Quantum operational measurement of amplitude and phase parameters for SU(3)-symmetry optical field

We consider a new approach to describe a quantum optical Bose-system with internal Gell-Mann symmetry by the SU(3)-symmetry polarization map in Hilbert space. The operational measurement in density (or coherency) matrix elements for the three mode optical field is discussed for the first time. We have introduced a set of operators that describes the quantum measurement procedure and the behavior of fluctuations for the amplitude and phase characteristics of three level system. The original twelve-port interferometer for parallel measurements of the Gell-Mann parameters is proposed. The quantum properties of W-qutrit states under the measurement procedure are examined.Comment: 11 pages, 2 eps-figures, uses iopart.cl

Lasing and high temperature phase transitions in atomic systems with dressed state polaritons

We consider the fundamental problem of high temperature phase transitions in the system of high density two-level atoms off-resonantly interacting with a pump field in the presence of optical collisions (OCs) and placed in the cavity. OCs are considered in the framework of thermalization of atomic dressed state (DS) population. For the case of a strong atom-field coupling condition we analyze the problem of thermodynamically equilibrium superradiant phase transition for the order parameter representing a real amplitude of cavity mode and taking place as a result of atomic DSs thermalization process. Such transition is also connected with condensed (coherent) properties of low branch (LB) DS-polaritons occurring in the cavity. For describing non-equilibrium phase transitions we derive Maxwell-Bloch like equations which account for cavity decay rate, collisional decay rate and spontaneous emission. Various aspects of transitions to laser field formation by using atomic DS levels for both positive and negative detuning of a pump field from atomic transition frequency are studied in detail. It is revealed, that for positive atom-light detuning DS lasing can be obtained in the presence of quasi-equilibrium DS population that corresponds to a true two-level atomic system with the inversion in nonresonant limit.Comment: 12 pages, 8 figure

Quantum storage and cloning of light states in EIT-like medium

In the paper we consider a new approach for storage and cloning of quantum information by three level atomic (molecular) systems in the presence of the electromagnetically induced transparency (EIT) effect. For that, the various schemes of transformation into the bright and dark polaritons for quantum states of optical field in the medium are proposed. Physical conditions of realization of quantum nondemolition (QND) storage of quantum optical state are formulated for the first time. We have shown that the best storage and cloning of can be achieved with the atomic ensemble in the Bose-Einstein condensation state. We discuss stimulated Raman two-color photoassociation for experimental realization of the schemes under consideration

Low-Mass (M<1.2 Gev/c^2) Sigma0 - Meson Produced in the System Pi+Pi- from the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2

The production and properties of the resonances in the system of Pi+Pi- were studied in the reaction np --> npPi+Pi- at the momentum of incident neutrons Pn=(5.20 +/- 0.12)GeV/c. In this work in comparison with previous ones we made more hard selection of events taking into account track measurement precise. In the distribution of the Pi+Pi- combinations effective masses we have found 8 peculiarities. All the observable peculiarities have spins equal to zero. There were no corresponding picks in the Pi-PI- and Pi-Pi0 - systems in the reactions np --> npPi+Pi- Pi- and np --> npPi-Pi0. So, we have observed a row of resonances with a set of quantum numbers 0+(0++) -- SIGMA0 - mesons decaying on the channel SIGMA0 --> Pi+Pi-. The obtained in other experiments masses coincide with the sequence of masses observed in our experiment. Especially good coincidence can be obtained in the K-matrix approach (see RPP).Comment: 6 pages, 3 figures, 1 tables; Presented at XVIII ISHEPP "Relativistic Nuclear Physics and Quantum Chromodynamics" JINR, Dubna, Russia, September, 200

Quantum statistics of light emitted from a pillar microcavity

A quantum behavior of the light emitted by exciton polaritons excited in a pillar semiconductor microcavity with embedded quantum well is investigated. Considering the bare excitons and photon modes as coupled quantum oscillators allows for an accurate accounting of the nonlinear and dissipative effects. In particular, using the method of quantum states presentation in a quantum phase space via quasiprobability functions (namely, a $P$-function and a Wigner function), we study the effect of the laser and the exciton-photon detuning on the second order correlation function of the emitted photons. We determine the conditions for the phenomena of bunching, giant bunching, and antibunching of the emitted light. In particular, we predict the effect of a giant bunching for the case of a large exciton to photon population ratio. Within the domain of parameters supporting a bistability regime we demonstrate the effect of bunching of photons.Comment: 9 pages, 6 figure

Barionic Resonances with Positive Strangeness S=+1 in the System nK+ from the Reaction np -> npK+K- at the Momentum of Incident Neutrons Pn=5.20 Gev/c

