Effects of spectral entanglement in polarization-entanglement swapping and type-I fusion gates

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Travis S. Humble and Warren P. Grice
Center for Engineering Science Advanced Research, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6015, USA

Received 10 October 2007; published 11 February 2008

Weexamine how spectral entanglement in polarization-entangled photon states generated frombulk-crystal, spontaneous parametric down-conversion affects the success of entanglement swappingand type-I fusion gates. We quantify the success of theentanglement swapping and fusion gates by calculating the bipartite concurrenceand residual tangle, respectively, in terms of the joint spectralprobability amplitudes of the initial broad-bandwidth polarization-entangled states. We findthat both polarization-entanglement measures depend strongly on the initial spectralentanglement, as well as on the configuration of the independentsources. Specifically, when spectral differences correlate with polarization, the optimalsource configuration is different for the two protocols. We concludethat this distinction is founded in how the underlying Bell-statemeasurement and quantum-erasure techniques respond differently to distinguishing spectral information.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.77.022312
DOI:	10.1103/PhysRevA.77.022312
PACS:	03.67.Mn; 03.65.Ud; 42.50.Dv; 42.65.Lm 03.67.Mn Entanglement measures, witnesses, and other characterizations (quantum information) 03.65.Ud Entanglement and quantum nonlocality 42.50.Dv Quantum state engineering and measurements (quantum optics) 42.65.Lm Parametric down conversion and production of entangled photons YEAR: 2008
KEYWORDS:	information theory, protocols, quantum entanglement, quantum gates, quantum optics

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