157 research outputs found
Quantum Interference in the Kirkwood-Rihaczek representation
We discuss the Kirkwood-Rihaczek phase space distribution and analyze a whole
new class of quasi-distributions connected with this function. All these
functions have the correct marginals. We construct a coherent state
representation of such functions, discuss which operator ordering corresponds
to the Kirkwood-Rihaczek distribution and their generalizations, and show how
such states are connected to squeezed states. Quantum interference in the
Kirkwood-Rihaczek representation is discussed.Comment: 10 pages, 7 figure
Talbot effect in cylindrical waveguides
We extend the theory of Talbot revivals for planar or rectangular geometry to
the case of cylindrical waveguides. We derive a list of conditions that are
necessary to obtain revivals in cylindrical waveguides. A phase space approach
based on the Wigner and the Kirkwood-Rihaczek functions provides a pictorial
representation of TM modes interference associated with the Talbot effect
Selecting the lorenz parameters for wideband radar waveform generation
Radar waveforms based on chaotic systems have occasionally been suggested for a variety of radar applications. In this paper, radar waveforms are constructed with solutions from a particular chaotic system, the Lorenz system, and are called Lorenz waveforms. Waveform properties, which include the peak autocorrelation function side-lobe and the transmit power level, are related to the system parameters of the Lorenz system. Additionally, scaling the system parameters is shown to correspond to an approximate time and amplitude scaling of Lorenz waveforms and also corresponds to scaling the waveform bandwidth. The Lorenz waveforms can be generated with arbitrary time lengths and bandwidths and each waveform can be represented with only a few system parameters. Furthermore, these waveforms can then be systematically improved to yield constant-envelope output waveforms with low autocorrelation function sidelobes and limited spectral leakage.United States. Air Force Office of Scientific Research (Contract number FA8721-05-C-0002
Hydrogen atom in phase space. The Kirkwood-Rihaczek representation
We present a phase-space representation of the hydrogen atom using the
Kirkwood-Rikaczek distribution function. This distribution allows us to obtain
analytical results, which is quite unique because an exact analytical form of
the Wigner functions corresponding to the atom states is not known. We show how
the Kirkwood-Rihaczek distribution reflects properties of the hydrogen atom
wave functions in position and momentum representations.Comment: 5 pages (and 5 figures
Quasi light fields: extending the light field to coherent radiation
Imaging technologies such as dynamic viewpoint generation are engineered for
incoherent radiation using the traditional light field, and for coherent
radiation using electromagnetic field theory. We present a model of coherent
image formation that strikes a balance between the utility of the light field
and the comprehensive predictive power of Maxwell's equations. We synthesize
research in optics and signal processing to formulate, capture, and form images
from quasi light fields, which extend the light field from incoherent to
coherent radiation. Our coherent cameras generalize the classic beamforming
algorithm in sensor array processing, and invite further research on
alternative notions of image formation.Comment: This paper was published in JOSA A. The final version is available on
the OSA website:
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-26-9-205
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