W Optical apparatus for efficient generation of multipartite N-qubit W entangled state

摘要

Disclosed is an efficient optical apparatus for generating N W quantum entanglements from an independent photon. The optical apparatus according to the present invention can comprise: N qubit inputs; N optical splitting parts each connected to N qubit input terminals; an auxiliary qubit input terminal; the auxiliary qubit input terminal and 1 × N multiple ports; N qubit output terminals each connected to the N optical splitting parts and a first optical channel and connected to the 1 x N multiple ports; an N × N multiple port connected to the N optical splitting parts through the second optical channel; and a photon detector connected to at least one output port of the N output ports of the N × N multiple port.