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Title: Witnessing trustworthy single-photon entanglement with local homodyne measurements
Authors: Morin, O.
Bancal, J.-D.
Ho, M. 
Sekatski, P.
D'Auria, V.
Gisin, N.
Laurat, J.
Sangouard, N.
Issue Date: 25-Mar-2013
Citation: Morin, O., Bancal, J.-D., Ho, M., Sekatski, P., D'Auria, V., Gisin, N., Laurat, J., Sangouard, N. (2013-03-25). Witnessing trustworthy single-photon entanglement with local homodyne measurements. Physical Review Letters 110 (13) : -. ScholarBank@NUS Repository.
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. © 2013 American Physical Society.
Source Title: Physical Review Letters
ISSN: 00319007
DOI: 10.1103/PhysRevLett.110.130401
Appears in Collections:Staff Publications

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