Remote preparation of three-photon entangled states via single-photon measurement

TL;DR

This paper demonstrates a novel remote state preparation method for three-photon entangled states using only single-photon measurement, enabling more practical quantum state engineering for quantum information applications.

Contribution

The authors introduce a new protocol for remote preparation of multi-photon entangled states via single-photon measurement, overcoming previous limitations requiring measurements on all photons.

Findings

Successfully prepared three-photon entangled states remotely with single-photon measurement.

Generalized protocol for multi-photon entangled state preparation with arbitrary photon number.

Enabled quantum state engineering beyond the linear optical limit.

Abstract

Remote state preparation (RSP) provides an indirect way of manipulating quantum information based on the nonlocal effect of quantum measurement. Although RSP has been demonstrated in recent years to remotely prepare multi-photon states, quantum measurement on the same number of photons was required, i.e., to prepare N-photon states via RSP, quantum measurement on the other N-photons was required, hence significantly limiting practicality and applicability of RSP. Here we report the first experimental demonstration of remote preparation of three-photon entangled states by measuring only a single-photon entangled with the three photons. We further generalize our protocol to prepare multi-photon entangled states with arbitrary photon number and purity via single-photon measurement. As our RSP scheme relies on the nonlinearity induced by single-photon measurement, it enables quantum state engineering of multi-photon entangled states beyond the linear optical limit. Our results are expected to have significant impacts on quantum metrology and quantum information processing.