Direct temporal mode measurement of photon pairs by stimulated emission

Measurement of Direct Photon Emission in K1 ! p1p0g Decay

S. Adler,1 M. Aoki,5,* M. Ardebili,4 M. S. Atiya,1 P. C. Bergbusch,5,7 E. W. Blackmore,5 D. A. Bryman,5,7 I.-H. Chiang,1 M. R. Convery,4 M. V. Diwan,1 J. S. Frank,1 J. S. Haggerty,1 T. Inagaki,2 M. M. Ito,4 S. Kabe,2 S. H. Kettell,1 Y. Kishi,3 P. Kitching,6 M. Kobayashi,2 T. K. Komatsubara,2 A. Konaka,5 Y. Kuno,2 M. Kuriki,2 T. F. Kycia,1, K. K. Li,1 L. S. Littenberg,1 J. A. Macdonald,5 R. A. M...

Temporal dynamics of photon pairs generated by an atomic ensemble.

The time dependence of nonclassical correlations is investigated for two fields (1,2) generated by an ensemble of cold cesium atoms via the protocol of Duan et al. [Nature (London) 414, 413 (2001)]]. The correlation function R(t1,t2) for the ratio of cross to autocorrelations for the (1,2) fields at times (t1,t2) is found to have a maximum value R(max=292+/-57, which significantly violates the ...

Frequency-upconverted stimulated emission by simultaneous five-photon absorption

Since the invention of the laser in 1960, multiphoton effects have become useful in techniques for real applications as well as conceptual predictions. Here, we report the first experimental observation of frequency-upconverted stimulated emission from a novel fluorophore through simultaneous five-photon absorption. Compared to lower-order nonlinear absorption, the fifth-order dependence on inp...

Direct measurement of the Wigner function by photon counting

Among many representations of the quantum state, the Wigner function offers an appealing possibility to describe quantum phenomena using the classical-like concept of phase space [1]. The Wigner function provides complete information on the state of a system, and it allows one to evaluate any quantum observable by phase space integration with an appropriate Wigner-Weyl ordered expression. Recen...

Measurement of direct photon emission in K + → π + π 0 γ decay using stopped positive kaons