Free-space quantum key distribution in daylight

Richard J. Hughes, William T. Buttler, Paul G. Kwiat, Steve K. Lamoreaux, George L. Morgan, Jane E. Nordholt, C. Glen Peterson

Research output: Contribution to journalArticle

Abstract

Quantum cryptography is an emerging technology in which two parties may simultaneously generate shared, secret cryptographic key material using the transmission of quantum states of light. The security of these transmissions is based on the inviolability of the laws of quantum mechanics and information-theoretically secure post-processing methods. An adversary can neither successfully tap the quantum transmissions, nor evade detection, owing to Heisenberg's uncertainty principle. In this paper we describe the theory of quantum cryptography, and the most recent results from our experimental free-space system with which we have demonstrated for the first time the feasibility of quantum key generation over a point-to-point outdoor atmospheric path in daylight. We achieved a transmission distance of 0.5 km, which was limited only by the length of the test range. Our results provide strong evidence that cryptographic key material could be generated on demand between a ground station and a satellite (or between two satellites), allowing a satellite to be securely re-keyed in orbit. We present a feasibility analysis of surface-to-satellite quantum key generation.

Original languageEnglish (US)
Pages (from-to)549-562
Number of pages14
JournalJournal of Modern Optics
Volume47-2
Issue number3
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Hughes, R. J., Buttler, W. T., Kwiat, P. G., Lamoreaux, S. K., Morgan, G. L., Nordholt, J. E., & Peterson, C. G. (2000). Free-space quantum key distribution in daylight. Journal of Modern Optics, 47-2(3), 549-562. https://doi.org/10.1080/09500340008244059