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  Multimode states in decoy-based quantum-key-distribution protocols

Helwig, W., Mauerer, W., & Silberhorn, C. (2009). Multimode states in decoy-based quantum-key-distribution protocols. PHYSICAL REVIEW A, 80(5): 052326. doi:10.1103/PhysRevA.80.052326.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-6B9D-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-6B9E-F
Genre: Journal Article

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 Creators:
Helwig, Wolfram1, Author
Mauerer, Wolfgang2, Author              
Silberhorn, Christine2, Author              
Affiliations:
1external, ou_persistent22              
2Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364718              

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Free keywords: CRYPTOGRAPHY; SECURITYOptics; Physics; cryptographic protocols; Poisson distribution; quantum cryptography; quantum optics;
 Abstract: Every security analysis of quantum-key distribution (QKD) relies on a faithful modeling of the employed quantum states. Many photon sources, such as for instance a parametric down-conversion (PDC) source, require a multimode description but are usually only considered in a single-mode representation. In general, the important claim in decoy-based QKD protocols for indistinguishability between signal and decoy states does not hold for all sources. We derive bounds on the single-photon transmission probability and error rate for multimode states and apply these bounds to the output state of a PDC source. We observe two opposing effects on the secure key rate. First, the multimode structure of the state gives rise to a new attack that decreases the key rate. Second, more contributing modes change the photon number distribution from a thermal toward a Poissonian distribution, which increases the key rate.

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Language(s): eng - English
 Dates: 2009
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Degree: -

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Title: PHYSICAL REVIEW A
Source Genre: Journal
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Publ. Info: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA : AMER PHYSICAL SOC
Pages: - Volume / Issue: 80 (5) Sequence Number: 052326 Start / End Page: - Identifier: ISSN: 1050-2947