A simple scheme is proposed to implement a two-qubit linear optical quantum iSWAP gate that is a universal gate in quantum computation and quantum information processing. By the interference effect of the polarized photons, a quantum iSWAP gate can be achieved with a low success probability (η4/32, with η being the quantum efficiency of photon detectors). The scheme is based only on simple linear optical elements, a pair of two-photon polarization entangled states, and conventional photon detectors that only distinguish the vacuum and nonvacuum Fock number states, which greatly decreases the experimental difficulty of implementing linear optical quantum computation.
© 2009 Optical Society of America
Original Manuscript: August 25, 2009
Revised Manuscript: October 28, 2009
Manuscript Accepted: November 2, 2009
Published: December 11, 2009
Hong-Fu Wang, Xiao-Qiang Shao, Yong-Fang Zhao, Shou Zhang, and Kyu-Hwang Yeon, "Scheme for implementing linear optical quantum iSWAP gate with conventional photon detectors," J. Opt. Soc. Am. B 27, 27-31 (2010)