Robustness of bipartite Gaussian entangled beams propagating in lossy channels

Abstract

Subtle quantum properties offer exciting new prospects in optical communications. Quantum entanglement enables the secure exchange of cryptographic keys and the distribution of quantum information by teleportation. Entangled bright beams of light attract increasing interest for such tasks, since they enable the employment of well-established classical communications techniques. However, quantum resources are fragile and undergo decoherence by interaction with the environment. The unavoidable losses in the communication channel can lead to a complete destruction of useful quantum properties -- the so-called "entanglement sudden death". We investigate the precise conditions under which this phenomenon takes place for the simplest case of two light beams and demonstrate how to produce states which are robust against losses. Our study sheds new light on the intriguing properties of quantum entanglement and how they may be tamed for future applications.

arXiv commentTo be published - Nature Photonics

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Cited by in corpus (22)

• Open-System Dynamics of Entanglement
• Experimental demonstration of remotely creating Wigner negativity via quantum steering
• Disentanglement in Bipartite Continuous-Variable Systems
• Experimental analysis of decoherence of quantumness in a continuous variables bi-partite entangled system
• Characterizing the multipartite continuous-variable entanglement structure from squeezing coefficients and the Fisher information
• Experimental investigation of enviroment--induced entanglement using an all--optical setup
• Entanglement transfer in a noisy cavity network with parity-deformed radiation fields
• Is nonclassicality-breaking the same thing as entanglement-breaking?
• Testing spectral filters as Gaussian quantum optical channels
• Third-order nonlinearity OPO: Schmidt Mode Decomposition And Tripartite Entanglement
• Analyzing the Gaussian character of the spectral quantum state of light via quantum noise measurements
• Quantum-optical channels that output only classical states
• Effect of incoherent pump on two-mode entanglement in optical parametric generation
• Entanglement breaking channels and entanglement sudden death
• Locally optimal control of continuous variable entanglement
• Quantum jump simulation in three-level systems using photonic Gaussian modes
• Robust Gaussian Teleportation with Attenuations and Non-unity Gain
• Nondestructive verification of continuous-variable entanglement
• Experimental demonstration of robustness of Gaussian quantum coherence
• Superior resilience of non-Gaussian entanglement against local Gaussian noises
• Some aspects of the interplay between bipartite correlations and quantum channels
• Sudden death and revival of Gaussian Einstein-Podolsky-Rosen steering in noisy channels