One-step deterministic polarization-entanglement purification using spatial entanglement

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.044305· OSTI ID:21452620

Yubo, Sheng ^[1]; Fuguo, Deng ^[1]

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1. Department of Physics, Beijing Normal University, Beijing 100875 (China)

We present a one-step deterministic entanglement purification protocol with linear optics and postselection. Compared with the Simon-Pan protocol [C. Simon and J. W. Pan, Phys. Rev. Lett. 89, 257901 (2002)], this one-step protocol has some advantages. First, it can obtain a maximally entangled pair from each photon pair with only one step, instead of improving the fidelity of less-entangled photon pairs by performing the entanglement purification process repeatedly in other protocols. Second, it works in a deterministic way, not a probabilistic one, which greatly reduces the number of entanglement resources needed. Third, it does not require the polarization state be entangled; only spatial entanglement is needed. Moreover, it is feasible with current techniques [J. W. Pan, S. Gasparonl, R. Ursin, G. Weihs, and A. Zellinger, Nature (London) 423, 417 (2003)]. All these advantages make this one-step protocol more convenient than others in quantum-communication applications.

• OSTI ID: 21452620
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOSONS
CALCULATION METHODS
COMMUNICATIONS
DATA TRANSMISSION
ELEMENTARY PARTICLES
MASSLESS PARTICLES
MECHANICS
OPTICS
PHOTONS
POLARIZATION
PROBABILISTIC ESTIMATION
PURE STATES
PURIFICATION
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUANTUM STATES