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9 papers · 2 filters
Entanglement-assisted scheme for nondemolition detection of the presence of a single photon
Marek Bula, Karol Bartkiewicz, Antonín Černoch +1
In this paper, we propose a resources-optimal linear-optical scheme for quantum nondemolition detection of single-photon presence. By measuring the state of ancillary photons, the…
Linear-optical programmable quantum router
Karel Lemr, Antonín Černoch
This paper presents a scheme for linear-optical implementation of a programmable quantum router. Polarization encoded photon qubit is coherently routed to various spatial modes acc…
Entangling efficiency of linear-optical quantum gates
Karel Lemr, Antonín Černoch, Jan Soubusta +1
We propose a new measure of non-classicality of quantum gates which is particularly suitable for probabilistic devices. This measure enables to compare, e.g., deterministic devices…
Spatial and spectral properties of the pulsed second-harmonic generation in a PP-KTP waveguide
Radek Machulka, Jiří Svozilík, Jan Soubusta +2
Spatial and spectral properties of the pulsed second harmonic generation in a periodically-poled KTP waveguide exploiting simultaneously the first, second, and third harmonics of p…
Absolute detector calibration using twin beams
Jan Perina, Ondrej Haderka, Vaclav Michalek +1
A method for the determination of absolute quantum detection efficiency is suggested based on the measurement of photocount statistics of twin beams. The measured histograms of joi…
Coulomb potential and the paradoxes of PT-symmetrization
Miloslav Znojil
Besides the standard quantum version of the Coulomb/Kepler problem, an alternative quantum model with not too dissimilar phenomenological (i.e., spectral and scattering) as well as…