559 research outputs found
Cavity QED with Multiple Hyperfine Levels
We calculate the weak-driving transmission of a linearly polarized cavity
mode strongly coupled to the D2 transition of a single Cesium atom. Results are
relevant to future experiments with microtoroid cavities, where the
single-photon Rabi frequency g exceeds the excited-state hyperfine splittings,
and photonic bandgap resonators, where g is greater than both the excited- and
ground-state splitting.Comment: 6 pages, 10 figure
Dynamics of genuine multipartite correlations in open quantum systems
We propose a measure for genuine multipartite correlations suited for the
study of dynamics in open quantum systems. This measure is contextual in the
sense that it depends on how information is read from the environment. It is
used to study an interacting collective system of atoms undergoing phase
transitions as external parameters are varied. We show that the steady state of
the system can have a significant degree of genuine multipartite quantum and
classical correlations, and that the proposed measure can serve as a witness of
critical behavior in quantum systems.Comment: 5 pages, 3 figure
Interaction of a two-level atom with squeezed light
We consider a degenerate parametric oscillator whose cavity contains a
two-level atom. Applying the Heisenberg and quantum Langevin equations, we
calculate in the bad-cavity limit the mean photon number, the quadrature
variance, and the power spectrum for the cavity mode in general and for the
signal light and fluorescent light in particular. We also obtain the normalized
second-order correlation function for the fluorescent light. We find that the
presence of the two-level atom leads to a decrease in the degree of squeezing
of the signal light. It so turns out that the fluorescent light is in a
squeezed state and the power spectrum consists of a single peak only.Comment: 9 pages and 9 figures, in press, Opt. Commu
Generation of two-mode nonclassical states and a quantum phase gate operation in trapped ion cavity QED
We propose a scheme to generate nonclassical states of a quantum system,
which is composed of the one-dimensional trapped ion motion and a single cavity
field mode. We show that two-mode SU(2) Schr\"odinger-cat states, entangled
coherent states, two-mode squeezed vacuum states and their superposition can be
generated. If the vibration mode and the cavity mode are used to represent
separately a qubit, a quantum phase gate can be implemented.Comment: to appear in PR
Understanding Women’s Experiences of Defending Against Eating Disorder Symptoms: An Interpretive Phenomenological Analysis
Counter-Intuitive Vacuum-Stimulated Raman Scattering
Vacuum-stimulated Raman scattering in strongly coupled atom-cavity systems
allows one to generate free-running single photon pulses on demand. Most
properties of the emitted photons are well defined, provided spontaneous
emission processes do not contribute. Therefore, electronic excitation of the
atom must not occur, which is assured for a system adiabatically following a
dark state during the photon-generation process. We experimentally investigate
the conditions that must be met for adiabatic following in a time-of-flight
driven system, with atoms passing through a cavity and a pump beam oriented
transverse to the cavity axis. From our results, we infer the optimal intensity
and relative pump-beam position with respect to the cavity axis.Comment: 4 pages, 4 figure
Omnidirectional scattering of ultrasonic waves from rough surfaces of known statistics with application to electromagnetic scattering
Directional properties of ultrasonic waves scattered from rough surfaces with applications to electromagnetic scatterin
de-Broglie Wave-Front Engineering
We propose a simple method for the deterministic generation of an arbitrary
continuous quantum state of the center-of-mass of an atom. The method's spatial
resolution gradually increases with the interaction time with no apparent
fundamental limitations. Such de-Broglie Wave-Front Engineering of the atomic
density can find applications in Atom Lithography, and we discuss possible
implementations of our scheme in atomic beam experiments.Comment: The figures' quality was improved, the text remains intact. 5 pages,
3 figures; submitted to PR
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