Securing QKD Links in the Full Hilbert Space

Authors:
Deborah J. Jackson;George M. Hockney
Affiliations:
Quantum Computing Technologies, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA 91109-8099;Quantum Computing Technologies, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA 91109-8099
Venue:
Quantum Information Processing
Year:
2005

Citing 1
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Abstract

Many quantum key distribution QKD analyses examine the link security in a subset of the full Hilbert space that is available to describe the system. In reality, information about the photon state can be embedded in correlations between the polarization space and other dimensions of the full Hilbert space in such a way that Eve can determine the polarization of a photon without affecting it. This paper uses the concept of suitability Hockney et al. "Suitability versus Fidelity for Rating Single Photon Guns" to quantify the available information for Eve to exploit, and demonstrate how it is possible for Alice and Bob to fool themselves into thinking they have a highly secure link.