1,932 research outputs found
Optical homodyne detection in view of joint probability distribution
Optical homodyne detection is examined in view of joint probability
distribution. It is usually discussed that the relative phase between
independent laser fields are localized by photon-number measurements in
interference experiments such as homodyne detection. This provides reasoning to
use operationally coherent states for laser fields in the description of
homodyne detection and optical quantum-state tomography. Here, we elucidate
these situations by considering the joint probability distribution and the
invariance of homodyne detection under the phase transformation of optical
fields.Comment: 8 pages, 2 figures; REVTeX 4.
Photon creation in a resonant cavity with a nonstationary plasma mirror and its detection with Rydberg atoms
We investigate the dynamical Casimir effect and its detection with Rydberg
atoms. The photons are created in a resonant cavity with a plasma mirror of a
semiconductor slab which is irradiated by periodic laser pulses. The canonical
Hamiltonian is derived for the creation and annihilation operators showing the
explicit time-variation in the couplings, which originates from the external
configuration such as a nonstationary plasma mirror. The number of created
photons is evaluated as squeezing from the Heisenberg equations with the
Hamiltonian. Then, the detection of the photons as the atomic excitations is
examined through the atom-field interaction. Some consideration is made for a
feasible experimental realization with a semiconductor plasma mirror.Comment: 8 pages, 2 figure
Gluino-mediated electroweak penguin with flavor-violating trilinear couplings
In light of a discrepancy of the direct violation in
decays, , we investigate gluino contributions to
the electroweak penguin, where flavor violations are induced by squark
trilinear couplings. Top-Yukawa contributions to observables are
taken into account, and vacuum stability conditions are evaluated in detail. It
is found that this scenario can explain the discrepancy of
for the squark mass smaller than 5.6 TeV. We also
show that the gluino contributions can amplify , and . Such large effects could be measured in future
experiments.Comment: 30 pages, 8 figures; references added, version published in JHE
- …