Loss-resilient photonic entanglement swapping using optical hybrid states

Abstract

We propose a scheme of loss-resilient entanglement swapping between two distant parties via an imperfect optical channel. In this scheme, two copies of hybrid entangled states are prepared and the continuous-variable parts propagate through lossy media. In order to perform successful entanglement swapping, several different measurement schemes are considered for the continuousvariable parts such as single-photon detection for ideal cases and a homodyne detection for practical cases. We find that the entanglement swapping using hybrid states with small amplitudes offers larger entanglement than the discrete-variable entanglement swapping in the presence of large losses. Remarkably, this hybrid scheme still offers excellent robustness of entanglement to the detection inefficiency. Thus, the proposed scheme could be used for the practical quantum key distribution in hybrid optical states under photon losses.

7 pages, 3 figures

References in corpus (7)

• Generation of a superposition of odd photon number states for quantum information networks
• Quantum homodyne tomography of a two-photon Fock state
• Continuous-time cross-phase modulation and quantum computation
• Testing Quantum Devices: Practical Entanglement Verification in Bipartite Optical Systems
• Amplification of realistic cat-like states by homodyne heralding
• Quantum receivers with squeezing and photon-number-resolving detectors
• Adaptive Phase Measurements in Linear Optical Quantum Computation

Cited by in corpus (4)

• Satellite-based Distribution of Hybrid Entanglement
• Teleportation of Hybrid Entangled States with Continuous-Variable Entanglement
• Hybrid Photonic Loss Resilient Entanglement Swapping
• Converting between qubits of different forms