Realizing an efficient fusion gate for W states with cross Kerr nonlinearities and QD cavity coupled system
We propose a new scheme for fusing two arbitrary size photonic W states encoded by polarizations to generate a larger W state. With the help of cross Kerr nonlinearities and a quantum dot in an optical cavity (QD cavity coupled system) we can realize the fusion of W states with a high success probability. In addition, the scheme does not need any ancillary photon, and it can also be applied to fuse two Bell states. The scheme can be realized with current experimental technology.
Quantum Inf. Process.