285 research outputs found
Response to "Comment on `Quantum-confinement effects on the optical and dielectric properties for mesocrystals of BaTiO3 and SrBi2Ta2O9\u27"
In this reply, the authors show that the argument by Scott regarding the band gap of bulk SrBi2Ta2O9 (SBT) is not based on concrete evidence. The authors will also show additional data from a Raman study of a powdered SBT sample to prove that the surface of the specimen was not covered by Bi2O3
Dilepton production near partonic threshold in transversely polarized proton-antiproton collisions
It has recently been suggested that collisions of transversely polarized
protons and antiprotons at the GSI could be used to determine the nucleon's
transversity densities from measurements of the double-spin asymmetry for the
Drell-Yan process. We analyze the role of higher-order perturbative QCD
corrections in this kinematic regime, in terms of the available fixed-order
contributions as well as of all-order soft-gluon resummations. We find that the
combined perturbative corrections to the individual unpolarized and
transversely polarized cross sections are large. We trace these large
enhancements to soft gluon emission near partonic threshold, and we suggest
that with a physically-motivated cut-off enhancements beyond lowest order are
moderated relative to resummed perturbation theory, but still significant. The
unpolarized dilepton cross section for the GSI kinematics may therefore provide
information on the relation of perturbative and nonperturbative dynamics in
hadronic scattering. The spin asymmetry turns out to be rather robust,
relatively insensitive to higher orders, resummation, and the cut-offs.Comment: 23 pages, 19 figures as eps. Some discussion and references added.
Final version to appear in Phys. Rev.
Detection-dependent six-photon NOON state interference
NOON state interference (NOON-SI) is a powerful tool to improve the phase
sensing precision, and can play an important role in quantum sensing and
quantum imaging. However, most of the previous NOON-SI experiments only
investigated the center part of the interference pattern, while the full range
of the NOON-SI pattern has not yet been well explored.In this Letter, we
experimentally and theoretically demonstrate up to six-photon NOON-SI and study
the properties of the interference patterns over the full range.The
multi-photons were generated at a wavelength of 1584 nm from a PPKTP crystal in
a parametric down conversion process.It was found that the shape, the coherence
time and the visibility of the interference patterns were strongly dependent on
the detection schemes.This experiment can be used for applications which are
based on the envelope of the NOON-SI pattern, such as quantum spectroscopy and
quantum metrology.Comment: 5 pages, 3 figure
Response to "Comment on `Quantum-confinement effects on the optical and dielectric properties for mesocrystals of BaTiO3 and SrBi2Ta2O9
In this reply, the authors show that the argument by Scott regarding the band gap of bulk SrBi2Ta2O9 (SBT) is not based on concrete evidence. The authors will also show additional data from a Raman study of a powdered SBT sample to prove that the surface of the specimen was not covered by Bi2O3
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