Spectral effects of strong X(2) nonlinearity for quantum processing

Leung, Patrick M., Munro, William J., Nemoto, Kae and Ralph, Timothy C. (2009) Spectral effects of strong X(2) nonlinearity for quantum processing. Physical Review A, 79 4: 042307-1-042307-8. doi:10.1103/PhysRevA.79.042307

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Author Leung, Patrick M.
Munro, William J.
Nemoto, Kae
Ralph, Timothy C.
Title Spectral effects of strong X(2) nonlinearity for quantum processing
Formatted title
Spectral effects of strong X(2) nonlinearity for quantum processing
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2009-04-06
Year available 2009
Sub-type Article (original research)
DOI 10.1103/PhysRevA.79.042307
Open Access Status File (Publisher version)
Volume 79
Issue 4
Start page 042307-1
End page 042307-8
Total pages 8
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2010
Language eng
Abstract Optical χ(2) nonlinearity can be used for parametric amplification and producing down-converted entangled photon pairs that have broad applications. It is known that weak nonlinear media exhibit dispersion and produce a frequency response. It is therefore of interest to know how spectral effects of a strong χ(2) crystal affect the performance. Here we model the spectral effects of the dispersion of a strong χ(2) crystal and illustrate how this affects its ability to perform Bell measurements and influence the performance of a quantum gates that employ such a Bell measurement. We show that a Dyson series expansion of the unitary operator is necessary in general, leading to unwanted spectral entanglement. We identify a limiting situation employing periodic poling, in which a Taylor series expansion is a good approximation and this entanglement can be removed.
Keyword Bell theorem
State
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
2010 Higher Education Research Data Collection
 
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Created: Thu, 03 Sep 2009, 08:08:32 EST by Mr Andrew Martlew on behalf of Physics