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Eliminating spectral distinguishability in ultrafast spontaneous parametric down-conversion

Source: Phys. Rev. A 80, 043815 (2009); doi:10.1103/PhysRevA.80.043815

Published 14 October 2009

KEYWORDS and PACS
Keywords
PACS
  • 42.65.Lm
    Parametric down conversion and production of entangled photons
  • 03.67.Mn
    Entanglement measures, witnesses, and other characterizations (quantum information)
  • YEAR: 2009
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PUBLICATION DATA
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Hou Shun Poh,1 Jiaqing Lim,1 Ivan Marcikic,2 Antía Lamas-Linares,1 and Christian Kurtsiefer1
1Centre for Quantum Technologies and Department of Physics, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
2Temasek Laboratories, National University of Singapore, Singapore 117508, Singapore
Generation of polarization-entangled photon pairs with a precise timing through down-conversion of femtosecond pulses is often faced with a degraded polarization entanglement quality. In a previous experiment, we have shown that this degradation is induced by spectral distinguishability between the two decay paths, in accordance with theoretical predictions. Here, we present an experimental study of the spectral compensation scheme proposed and first implemented by Kim and Grice [J. Mod. Opt. 49, 2309 (2002)]. By measuring the joint spectral properties of the polarization correlations of the photon pairs, we show that the spectral distinguishability between the down-converted components is eliminated. This scheme results in a polarization visibility of 97.9±0.5% without any spectral filtering. ©2009 The American Physical Society
History: Received 23 May 2009; published 14 October 2009
Permalink: http://link.aps.org/abstract/PRA/v80/e043815

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