en
Scientific article
Open access
English

Witnessing Trustworthy Single-Photon Entanglement with Local Homodyne Measurements

Published inPhysical review letters, vol. 110, no. 13
Publication date2013
Abstract

Single-photon entangled states, i.e., states describing two optical paths sharing a single photon, constitute the simplest form of entanglement. Yet they provide a valuable resource in quantum information science. Specifically, they lie at the heart of quantum networks, as they can be used for quantum teleportation, swapped, and purified with linear optics. The main drawback of such entanglement is the difficulty in measuring it. Here, we present and experimentally test an entanglement witness allowing one to say whether a given state is path entangled and also that entanglement lies in the subspace, where the optical paths are each filled with one photon at most, i.e., refers to single-photon entanglement. It uses local homodyning only and relies on no assumption about the Hilbert space dimension of the measured system. Our work provides a simple and trustworthy method for verifying the proper functioning of future quantum networks.

Citation (ISO format)
MORIN, Olivier Jacques et al. Witnessing Trustworthy Single-Photon Entanglement with Local Homodyne Measurements. In: Physical review letters, 2013, vol. 110, n° 13. doi: 10.1103/PhysRevLett.110.130401
Main files (1)
Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal0031-9007
633views
492downloads

Technical informations

Creation05/12/2014 4:32:00 PM
First validation05/12/2014 4:32:00 PM
Update time03/14/2023 9:13:12 PM
Status update03/14/2023 9:13:11 PM
Last indexation01/16/2024 9:59:18 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack