One-step deterministic polarization entanglement purification using spatial entanglement

Details One-step deterministic polarization entanglement purification using spatial entanglement One-step deterministic polarization entanglement purification using spatial entanglement

2010-08-20

arxiv.org/abs/1008.3509v2

Phys. Rev. A 82, 044305 (2010)

Physics

Quantum Physics

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

Scientific paper

10.1103/PhysRevA.82.044305

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.

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