Entangling the Whole by Beam Splitting a Part
Croal C, Peuntinger C, Chille V, Marquardt C, Leuchs G, Korolkova N, Mista L (2015)
Publication Type: Journal article
Publication year: 2015
Journal
Book Volume: 115
Article Number: 190501
Journal Issue: 19
DOI: 10.1103/PhysRevLett.115.190501
Abstract
A beam splitter is a basic linear optical element appearing in many optics experiments and is frequently used as a continuous-variable entangler transforming a pair of input modes from a separable Gaussian state into an entangled state. However, a beam splitter is a passive operation that can create entanglement from Gaussian states only under certain conditions. One such condition is that the input light is suitably squeezed. We demonstrate, experimentally, that a beam splitter can create entanglement even from modes which do not possess such a squeezing provided that they are correlated to, but not entangled with, a third mode. Specifically, we show that a beam splitter can create three-mode entanglement by acting on two modes of a three-mode fully separable Gaussian state without entangling the two modes themselves. This beam splitter property is a key mechanism behind the performance of the protocol for entanglement distribution by separable states. Moreover, the property also finds application in collaborative quantum dense coding in which decoding of transmitted information is assisted by interference with a mode of the collaborating party.
Authors with CRIS profile
Involved external institutions
University of St Andrews
United Kingdom (GB)
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
Germany (DE)
Palacky University Olomouc / Univerzita Palackého v Olomouci
Czech Republic (CZ)
United Kingdom (GB)
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
Germany (DE)
Palacky University Olomouc / Univerzita Palackého v Olomouci
Czech Republic (CZ)
How to cite
APA:
Croal, C., Peuntinger, C., Chille, V., Marquardt, C., Leuchs, G., Korolkova, N., & Mista, L. (2015). Entangling the Whole by Beam Splitting a Part. Physical Review Letters, 115(19). https://doi.org/10.1103/PhysRevLett.115.190501
MLA:
Croal, Callum, et al. "Entangling the Whole by Beam Splitting a Part." Physical Review Letters 115.19 (2015).
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