336 research outputs found
Efficient W state entanglement concentration using quantum-dot and optical microcavities
We present an entanglement concentration protocols (ECPs) for less-entangled
W state with quantum-dot and microcavity coupled system. The present protocol
uses the quantum nondemolition measurement on the spin parity to construct the
parity check gate. Different from other ECPs, this less-entangled W state with
quantum-dot and microcavity coupled system can be concentrated with the help of
some single photons. The whole protocol can be repeated to get a higher success
probability. It may be useful in current quantum information processing.Comment: 9 pages, 6 figure
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