Quantum correlations near the exceptional point

Abstract

Recent advances in non-Hermitian physical systems have led to numerous novel optical phenomena and applications. However, most realizations are limited to classical systems and quantum fluctuations of light is unexplored. For the first time, we report the observation of quantum correlations between light channels in an anti-symmetric optical system made of flying atoms. Two distant optical channels coupled dissipatively, display gain, phase sensitivity and quantum correlations with each other, even under linear atom-light interaction within each channel. We found that quantum correlations emerge in the phase unbroken regime and disappears after crossing the exceptional point. Our microscopic model considering quantum noise evolution produces results in good qualitative agreement with experimental observations. This work opens up a new direction of experimental quantum nonlinear optics using non-Hermitian systems, and demonstrates the viability of nonlinear coupling with linear systems by using atomic motion as feedback.

References in corpus (30)

• Real Spectra in Non-Hermitian Hamiltonians Having PT Symmetry
• Nonreciprocal light transmission in parity-time-symmetric whispering-gallery microcavities
• Unidirectional Invisibility induced by PT-Symmetric Periodic Structures
• Dark-State Polaritons in Electromagnetically Induced Transparency
• Quantum interface between light and atomic ensembles
• Dynamically encircling exceptional points in a waveguide: asymmetric mode switching from the breakdown of adiabaticity
• Topological energy transfer in an optomechanical system with exceptional points
• Spawning rings of exceptional points out of Dirac cones
• Observation of non-Hermitian degeneracies in a chaotic exciton-polariton billiard
• Entanglement generated by dissipation and steady state entanglement of two macroscopic objects
• Quantum versus classical correlations in Gaussian states
• Gaussian quantum discord
• Anti-Parity-Time Symmetric Optics via Flying Atoms
• Observation of parity-time symmetry breaking in a single spin system
• Quantum state tomography across the exceptional point in a single dissipative qubit
• Non-Hermitian Quantum Sensing: Fundamental Limits and Non-Reciprocal Approaches
• The emergence, coalescence and topological properties of multiple exceptional points and their experimental realization
• Parity-time-symmetric quantum critical phenomena
• Observation of an exceptional point in a chaotic optical microcavity
• Quantum simulation of open-system dynamical maps with trapped ions
• Quantum Synchronization of Two Ensembles of Atoms
• Information Retrieval and Criticality in Parity-Time-Symmetric Systems
• Antisymmetric PT-photonic structures with balanced positive and negative index materials
• Synchronization of many nano-mechanical resonators coupled via a common cavity field
• Investigation of microwave transitions and nonlinear magneto-optical rotation in anti-relaxation-coated cells
• Synchronization of Interacting Quantum Dipoles
• Double-lambda microscopic model for entangled light generation by four-wave-mixing
• Spontaneous Generation of Photons in Transmission of Quantum Fields in PT Symmetric Optical Systems
• PT-symmetry breaking in the steady state of microscopic gain-loss systems
• Coherent Diffusion of Polaritons in Atomic Media

Cited by in corpus (25)

• Non-Hermitian Physics
• Unconventional Singularity in Anti-Parity-Time Symmetric Cavity Magnonics
• Breaking Anti-$\mathcal{P}\mathcal{T}$ Symmetry by Spinning a Resonator
• Exceptional Photon Blockade: Engineering Photon Blockade with Chiral Exceptional Points
• Observation of $\mathcal{P}\mathcal{T}$-symmetric quantum coherence in a single ion system
• Exceptional Non-Abelian Topology in Multiband Non-Hermitian Systems
• Fundamental limits for reciprocal and non-reciprocal non-Hermitian quantum sensing
• Non-reciprocity and quantum correlations of light transport in hot atoms via reservoir engineering
• Exotic interactions mediated by a non-Hermitian photonic bath
• Nonreciprocal slow or fast light in anti-$\mathcal{P}\mathcal{T}$-symmetric optomechanics
• Magnon-Skyrmion Hybrid Quantum Systems: Tailoring Interactions via Magnons
• Anti-$\mathcal{P}\mathcal{T}$-symmetric Kerr gyroscope
• Emergent $\mathcal{P}\mathcal{T}$ symmetry in a double-quantum-dot circuit QED set-up
• Quantum correlations in $\mathcal{P}\mathcal{T}$-symmetric systems
• Exponentially-enhanced Quantum Non-Hermitian Sensing via Optimized Coherent Drive
• Realizing exceptional points by Floquet dissipative couplings in thermal atoms
• Crossing exceptional points in non-Hermitian quantum systems
• Topological atomic spinwave lattices by dissipative couplings
• A spin chain with non-Hermitian $\mathcal{PT}-$symmetric boundary couplings: exact solution, dissipative Kondo effect, and phase transitions on the edge
• Unveiling Eigenstate Thermalization for Non-Hermitian systems
• Quantum correlations in dissipative gain-loss systems across exceptional points
• Short-time behavior of a system ruled by non-Hermitian time-dependent Hamiltonians
• Witnessing criticality in non-Hermitian systems via entropic uncertainty relation
• Multitype entanglement dynamics induced by exceptional points
• Environment-assisted squeezing in a coherently driven non-Hermitian degenerate parametric oscillator