Distinguishability of Gaussian states in quantum cryptography using postselection

Weedbrook, Christian, Alton, Daniel J., Symul, Thomas, Lam, Ping Kom and Ralph, Timothy C. (2009) Distinguishability of Gaussian states in quantum cryptography using postselection. Physical Review A (Atomic, Molecular and Optical Physics), 79 6: 062311.1-062311.11. doi:10.1103/PhysRevA.79.062311

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Author Weedbrook, Christian
Alton, Daniel J.
Symul, Thomas
Lam, Ping Kom
Ralph, Timothy C.
Title Distinguishability of Gaussian states in quantum cryptography using postselection
Journal name Physical Review A (Atomic, Molecular and Optical Physics)   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2009-06-15
Year available 2009
Sub-type Article (original research)
DOI 10.1103/PhysRevA.79.062311
Open Access Status File (Publisher version)
Volume 79
Issue 6
Start page 062311.1
End page 062311.11
Total pages 11
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract We consider the distinguishability of Gaussian states from the viewpoint of continuous-variable quantum cryptography using postselection. Specifically, we use the probability of error to distinguish between two pure coherent (squeezed) and two particular mixed symmetric coherent (squeezed) states where each mixed state is an incoherent mixture of two pure coherent (squeezed) states with equal and opposite displacements in the conjugate quadrature. We show that the two mixed symmetric Gaussian states (where the various components have the same real part) never give an eavesdropper more information than the two pure Gaussian states. Furthermore, when considering the distinguishability of squeezed states, we show that varying the amount of squeezing leads to a “squeezing” and “antisqueezing” of the net information rates.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Optics
Physics
OPTICS
PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article #062311

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
2010 Higher Education Research Data Collection
ERA 2012 Admin Only
 
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Created: Thu, 03 Sep 2009, 17:49:47 EST by Mr Andrew Martlew on behalf of Physics