Joint Temporal Density Measurements for Two-Photon State Characterization
Abstract
We demonstrate a new technique for characterizing two-photon quantum states based on joint temporal correlation measurements using time resolved single photon detection by femtosecond upconversion. We measure for the first time the joint temporal density of a two-photon entangled state, showing clearly the time anti-correlation of the coincident-frequency entangled photon pair generated by ultrafast spontaneous parametric down-conversion under extended phase-matching conditions. The new technique enables us to manipulate the frequency entanglement by varying the down-conversion pump bandwidth to produce a nearly unentangled two-photon state that is expected to yield a heralded single-photon state with a purity of 0.88. The time-domain correlation technique complements existing frequency-domain measurement methods for a more complete characterization of photonic entanglement in quantum information processing.
Cite
@article{arxiv.0807.1573,
title = {Joint Temporal Density Measurements for Two-Photon State Characterization},
author = {Onur Kuzucu and Franco N. C. Wong and Sunao Kurimura and Sergey Tovstonog},
journal= {arXiv preprint arXiv:0807.1573},
year = {2009}
}
Comments
4 pages, 5 figures