Journal
LASER PHYSICS LETTERS
Volume 15, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1612-202X/aaab77
Keywords
W state fusion; cross-Kerr nonlinearity; positive-operator valued measurement (POVM)
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Funding
- National Natural Science Foundation of China [11475054, 11371005]
- Hebei Natural Science Foundation of China [A2016205145, A2018205125]
- Education Department of Hebei Province Natural Science Foundation [QN2017089]
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Qubit-loss-free fusion for two W states introduced by Li K et al (2016 Phys. Rev. A 94 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.
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