Physics – Quantum Physics
Scientific paper
2008-07-10
Physics
Quantum Physics
4 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.101.153602
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.
Kurimura Sunao
Kuzucu Onur
Tovstonog Sergey
Wong Franco N. C.
No associations
LandOfFree
Joint Temporal Density Measurements for Two-Photon State Characterization does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Joint Temporal Density Measurements for Two-Photon State Characterization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Joint Temporal Density Measurements for Two-Photon State Characterization will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-459349