Joint Temporal Density Measurements for Two-Photon State Characterization

被引：80

作者：

Kuzucu, Onur ^{[1
]}

Wong, Franco N. C. ^{[1
]}

Kurimura, Sunao ^{[2
]}

Tovstonog, Sergey ^{[2
]}

机构：

[1] MIT, Elect Res Lab, Cambridge, MA 02139 USA

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.101.153602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate a technique for characterizing two-photon quantum states based on joint temporal correlation measurements using time-resolved single-photon detection by femtosecond up-conversion. We measure for the first time the joint temporal density of a two-photon entangled state, showing clearly the time anticorrelation 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.

引用

页数：4

共 19 条

[1] Nonlinear interactions with an ultrahigh flux of broadband entangled photons [J].