Implementation of an efficient linear-optical quantum router

TL;DR

This paper presents an experimental implementation of a highly efficient linear-optical quantum router that coherently routes single-photon qubits into two outputs with maintained polarization, achieving a record success probability.

Contribution

It introduces the most efficient linear-optical quantum router to date, with a success probability up to 25%, and demonstrates coherent routing of polarization-encoded qubits.

Findings

Achieved a success probability of up to 25%.

Maintained polarization state during routing.

Demonstrated coherent routing of single-photon qubits.

Abstract

In this paper, we report on experimental implementation of a linear-optical quantum router. Our device allows single-photon polarization-encoded qubits to be routed coherently into two spatial output modes depending on the state of two identical control qubits. The polarization qubit state of the routed photon is maintained during the routing operation. The success probability of our scheme can be increased up to 25% making it the most efficient linear-optical quantum router known to this date.