Joint Temporal Density Measurements for Two-Photon State Characterization
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 clea...
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| creator | Kuzucu, Onur Wong, Franco N C Kurimura, Sunao Tovstonog, Sergey |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.0807.1573 |
| format | Article |
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| source | Freely Accessible Journals; arXiv.org |
| subjects | Correlation analysis Data processing Density Measurement methods Phase matching Photonics Physics - Quantum Physics Quantum entanglement Quantum phenomena Quantum theory Time domain analysis Upconversion |
| title | Joint Temporal Density Measurements for Two-Photon State Characterization |
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