In this paper, we present a simple scheme for adding independent single photons to the existed W state one by one, and then the size of W state will be expanded. Only one CNOT operation and one discrimination operation are enough for expanding $$n$$ n -photon W state to $$(n+1)$$ ( n + 1 ) -photon W state, with the success probability $$(n+1)/2n$$ ( n + 1 ) / 2 n . No single photons will be detected, and no more entangled resources are necessary. If further operations are performed, the success probability can be increased as considered. Moreover, with $$m$$ m CNOT operations and one complicate discrimination process, $$m$$ m -independent single photons can be added simultaneously.
Quantum Information Processing – Springer Journals
Published: May 21, 2015
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