings models
• Simulating non-Hermitian dynamics of a multi-spin quantum system and an emergent central spin model
• Temporal correlation beyond quantum bounds in non-hermitian dynamics
• Parity-time symmetric systems with memory
• Non-Markovian anti-parity-time symmetric systems: theory and experiment
• Constraining work fluctuations of non-Hermitian dynamics across the exceptional point of a superconducting qubit
• Quantum Optics of Non-Hermitian Optical Systems: Propagation of Squeezed State of Light through Dispersive non-Hermitian Optical Bilayers
• A spin chain with non-Hermitian $\mathcal{PT}-$symmetric boundary couplings: exact solution, dissipative Kondo effect, and phase transitions on the edge
• Experimental demonstration of the dynamics of quantum coherence evolving under a PT-symmetric Hamiltonian on an NMR quantum processor
• Non-Hermiticity in quantum nonlinear optics through symplectic transformations
• Emergent $\mathcal{P}\mathcal{T}$-symmetry breaking of collective modes with topological critical phenomena
• Optical non-Hermitian para-Fermi oscillators
• Correlations at higher-order exceptional points in non-Hermitian models
• Nonadiabatic transitions in non-Hermitian $\mathcal{P}\mathcal{T}$-symmetric two-level systems
• Parity-Time Symmetry and Exceptional points: A Tutorial
• Experimental implementation of arbitrary entangled operations
• Topological Operations Around Exceptional Points via Shortcuts to Adiabaticity
• Non-reciprocal population dynamics in a quantum trimer
• Conserved quantities in non-Hermitian systems via vectorization method
• $\mathcal{P}\mathcal{T}$-Symmetry breaking in quantum spin chains with exceptional non-Hermiticities
• Order-invariant two-photon quantum correlations in PT-symmetric interferometers
• Bloch oscillations in a Bose-Hubbard chain with single-particle losses
• Non-Hermitian physics and engineering in silicon photonics
• Dual opposing quadrature-PT symmetry
• Demonstration of Lossy Linear Transformations and Two-Photon Interference on a Photonic Chip
• A Passive $\mathcal{P}\mathcal{T}$-Symmetric Floquet-Coupler
• Quantum-to-semiclassical Husimi dynamics of non-Hermitian localization transitions
• PT-symmetry enabled stable modes in multi-core fiber
• Quantum Simulation of Two-Level $PT$-Symmetric Systems Using Hermitian Hamiltonians