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Proceedings Paper

Multi-client quantum key distribution using wavelength division multiplexing
Author(s): W. Grice; R. Bennink; D. Earl; P. Evans; T. Humble; R. Pooser; J. Schaake; B. Williams
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Paper Abstract

Quantum Key Distribution (QKD) exploits the rules of quantum mechanics to generate and securely distribute a random sequence of bits to two spatially separated clients. Typically a QKD system can support only a single pair of clients at a time, and so a separate quantum link is required for every pair of users. We overcome this limitation with the design and characterization of a multi-client entangled-photon QKD system with the capacity for up to 100 clients simultaneously. The time-bin entangled QKD system includes a broadband down-conversion source with two unique features that enable the multi-user capability. First, the photons are emitted across a very large portion of the telecom spectrum. Second, and more importantly, the photons are strongly correlated in their energy degree of freedom. Using standard wavelength division multiplexing (WDM) hardware, the photons can be routed to different parties on a quantum communication network, while the strong spectral correlations ensure that each client is linked only to the client receiving the conjugate wavelength. In this way, a single down-conversion source can support dozens of channels simultaneously--and to the extent that the WDM hardware can send different spectral channels to different clients, the system can support multiple client pairings. We will describe the design and characterization of the down-conversion source, as well as the client stations, which must be tunable across the emission spectrum.

Paper Details

Date Published: 7 September 2011
PDF: 7 pages
Proc. SPIE 8163, Quantum Communications and Quantum Imaging IX, 81630B (7 September 2011); doi: 10.1117/12.893788
Show Author Affiliations
W. Grice, Oak Ridge National Lab. (United States)
The Univ. of Tennessee (United States)
R. Bennink, Oak Ridge National Lab. (United States)
D. Earl, Oak Ridge National Lab. (United States)
P. Evans, Oak Ridge National Lab. (United States)
T. Humble, Oak Ridge National Lab. (United States)
R. Pooser, Oak Ridge National Lab. (United States)
J. Schaake, Oak Ridge National Lab. (United States)
The Univ. of Tennessee (United States)
B. Williams, Oak Ridge National Lab. (United States)
The Univ. of Tennessee (United States)


Published in SPIE Proceedings Vol. 8163:
Quantum Communications and Quantum Imaging IX
Ronald E. Meyers; Yanhua Shih; Keith S. Deacon, Editor(s)

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