One-step deterministic polarization entanglement purification using spatial entanglement

Abstract

We present a one-step deterministic entanglement purification protocol with linear optics and postselection. Compared with the Simon-Pan protocol (Phys. Rev. Lett. 89, 257901 (2002)), this one-step protocol has some advantages. First, it can get a maximally entangled pair with only one step, not only improve the fidelity of less-entangled photon pairs by performing the protocol repeatedly. Second, it works in a deterministic way, not a probabilistic one, which will reduce a great deal of entanglement resources. Third, it does not require the polarization state be entangled, only spatial entanglement is needed. Moreover, it is feasible with current techniques (Nature 423, 417 (2003)). All these advantages will make this one-step protocol more convenient than others in the applications in quantum communication.

5 pages, 1 figures. A negligible error about the density matrix ρ"_p in Eq. (9) is corrected

References in corpus (10)

• Quantum Cryptography
• Long-distance quantum communication with atomic ensembles and linear optics
• Purification of Noisy Entanglement and Faithful Teleportation via Noisy Channels
• Quantum privacy amplification and the security of quantum cryptography over noisy channels
• Feasible Entanglement Purification for Quantum Communication
• Symmetric multiparty-controlled teleportation of an arbitrary two-particle entanglement
• Efficient polarization entanglement purification based on parametric down-conversion sources with cross-Kerr nonlinearity
• Polarization Entanglement Purification using Spatial Entanglement
• Multi-Particle Entanglement Purification Protocols
• Robust creation of entanglement between remote memory qubits

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