171 research outputs found
The Interference Term in the Wigner Distribution Function and the Aharonov-Bohm Effect
A phase space representation of the Aharonov-Bohm effect is presented. It
shows that the shift of interference fringes is associated to the interference
term of the Wigner distribution function of the total wavefunction, whereas the
interference pattern is defined by the common projections of the Wigner
distribution functions of the interfering beamsComment: 10 pages, 4 figure
The Localized Quantum Vacuum Field
A model for the localized quantum vacuum is proposed in which the zero-point
energy of the quantum electromagnetic field originates in energy- and
momentum-conserving transitions of material systems from their ground state to
an unstable state with negative energy. These transitions are accompanied by
emissions and re-absorptions of real photons, which generate a localized
quantum vacuum in the neighborhood of material systems. The model could help
resolve the cosmological paradox associated to the zero-point energy of
electromagnetic fields, while reclaiming quantum effects associated with
quantum vacuum such as the Casimir effect and the Lamb shift; it also offers a
new insight into the Zitterbewegung of material particles.Comment: 21 pages, 1 figur
Phase Space Formulation of Quantum Mechanics. Insight into the Measurement Problem
A phase space mathematical formulation of quantum mechanical processes
accompanied by and ontological interpretation is presented in an axiomatic
form. The problem of quantum measurement, including that of quantum state
filtering, is treated in detail. Unlike standard quantum theory both quantum
and classical measuring device can be accommodated by the present approach to
solve the quantum measurement problemComment: 29 pages, 4 figure
Writing Electronic Devices on Paper with Carbon Nanotube Ink
The normal paper used in any printer is among the cheapest flexible organic
materials that exist. We demonstrate that we can print on paper high-frequency
circuits tunable with an applied dc voltage. This is possible with the help of
an ink containing functionalized carbon nanotubes and water. After the water is
evaporated from the paper, the nanotubes remain steadily imprinted on paper,
showing a semiconducting behaviour and tunable electrical properties
Optical analogue of population trapping in the continuum: classical and quantum interference effects
A quantum theory of light propagation in two optical channel waveguides
tunnelling-coupled to a common continuum of modes (such as those of a slab
waveguide) is presented, and classical and quantum interference effects are
investigated. For classical light, the photonic system realizes an optical
analogue of coherent population trapping in the continuum encountered in atomic
physics, where destructive interference between different light leakage
channels leads to the appearance of a trapped state embedded in the continuum.
For nonclassical light, two-photon interference effects are predicted, such as
the tendency of photon pairs to bunch when decaying into the continuum.Comment: 12 pages, 2 figure
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