Bright photon pair source with high spectral and spatial purity

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Spontaneous parametric down-conversion (SPDC) is a reliable and robust source of photons for quantum information applications. For applications that involve operations such as entanglement swapping or single-photon heralding, two-photon states are required to be factorable (uncorrelated) in their spectral and spatial degrees of freedom. We report the design and experimental characterization of an SPDC source that has been optimized for high spectral and spatial purity. The source is pumped by the 776 nm output of a mode-locked Ti:Sapphire laser and consists of a periodically-poled Potassium Titanyl Phosphate (PPKTP) crystal phase-matched for collinear type-II SPDC. The dispersive properties of PPKTP at these wavelengths is such that it is possible to minimize the spectral entanglement by matching the widths of the pump to the spectral phase-matching function. The spatial entanglement is minimized through careful control of the pump focus, yielding nearly single-mode emission. An advantage of this approach is that the emission rate into the collection modes is very high, resulting in a very bright SPDC source. We also report a scheme that employs the output of collinear sources such as these to produce polarization-entangled photon pairs. The scheme, which requires only simple polarization elements, can be scaled to N-photon GHZ states.

Original languageEnglish
Title of host publicationQuantum Information and Computation IX
DOIs
StatePublished - 2011
EventQuantum Information and Computation IX - Orlando, FL, United States
Duration: Apr 28 2011Apr 29 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8057
ISSN (Print)0277-786X

Conference

ConferenceQuantum Information and Computation IX
Country/TerritoryUnited States
CityOrlando, FL
Period04/28/1104/29/11

Keywords

  • Down-conversion
  • Entanglement
  • Quantum information

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