Generation of large scale GHZ states with the interactions of photons and quantum-dot spins. (9th February 2018)

• Record Type: Journal Article
• Authors: Miao, Chun; Fang, Shu-Dong; Dong, Ping; Yang, Ming; Cao, Zhuo-Liang
• Is Part Of: Laser physics letters. Volume 15:Number 3(2018:Mar.)
• Publication Date: 2018-02-09
• Subjects: large scale particle -- quantum-dot spin -- double-side microcavity -- GHZ State; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aa9d0a
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: We present a deterministic scheme for generating large scale GHZ states in a cavity-quantum dot system. A singly charged quantum dot is embedded in a double-sided optical microcavity with partially reflective top and bottom mirrors. The GHZ-type Bell spin state can be created and two n -spin GHZ states can be perfectly fused to a 2 n -spin GHZ state with the help of n ancilla single-photon pulses. The implementation of the current scheme only depends on the photon detection and its need not to operate multi-qubit gates and multi-qubit measurements. Discussions about the effect of the cavity loss, side leakage and exciton cavity coupling strength for the fidelity of generated states show that the fidelity can remain high enough by controlling system parameters. So the current scheme is simple and feasible in experiment.