Abstract
This paper presents an optimal entanglement concentration protocol (ECP) for entangled solid-state systems, using the coherent-state input–output process working in the low- cavity quantum electrodynamics regime. The solid-state system can be described as a three-level atom confined in a one-side optical microcavity. Using the ancillary coherent optical pulse to perform the cavity input–output process, different state-dependent phase shifts of the output coherent state can be discriminated by homodyne detection, and a less-entangled atomic pair can be concentrated to maximally entangled state in a certain probability between two remote parties nonlocally. By repeating the concentration process, the remote parties can further obtain a higher success probability. Compared with conventional ECPs, only one pair of less-entangled atoms is needed in the proposed protocol, and the coherent-state input–output process is working in a low- cavity in the atom–cavity intermediate coupling region. With feasible technologies, this protocol may be widely used in quantum repeaters and long-distance quantum communication.
© 2013 Optical Society of America
Full Article | PDF ArticleMore Like This
Cong Cao, Chuan Wang, Ling-yan He, and Ru Zhang
Opt. Express 21(4) 4093-4105 (2013)
Lan Zhou, Yu-Bo Sheng, and Xing-Fu Wang
J. Opt. Soc. Am. B 31(3) 503-511 (2014)
Yu-Bo Sheng and Lan Zhou
J. Opt. Soc. Am. B 30(3) 678-686 (2013)