Purification of single-photon entanglement with linear optics

Nicolas Sangouard; Christoph Simon; T. Coudreau; Nicolas Gisin

doi:10.1103/physreva.78.050301

Abstract

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We show that single-photon entangled states of the form $\ensuremath{\mid}0⟩\ensuremath{\mid}1⟩+\ensuremath{\mid}1⟩\ensuremath{\mid}0⟩$ can be purified with a simple linear-optics-based protocol, which is eminently feasible with current technology. Besides its conceptual interest, this result is relevant for attractive quantum repeater protocols.

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