Abstract
An effective scheme is proposed for preparing large-scale maximally entangled W states by fusing arbitrary-size polarization entangled W or W-like states via polarization-dependent beam splitter (PDBS). In our scheme, Wm+n−1 state can be generated from an n-qubit W state and an m-qubit W state, and Wm+n+t−2 state can be generated from Wm, Wn and Wt states. The fusion process can start with Bell states too. Because PDBS has selective transmission rates for different polarization states, our fusion has a distinct property, i.e. a large-scale maximally entangled W state can be generated by fusing small-size W-like states, and the cost analyses indicate that our fusion scheme is more efficient than the previous one in fusing W-like states. In addition, there is no need for any controlled quantum gate and any ancillary photon in our scheme, so it is simple and feasible.
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