22,690 research outputs found
Geomorphic and landform survey of northern Appennini
There are no author-identified significant results in this report
Generation of Rb-resonant bright two-mode squeezed light with four-wave mixing
Squeezed states of light have found their way into a number of applications
in quantum-enhanced metrology due to their reduced noise properties. In order
to extend such an enhancement to metrology experiments based on atomic
ensembles, an efficient light-atom interaction is required. Thus, there is a
particular interest in generating narrow-band squeezed light that is on atomic
resonance. This will make it possible not only to enhance the sensitivity of
atomic based sensors, but also to deterministically entangle two distant atomic
ensembles. We generate bright two-mode squeezed states of light, or twin beams,
with a non-degenerate four-wave mixing (FWM) process in hot Rb in a
double-lambda configuration. Given the proximity of the energy levels in the D1
line of Rb and Rb, we are able to operate the FWM in Rb in
a regime that generates two-mode squeezed states in which both modes are
simultaneously on resonance with transitions in the D1 line of Rb, one
mode with the to transition and the other one with the to
transition. For this configuration, we obtain an intensity difference
squeezing level of dB. Moreover, the intensity difference squeezing
increases to dB and dB when only one of the modes of the squeezed
state is resonant with the D1 to or to transition of
Rb, respectively
Quantization of classical integrable systems. Part IV: systems of resonant oscillators
By applying methods already discussed in a previous series of papers by the
same authors, we construct here classes of integrable quantum systems which
correspond to n fully resonant oscillators with nonlinear couplings. The same
methods are also applied to a series of nontrivial integral sets of functions,
which can be constructed when additional symmetries are present due to the
equality of some of the frequencies. Besides, for n=3 and resonance 1:1:2, an
exceptional integrable system is obtained, in which integrability is not
explicitly connected with this type of symmetry. In this exceptional case,
quantum integrability can be realized by means of a modification of the
symmetrization procedure.Comment: 23 page
More on softly broken N=2 QCD
We extend previous work on the soft breaking of supersymmetric QCD. We
present the formalism for the breaking due to a dilaton spurion for a general
gauge group and obtain the exact effective potential. We obtain some general
features of the vacuum structure in the pure Yang-Mills theory and we
also derive a general mass formula for this class of theories, in particular we
present explicit results for the mass spectrum in the case. Finally we
analyze the vacuum structure of the theory with one massless
hypermultiplet. This theory presents dyon condensation and a first order phase
transition in the supersymmetry breaking parameter driven by non-mutually local
BPS states. This could be a hint of Argyres-Douglas-like phases in
non-supersymmetric gauge theories.Comment: 35 pages, 9 Postscript figure
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