Resilience of multi-photon entanglement under losses

Abstract

We analyze the resilience under photon loss of the bi-partite entanglement present in multi-photon states produced by parametric down-conversion. The quantification of the entanglement is made possible by a symmetry of the states that persists even under polarization-independent losses. We examine the approach of the states to the set of states with a positive partial transpose as losses increase, and calculate the relative entropy of entanglement. We find that some bi-partite distillable entanglement persists for arbitrarily high losses.

5 pages, 3 figures, title changed, minor typographic errors corrected

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Cited by in corpus (15)

• Quantitative entanglement witnesses
• Polarization-Entangled Light Pulses of 10^5 Photons
• Quantum Phase Estimation with Entangled Photons produced by Parametric Down Conversion
• Statistics of multiphoton events in spontaneous parametric down-conversion
• Wigner-function theory and decoherence of the quantum-injected optical parametric amplifier
• Entanglement in SU(2)-invariant quantum systems: The positive partial transpose criterion and others
• State space structure and entanglement of rotationally invariant spin systems
• Realization of a Decoherence-free, Optimally Distinguishable Mesoscopic Quantum Superposition
• Non separable Werner states in spontaneous parametric down-conversion
• Entanglement criteria for microscopic-macroscopic systems
• Quantum discord of SU(2) invariant states
• Phase Estimation with Non-Unitary Interferometers: Information as a Metric
• Simple quantum model for light depolarization
• Anomalous resilient to decoherence macroscopic quantum superpositions generated by universally covariant optimal quantum cloning
• One-way deficit of SU(2) invariant states