Generation of pulsed polarization-entangled two-photon state via temporal and spectral engineering

Yoon Ho Kim, Warren P. Grice

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

The quantum state of the photon pair generated from type-II spontaneous parametric downconversion pumped by an ultrafast laser pulse exhibits strong decoherence in its polarization entanglement, an effect which can be attributed to the clock effect of the pump pulse or, equivalently, to distinguishing spectral information in the two-photon state. Here, we propose novel temporal and spectral engineering techniques to eliminate these detrimental decoherence effects. The temporal engineering of the two-photon wavefunction results in a universal Bell-state synthesizer that is independent of the choice of pump source, crystal parameters, wavelengths of the interacting photons and the bandwidth of the spectral filter. In the spectral engineering technique, the distinguishing spectral features of the two-photon state are eliminated through modifications to the two-photon source. In addition, spectral engineering also provides a means for the generation of polarization-entangled states with novel spectral characteristics: the frequency-correlated state and the frequency-uncorrelated state.

Original languageEnglish
Pages (from-to)2309-2323
Number of pages15
JournalJournal of Modern Optics
Volume49
Issue number14-15
DOIs
StatePublished - Nov 20 2002

Funding

We would like to thank M.V. Chekhova, S.P. Kulik, M.H. Rubin and Y. Shih for helpful discussions. This research was supported in part by the US Department of Energy, Office of Basic Energy Sciences. The Oak Ridge National Laboratory is managed for the US Department of Energy by UT-Battelle, LLC, under contract DE-AC05-00OR22725.

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