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Title: Bright Photon Pair Source with High Spectral and Spatial Purity

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.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; Work for Others (WFO)
OSTI Identifier:
1023853
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: SPIE Defense Security and Sensing: Quantum Information and Computation IX, Orlando, FL, USA, 20110425, 20110425
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DEGREES OF FREEDOM; DESIGN; LASERS; PHOSPHATES; PHOTONS; POLARIZATION; POTASSIUM; QUANTUM INFORMATION; SECURITY; WAVELENGTHS

Citation Formats

Schaake, Jason, Bennink, Ryan S, Evans, Philip G, Grice, Warren P, and Humble, Travis S. Bright Photon Pair Source with High Spectral and Spatial Purity. United States: N. p., 2011. Web.
Schaake, Jason, Bennink, Ryan S, Evans, Philip G, Grice, Warren P, & Humble, Travis S. Bright Photon Pair Source with High Spectral and Spatial Purity. United States.
Schaake, Jason, Bennink, Ryan S, Evans, Philip G, Grice, Warren P, and Humble, Travis S. Sat . "Bright Photon Pair Source with High Spectral and Spatial Purity". United States.
@article{osti_1023853,
title = {Bright Photon Pair Source with High Spectral and Spatial Purity},
author = {Schaake, Jason and Bennink, Ryan S and Evans, Philip G and Grice, Warren P and Humble, Travis S},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/1023853}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {1}
}

Conference:
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