Quantum parallel dense coding of optical images
Authors: Golubeva, T. YU.1; Golubev, YU. M.1; Sokolov, I. V.1; Kolobov, M. I.2
Source: Journal of Modern Optics, Volume 53, Numbers 5-6, March-April 2006 , pp. 699-711(13)
Publisher: Taylor and Francis Ltd
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Abstract:
We propose quantum dense coding protocol for optical images. This protocol extends the earlier proposed dense coding scheme for continuous variables [S.L. Braunstein and H.J. Kimble, Phys. Rev. A 61 042302 (2000)] to an essentially multimode in space and time optical quantum communication channel. This new scheme allows, in particular, for parallel dense coding of non-stationary optical images. Similar to some other quantum dense coding protocols, our scheme exploits the possibility of sending a message through only one of the two entangled spatially-multimode beams, using the other one as a reference system. We evaluate the Shannon mutual information for our protocol and find that it is superior to the standard quantum limit. Finally, we show how to optimize the performance of our scheme as a function of the spatio-temporal parameters of the multimode entangled light and of the input images.Document Type: Research article
DOI: 10.1080/09500340500217506
Affiliations: 1: V.A. Fock Physics Institute, St Petersburg State University, 198504 Petrodvorets, St Petersburg, Russia 2: Laboratoire PhLAM, Université de Lille-1, F-59655 Villeneuve d'Ascq cedex, France
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