Processing signals using entanglement-assisted communication

Abstract

Processing codewords comprises: receiving encoded signals associated with reference signals related by quantum entanglement, where the encoded signals have been encoded with respective phases corresponding to symbols of a particular codeword; performing a first nonlinear optical process with inputs comprising a first signal derived from the encoded signals and a first signal derived from the reference signals; performing a second nonlinear optical process with inputs comprising a second signal derived from the encoded signals and a signal derived from a first output of the first nonlinear optical process; performing a first linear optical process with inputs comprising a signal derived from a second output of the first nonlinear optical process and a signal derived from a first output of the second nonlinear optical process; and processing information that includes signals derived from one or more outputs of the first linear optical process to generate an estimate of the particular codeword.