The production and properties of the resonances with the strangeness S=+1 in the system of nK+ were studied in the reaction np->npK+K- at the momentum of incident neutrons Pn=(5.20 +/- 0.12)GeV/c. A number of peculiarities were found in the effective mass spectrum of the mentioned above system. Their widths are comparable with the mass resolution. The estimation of the spins of resonances was carried out and the rotational band connecting the resonances masses and their spins was constructed.Comment: 6 pages, 3 figures, 4 tables; Presented at XVIII ISHEPP "Relativistic Nuclear Physics and Quantum Chromodynamics" JINR, Dubna, Russia, September, 200

The Search and Study of Low-Mass Scalar Mesons in the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2

Using irradiation of a 1-meter Hydrogen Bubble Chamber (LHE JINR) by a quasimonochromatic neutron beam with impulse Pn=(5.20 +/- 0.12)GeV/c produced after acceleration of deuterons in the synchrophasotron (LHE JINR) 2560 events of reaction np-->npPi+Pi- were selected. After supplementary sorting out the events where a secondary proton flies forward in the general c.m.s. of reaction in the effective mass spectrum of Pi+Pi- - combinations, there were nine peculiarities found out at masses 350, 408, 489, 579, 676, 762, 878, 1036, 1170 MeV/c^2 with experimental widths not more than several tens of MeV/c^2. The resonance effects grow too much after using an additional criterion - balance of the sum of the longitudinal impulse of Pi+ and Pi--mesons in the general c.m.s. of the reaction. Under these conditions the values of a standard derivation from the background are (5 - 7.5). The direct measurement of the spin of resonances was carried out. Also other quantum numbers were obtained. All of these peculiarities have a similar set of quantum numbers I^G(J^(PC))=0+(0++). This way the sequence of scalar-izoscalar resonances f0(SIGMA0) with masses in the range of M<M1200 MeV/c^2 are to be seen. There is no information about these resonances in the literature. The phenomenological dependence for the resonance mass from its number was found. This dependence covered not only resonances shown in this paper but also all those which are present in PDG tables with quantum numbers f0(SIGMA0) - mesons.Comment: 11 pages, 11 figures, 4 tables; Presented at XIX ISHEPP (JINR, Dubna, Russia, September, 2008). English version of JINR prepr. P1-2008-100. Submitted to Yad.Fi

Hyperbolic Metamaterials with Bragg Polaritons

We propose a novel mechanism for designing quantum hyperbolic metamaterials with use of semi-conductor Bragg mirrors containing periodically arrangedquantum wells. The hyperbolic dispersion of exciton-polariton modes is realized near the top of the first allowed photonic miniband in such structure which leads to formation of exciton-polariton X-waves. Exciton-light coupling provides a resonant non-linearity which leads to non-trivial topologic solutions. We predict formation of low amplitude spatially localized oscillatory structures: oscillons described by kink shaped solutions of the effective Ginzburg-Landau-Higgs equation. The oscillons have direct analogies in the gravita-tional theory. We discuss implementation of exciton-polariton Higgs fields for the Schrodinger cat state generation

Quantum metrology beyond Heisenberg limit with entangled matter wave solitons

By considering matter wave bright solitons from weakly coupled Bose-Einstein condensates trapped in a double-well potential, we study the formation of macroscopic non-classical states, including Schr\"odinger-cat superposition states and maximally path entangled $N00N$-states. With these macroscopic states, we examine Mach-Zehnder interferometer in the context of parity measurements, in order to obtain Heisenberg limit accuracy for linear phase shift measurement. We reveal that the ratio between two-body scattering length and intra-well hopping parameter can be measured with the scaling beyond this limit by using nonlinear phase shift with interacting quantum solitons.Comment: 7 pages, 4 figure

The Search and Study of the Baryonic Resonances with the Strangeness S = +1 in the System of nK+ from the Reaction np -> npK+K- at the Momentum of Incident Neutrons Pn = (5.20+/-0.12)GeV/c

The production and properties of the resonances with the strangeness S = +1 in the system of nK+ were studied in the reaction np -> npK+K- at the momentum of incident neutrons Pn = (5.20+/-0.12)GeV/c. A number of peculiarities was found in the effective mass spectrum of the mentioned above system. All these resonances have a large statistical significance. Their widths are comparable with the mass resolution. The estimation of the spins of resonances was carried out and the rotational band connecting the resonances masses and their spins was constructed.Comment: 13 pages, 8 figures, 3 tables; These results were partially presented at the 32nd International Conference on High Energy Physics, Beijing, China, 16-22 August 200