Integrating a single Fredkin (controlled swap) gate to the previously introduced W state fusion mechanism (Ozdemir , New J. Phys. NJOPFM 1367-2630 10.1088/1367-2630/13/10/103003 13 , 103003 ( 2011 ) ) and using an ancillary photon, we increase the size of the fused W states and essentially, we improve the success probability of the fusion process in a promising way for a possible deterministic W -state fusion mechanism. Besides fusing arbitrary size W states, our setup can also fuse Bell states to create W states with a success probability 3 / 4 which is much higher than the previous works. Therefore using only this setup, it is now possible to start with Bell pairs to create and expand arbitrary size W states. Since a higher probability of success implies a lower cost of resource in terms of the number of the states spent to achieve a target size, our setup gives rise to more cost-efficient scenarios.
Physical Review A – American Physical Society (APS)
Published: Mar 25, 2013
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