351 research outputs found
Nonlinear coherent loss for generating non-classical states
Here we discuss generation of non-classical states of bosonic mode with the
help of artificially designed loss, namely the nonlinear coherent loss. We show
how to generate superpositions of Fock states, and how it is possible to "comb"
the initial states leaving only states with certain properties in the resulting
superposition (for example, a generation of a superposition of Fock states with
odd number of particles). We discuss purity of generated states and estimate
maximal achievable generation fidelity
Quantum Teleportation Using Quantum Non-Demolition Technique
We propose a new scheme and protocol for quantum teleportation of a
single-mode field state, based on entanglement produced by quantum
non-demolition interaction. We show that the recently attained results in QND
technique allow to perform the teleportation in quantum regime. We also show
that applying QND coupling to squeezed fields will significantly improve the
quality of teleportation for a given degree of squeezing.Comment: 4 pages RevTeX, 2 figure
New periodic solutions for three or four identical vortices on a plane and a sphere
In this paper we describe new classes of periodic solutions for point
vortices on a plane and a sphere. They correspond to similar solutions
(so-called choreographies) in celestial mechanics.Comment: 15 pages, 6 figure
Afterpulsing model based on the quasi-continuous distribution of deep levels in single-photon avalanche diodes
We have performed a statistical characterization of the effect of
afterpulsing in a free-running silicon single-photon detector by measuring the
distribution of afterpulse waiting times in response to pulsed illumination and
fitting it by a sum of exponentials. We show that a high degree of goodness of
fit can be obtained for 5 exponentials, but the physical meaning of estimated
characteristic times is dubious. We show that a continuous limit of the sum of
exponentials with a uniform density between the limiting times gives excellent
fitting results in the full range of the detector response function. This means
that in certain detectors the afterpulsing is caused by a continuous band of
deep levels in the active area of the photodetector.Comment: 10 pages, 4 figure
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