Splitting of quantum information in traveling wave fields using only linear optical elements

TL;DR

This paper proposes a practical linear optical scheme for splitting quantum information in traveling wave fields, enabling high-fidelity quantum state manipulation despite detector inefficiencies.

Contribution

It introduces a feasible linear optical method for quantum information splitting and a simple scheme for generating W states for teleportation and superdense coding.

Findings

High-fidelity quantum information splitting achievable with linear optics

Scheme tolerates detector inefficiencies and beam splitter absorption

Generation of W states useful for quantum communication

Abstract

In this brief report we present a feasible scheme to split quantum information in the realm of traveling waves. An oversimplified scheme is also proposed for the generation of a class of W states useful for perfect teleportation and superdense coding. The scheme employs only linear optical elements as beam splitters and phase shifters, in addition to photon counters and one-photon sources. It is shown that splitting of quantum information with high fidelity is possible even including inefficiency of the detectors and photoabsorption of the beam splitters.