Optimal photons for quantum-information processing

Rohde, Peter P., Ralph, Timothy C. and Nielsen, Michael A. (2005) Optimal photons for quantum-information processing. Physical Review A, 72 5: 052332-1-052332-6. doi:10.1103/PhysRevA.72.052332

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Author Rohde, Peter P.
Ralph, Timothy C.
Nielsen, Michael A.
Title Optimal photons for quantum-information processing
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2005
Sub-type Article (original research)
DOI 10.1103/PhysRevA.72.052332
Open Access Status File (Publisher version)
Volume 72
Issue 5
Start page 052332-1
End page 052332-6
Total pages 6
Editor B. Crasemann
Place of publication United States
Publisher American Physical Society
Collection year 2005
Language eng
Subject C1
240301 Atomic and Molecular Physics
780102 Physical sciences
Abstract Photonic quantum-information processing schemes, such as linear optics quantum computing, and other experiments relying on single-photon interference, inherently require complete photon indistinguishability to enable the desired photonic interactions to take place. Mode-mismatch is the dominant cause of photon distinguishability in optical circuits. Here we study the effects of photon wave-packet shape on tolerance against the effects of mode mismatch in linear optical circuits, and show that Gaussian distributed photons with large bandwidth are optimal. The result is general and holds for arbitrary linear optical circuits, including ones which allow for postselection and classical feed forward. Our findings indicate that some single photon sources, frequently cited for their potential application to quantum-information processing, may in fact be suboptimal for such applications.
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 06:48:06 EST