208 research outputs found
HEP experiments in Japan: The Next Generation
The HEP experiment in Japan is now stepping into next phase. J-PARC, which is a newly-built high intensity proton synchrotron facility, has started the operation recently. A new long-baseline neutrino experiment T2K is now at the commissioning stage utilizing the beam. In parallel, the upgrade of KEKB/Belle, a new generation B-factory experiment at KEK, is about to start. The accelerator will be upgraded to SuperKEKB whose luminosity is expected to be about 50 times higher. The detector is also upgraded to Belle II to keep up with the drastic increase. In this talk, a detailed review is given for these new experiments with some coverage of the readout and DAQ technologies
Measurements of time dependent CP asymmetry in decays with BELLE
A study of CP violation in decays by time
dependent angular analysis is discussed. Status of time independent analyses
for other decays is also reported. The data used for the analyses are
taken with the Belle detector at KEK.Comment: 4 pages, 3 figures, Proceeding of the talk in parallel session
(CP-3-5) at ICHEP2002, Amsterdam, Netherland, 24-31 July (2002
Photon polarization entanglement induced by biexciton: experimental evidence for violation of Bell's inequality
We have investigated the polarization entanglement between photon pairs
generated from a biexciton in a CuCl single crystal via resonant hyper
parametric scattering. The pulses of a high repetition pump are seen to provide
improved statistical accuracy and the ability to test Bell's inequality. Our
results clearly violate the inequality and thus manifest the quantum
entanglement and nonlocality of the photon pairs. We also analyzed the quantum
state of our photon pairs using quantum state tomography.Comment: 4 pages, 5 figure
Quantum diffraction and interference of spatially correlated photon pairs and its Fourier-optical analysis
We present one- and two-photon diffraction and interference experiments
involving parametric down-converted photon pairs. By controlling the divergence
of the pump beam in parametric down-conversion, the diffraction-interference
pattern produced by an object changes from a quantum (perfectly correlated)
case to a classical (uncorrelated) one. The observed diffraction and
interference patterns are accurately reproduced by Fourier-optical analysis
taking into account the quantum spatial correlation. We show that the relation
between the spatial correlation and the object size plays a crucial role in the
formation of both one- and two-photon diffraction-interference patterns.Comment: 10 pages, 13 figures, rev.
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