Simultaneous qubit-loss-free fusion of three multiple W states. (14th March 2018)

• Record Type: Journal Article
• Authors: Wang, Meiyu; Hao, Quanzhi; Yan, Fengli; Gao, Ting
• Is Part Of: Laser physics letters. Volume 15:Number 5(2018:May)
• Publication Date: 2018-03-14
• Subjects: W state fusion -- cross-Kerr nonlinearity -- positive-operator valued measurement (POVM); Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aaab77
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: Qubit-loss-free fusion for two W states introduced by Li K et al (2016 Phys. Rev . A94 062315) clearly increases the final size of the obtained W state and greatly reduces the number of fusion steps to achieve a W state of a target size. Motivated by this idea, we propose a qubit-loss-free fusion scheme for fusing three polarization entangled W states simultaneously. The elements of a two-outcome positive-operator valued measurement and the appropriate joint unitary operation for realizing a positive-operator valued measurement measurement are given. As an example, with the assistance of weak cross-Kerr nonlinearities, an optical setup for fusing three W states is proposed. We analyze the success probability of the scheme and the resource cost of the present scheme, as compared to previous work.