Delayed sudden death of entanglement at exceptional points

Abstract

Almost a decade ago, physicists encountered a strange quantum phenomenon that predicts an unusual death of entanglement under the influence of local noisy environment,known as entanglement sudden death (ESD). This could be an immediate stumbling block in realizing all the entanglement based quantum information and computation protocols. In this work, we propose a scheme to tackle such shortcomings by exploiting the phenomenon of exceptional points (EP). Starting with a binary mechanical $\mathcal{P}\mathcal{T}$ symmetric system, realized over an optomechanical platform, we show that a substantial delay in ESD can be achieved via pushing the system towards an exceptional point. This finding has been further extended to higher (third) order exceptional point by considering a more complicated tripartite entanglement into account.

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Cited by in corpus (23)

• Signatures of Liouvillian exceptional points in a quantum thermal machine
• Perfect Transfer of enhanced entanglement and asymmetric steering in a cavity magnomechanical system
• Non-Dissipative Non-Hermitian Dynamics and Exceptional Points in Coupled Optical Parametric Oscillators
• Resolving the topology of encircling multiple exceptional points
• Controlling decoherence via $\mathcal{P}\mathcal{T}$-symmetric non-Hermitian open quantum systems
• Entanglement Dynamics in Anti-$\mathcal{P}\mathcal{T}$-Symmetric Systems
• Quantum entanglement assisted via Duffing nonlinearity
• Exceptional point induced quantum phase synchronization and entanglement dynamics in mechanically coupled gain-loss oscillators
• Exceptional-point-assisted entanglement, squeezing, and reset in a chain of three superconducting resonators
• Light transfer transitions beyond higher-order exceptional points in parity-time and anti-parity-time symmetric waveguide arrays
• Accelerating multipartite entanglement generation in non-Hermitian superconducting qubits
• Quantum correlations in dissipative gain-loss systems across exceptional points
• Microwave Amplification in a PT -symmetric-like Cavity Magnomechanical System
• Two-way enhancement of sensitivity by tailoring higher-order exceptional points
• Entanglement entropy distinguishes PT-symmetry and topological phases in a class of non-unitary quantum walks
• Non-Hermitian physics and engineering in silicon photonics
• Robustness of entanglement in a non-Hermitian cavity-optomechanical system even away from exceptional points
• Nonreciprocity of intense light field and weak quantum signal in optomechanical systems with three-mode parametric interactions
• Improved coherence time of a non-Hermitian qubit in a $\mathcal{P}\mathcal{T}$-symmetric Environment
• Convex-roof entanglement measures of density matrices block diagonal in disjoint subspaces for the study of thermal states
• General recipe for immediate entanglement death-birth transitions via Bell states: environmental Heisenberg exchange as an example
• Computational Complexity and Simulability of Non-Hermitian Quantum Dynamics
• Non-Markovian renormalization of optomechanical exceptional points