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Passive Decoy-State Quantum Key Distribution with Coherent Light

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hdl:2117/78820

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Curty, Marcos
Jofre Cruanyes, MarcMés informacióMés informacióMés informació
Pruneri, Valerio
Mitchell, Morgan W.
Document typeArticle
Defense date2015-06-12
PublisherMDPI
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Signal state preparation in quantum key distribution schemes can be realized using either an active or a passive source. Passive sources might be valuable in some scenarios; for instance, in those experimental setups operating at high transmission rates, since no externally driven element is required. Typical passive transmitters involve parametric down-conversion. More recently, it has been shown that phase-randomized coherent pulses also allow passive generation of decoy states and Bennett–Brassard 1984 (BB84) polarization signals, though the combination of both setups in a single passive source is cumbersome. In this paper, we present a complete passive transmitter that prepares decoy-state BB84 signals using coherent light. Our method employs sum-frequency generation together with linear optical components and classical photodetectors. In the asymptotic limit of an infinite long experiment, the resulting secret key rate (per pulse) is comparable to the one delivered by an active decoy-state BB84 setup with an infinite number of decoy settings.
URIhttp://hdl.handle.net/2117/78820
ISSN1099-4300
Publisher versionhttp://www.mdpi.com/1099-4300/17/6/4064
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  • Optoelectronics - Articles de revista [23]
  • Quantum information with cold atoms and non-classical light - Articles de revista [5]
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