336 research outputs found
Waveguide propagation of light in polymer porous films filled with nematic liquid crystals
We theoretically analyze the waveguide regime of light propagation in a
cylindrical pore of a polymer matrix filled with liquid crystals assuming that
the effective radial optical anisotropy is biaxial. From numerical analysis of
the dispersion relations, the waveguide modes are found to be sensitive to the
field-induced changes of the anisotropy. The electro-optic properties of the
polymer porous polyethylene terephthalate (PET) films filled with the nematic
liquid crystal 5CB are studied experimentally and the experimental results are
compared with the results of the theoretical investigation.Comment: 15 pages, 10 figures, revtex4-
Vector parameters in atomic ionization by twisted light: polarization of electron and residual ion
The electron and ion properties observed in a photoionization inherit a
symmetry properties of both a target and a radiation. Introducing a symmetry
breaking in a photoionization process one can expect to observe a noticeable
variation of the vector correlation parameters of either outgoing photoelectron
or a residual ion. One of the ways to violate symmetry is to irradiate a matter
by the twisted radiation which involves an additional screw.
In the paper we present the extension of the approach developed in [Phys.
Rev. A 108, 023117 (2023)] for the photoelectron angular distribution to the
other vector correlation parameters, exactly photoelectron spin polarization,
orientation and alignment of the residual ion. Usually two conditions are
needed to produce polarized photoelectrons: a system possesses a helix and a
noticeable spin-orbital interaction. In the paper we investigate if a twisted
light brings an additional helicity to a system. As an illustrative example we
consider ionization of valence -shell of atomic krypton by circularly and
linearly polarized Bessel light. The photoelectron spin components are analyzed
as a function of the cone angle of the twisted radiation
Quantum repeater via entangled phase modulated multimode coherent states
We present a scheme of quantum repeater that uses entangled multimode
coherent states which are obtained by electro-optic modulation of symmetric and
antisymmetric Schr\"odinger cat states. In this method subcarrier modes of the
phase modulated states generated by the remote parties are sent to a symmetric
beam splitter at the central node. The entangled coherent states are heraldedly
prepared by photon counting measurements at the output channels of the beam
splitter. We study how the effects of decoherence in the quantum channel affect
statistics of photocounts and corresponding fidelity. We show how the proposed
scheme can be useful for extending range of quantum key distribution with sub
carrier wave encoding by exploiting quantum teleportation with the generated
entanglement.Comment: 14 pages, 8 figure
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