2,074 research outputs found
Too poor to move, to poor to stay: a report on housing in the Czech Republic, Hungary and Serbia
A delayed choice quantum eraser explained by the transactional interpretation of quantum mechanics
This paper explains the delayed choice quantum eraser of Kim et al. in terms
of the transactional interpretation of quantum mechanics by John Cramer. It is
kept deliberately mathematically simple to help explain the transactional
technique. The emphasis is on a clear understanding of how the instantaneous
"collapse" of the wave function due to a measurement at a specific time and
place may be reinterpreted as a gradual collapse over the entire path of the
photon and over the entire transit time from slit to detector. This is made
possible by the use of a retarded offer wave, which is thought to travel from
the slits (or rather the small region within the parametric crystal where
down-conversion takes place) to the detector and an advanced counter wave
traveling backward in time from the detector to the slits. The point here is to
make clear how simple the Cramer transactional picture is and how much more
intuitive the collapse of the wave function becomes if viewed in this way. Also
any confusion about possible retro-causal signaling is put to rest. A delayed
choice quantum eraser does not require any sort of backward in time
communication. This paper makes the point that it is preferable to use the
Transactional Interpretation (TI) over the usual Copenhagen Interpretation (CI)
for a more intuitive understanding of the quantum eraser delayed choice
experiment. Both methods give exactly the same end results and can be used
interchangeably.Comment: 24 pages 4 figures, fifth draf
A jet in a crossflow
In the transition from hover to wingborn flight, V/STOL aircraft rely on the direct thrust of lift jets to supplement wing generated lift. The lifting jets interact with the flow over the aerodynamic surface to produce a complex flow around the aircraft. The simplest configuration which retains the essential characteristics of the jet/aerodynamic-surface interaction problem is a subsonic round jet exhausting perpendicularly through a large flat plate into a uniform crossflow. This configuration was studied extensively, both by experiment and by analysis. As a result, a fairly complete experiment data base exists for comparison with the numerical calculations. Research publications and presentations in this area are included. Each citation is followed by an abstract of the work
Quantum teleportation of a single-photon wave packet
A quantum teleportation scheme based on the EPR-pair entangled with respect
to the ``energy+time'' variables is proposed. Teleportation of the multimode
state of a single-photon wave packet is considered.Comment: 6 pages, no figure
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