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Continuous-Variable Entanglement Swapping

Department of Physics, University of Toronto, Toronto, M5S 1A7, Canada
QKD Corp., 60 St. George St., Toronto, M5S 1A7, Canada
Author to whom correspondence should be addressed.
Entropy 2015, 17(5), 3152-3159;
Received: 26 March 2015 / Revised: 1 May 2015 / Accepted: 4 May 2015 / Published: 13 May 2015
(This article belongs to the Special Issue Quantum Cryptography)
PDF [217 KB, uploaded 13 May 2015]


We present a very brief overview of entanglement swapping as it relates to continuous-variable quantum information. The technical background required is discussed and the natural link to quantum teleportation is established before discussing the nature of Gaussian entanglement swapping. The limitations of Gaussian swapping are introduced, along with the general applications of swapping in the context of to quantum communication and entanglement distribution. In light of this, we briefly summarize a collection of entanglement swapping schemes which incorporate a non-Gaussian ingredient and the benefits of such schemes are noted. Finally, we motivate the need to further study and develop such schemes by highlighting requirements of a continuous-variable repeater. View Full-Text
Keywords: continuous variables; entanglement swapping; quantum teleportation continuous variables; entanglement swapping; quantum teleportation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Marshall, K.; Weedbrook, C. Continuous-Variable Entanglement Swapping. Entropy 2015, 17, 3152-3159.

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