Evan Meyer-Scott

Abstract Multiphoton entangled quantum states are key to advancing quantum technologies such as multiparty quantum communications, quantum sensing, or quantum computation. Their scalable generation, however, remains an experimental challenge. Current methods for generating these states rely on stitching together photons from probabilistic sources, and state generation rates drop exponentially in the number of photons.

The simplest way to create a discorrelated state (Fig. 1) is to impinge a single photon |1? and a coherent state |?? on two ports of a 50:50?beam splitter. The coherent state displaces the single photon34, resulting in the entangled two-mode state where the coefficients are given by and the normalization factor is .