Entanglement distillation for quantum communication network with atomic-ensemble memories

Abstract

Atomic ensembles are effective memory nodes for quantum communication network due to the long coherence time and the collective enhancement effect for the nonlinear interaction between an ensemble and a photon. Here we investigate the possibility of achieving the entanglement distillation for nonlocal atomic ensembles by the input-output process of a single photon as a result of cavity quantum electrodynamics. We give an optimal entanglement concentration protocol (ECP) for two-atomic-ensemble systems in a partially entangled pure state with known parameters and an efficient ECP for the systems in an unknown partially entangled pure state with a nondestructive parity-check detector (PCD). For the systems in a mixed entangled state, we introduce an entanglement purification protocol with PCDs. These entanglement distillation protocols have high fidelity and efficiency with current experimental techniques, and they are useful for quantum communication network with atomic-ensemble memories.

13 pages, 7 figures, one column

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Cited by in corpus (5)

• Error-rejecting quantum computing with solid-state spins assisted by low-Q optical microcavities
• Resource-efficient analyzer of Bell and Greenberger-Horne-Zeilinger states of multiphoton systems
• Self-error-rejecting photonic qubit transmission in polarization-spatial modes with linear optical elements
• Entanglement concentration of microwave photons based on Kerr effect in circuit QED
• High dimensional entanglement between a photon and a multiplexed atomic quantum memory