132 research outputs found
Synchronization and bistability of qubit coupled to a driven dissipative oscillator
We study numerically the behavior of qubit coupled to a quantum dissipative
driven oscillator (resonator). Above a critical coupling strength the qubit
rotations become synchronized with the oscillator phase. In the synchronized
regime, at certain parameters, the qubit exhibits tunneling between two
orientations with a macroscopic change of number of photons in the resonator.
The life times in these metastable states can be enormously large. The
synchronization leads to a drastic change of qubit radiation spectrum with
appearance of narrow lines corresponding to recently observed single
artificial-atom lasing [O. Astafiev {\it et al.} Nature {\bf 449}, 588 (2007)].Comment: revtex 4 pages, 6 figs, research at http://www.quantware.ups-tlse.fr
Ossetian-Ingush Mixed Jury Trial: Institutionalization of Peopleâs Justice in Political and Legal Space of the Russian Empire
The article analyzes the features of the institutionalization of the national justice of Ossetians and Ingush in the conditions of their incorporation into the political and legal space of the Russian Empire on the example of a mixed jury, which existed in 1908-1910. The place of a mixed jury trial in the judicial system of the Terek region in the early 20th century, in which both formal (state) and informal (peopleâs) institutions functioned, is considered. Such traditional institutions of socio-normative culture of the Ossetians and the Ingush applied in judicial practice, as compensation for the murder (âpayment for bloodâ), infliction of wounds and injuries, theft, are described. Mutual responsibility as the main measure of responsibility for violation of the principles of social justice, as well as the oath and testimony of witnesses as a form of proof of guilt / innocence of the defendant are analysed in details. The principles of formation and replenishment of peopleâs cash registers, from which material compensation was paid to the injured party by the decision of the mixed court, were studied. It is concluded that the reception of the customs and traditions of Ossetians and Ingush by consolidating their peopleâs will in the Russian legal acts regulating the activities of the mixed court, retained the functional importance of national justice and laid the foundation for the formation of the subsequent Russian civil consciousness
Quantum synchronization and entanglement of two qubits coupled to a driven dissipative resonator
Using method of quantum trajectories we study the behavior of two identical
or different superconducting qubits coupled to a quantum dissipative driven
resonator. Above a critical coupling strength the qubit rotations become
synchronized with the driving field phase and their evolution becomes entangled
even if two qubits may significantly differ from one another. Such entangled
qubits can radiate entangled photons that opens new opportunities for entangled
wireless communication in a microwave range.Comment: 4 pages, 4 figs, research at http://www.quantware.ups-tlse.fr
Quantum correlations and synchronization measures
The phenomenon of spontaneous synchronization is universal and only recently
advances have been made in the quantum domain. Being synchronization a kind of
temporal correlation among systems, it is interesting to understand its
connection with other measures of quantum correlations. We review here what is
known in the field, putting emphasis on measures and indicators of
synchronization which have been proposed in the literature, and comparing their
validity for different dynamical systems, highlighting when they give similar
insights and when they seem to fail.Comment: book chapter, 18 pages, 7 figures, Fanchini F., Soares Pinto D.,
Adesso G. (eds) Lectures on General Quantum Correlations and their
Applications. Quantum Science and Technology. Springer (2017
Quantum Resonances of Kicked Rotor and SU(q) group
The quantum kicked rotor (QKR) map is embedded into a continuous unitary
transformation generated by a time-independent quasi-Hamiltonian. In some
vicinity of a quantum resonance of order , we relate the problem to the {\it
regular} motion along a circle in a -component inhomogeneous
"magnetic" field of a quantum particle with intrinsic degrees of freedom
described by the group. This motion is in parallel with the classical
phase oscillations near a non-linear resonance.Comment: RevTeX, 4 pages, 3 figure
Big Entropy Fluctuations in Statistical Equilibrium: The Macroscopic Kinetics
Large entropy fluctuations in an equilibrium steady state of classical
mechanics were studied in extensive numerical experiments on a simple
2--freedom strongly chaotic Hamiltonian model described by the modified Arnold
cat map. The rise and fall of a large separated fluctuation was shown to be
described by the (regular and stable) "macroscopic" kinetics both fast
(ballistic) and slow (diffusive). We abandoned a vague problem of "appropriate"
initial conditions by observing (in a long run)spontaneous birth and death of
arbitrarily big fluctuations for any initial state of our dynamical model.
Statistics of the infinite chain of fluctuations, reminiscent to the Poincar\'e
recurrences, was shown to be Poissonian. A simple empirical relation for the
mean period between the fluctuations (Poincar\'e "cycle") has been found and
confirmed in numerical experiments. A new representation of the entropy via the
variance of only a few trajectories ("particles") is proposed which greatly
facilitates the computation, being at the same time fairly accurate for big
fluctuations. The relation of our results to a long standing debates over
statistical "irreversibility" and the "time arrow" is briefly discussed too.Comment: Latex 2.09, 26 pages, 6 figure
Quantum phase transition in the Frenkel-Kontorova chain: from pinned instanton glass to sliding phonon gas
We study analytically and numerically the one-dimensional quantum
Frenkel-Kontorova chain in the regime when the classical model is located in
the pinned phase characterized by the gaped phonon excitations and devil's
staircase. By extensive quantum Monte Carlo simulations we show that for the
effective Planck constant smaller than the critical value the
quantum chain is in the pinned instanton glass phase. In this phase the
elementary excitations have two branches: phonons, separated from zero energy
by a finite gap, and instantons which have an exponentially small excitation
energy. At the quantum phase transition takes place and for
the pinned instanton glass is transformed into the sliding
phonon gas with gapless phonon excitations. This transition is accompanied by
the divergence of the spatial correlation length and appearence of sliding
modes at .Comment: revtex 16 pages, 18 figure
Life trajectories of parents whoâs parental rights were terminated: the sociological research
Life trajectories of parents whoâs parental rights were terminated: the sociological research / O. A. Volkova [et al.] // Indo American journal of pharmaceutical sciences. - 2017. - N04(09).-P. 3128-3133. - Refer.: p. 3132-3133.The article presents the results of a sociological research conducted in 2016 in the Belgorod, Saratov regions and the Trans-Baikal Territory and includes two stages. On the first stage there was the expert survey (n=25), where the informants were employees of the guardianship authorities; social services; education, health care and law institution
Fractal Spin Glass Properties of Low Energy Configurations in the Frenkel-Kontorova chain
We study numerically and analytically the classical one-dimensional
Frenkel-Kontorova chain in the regime of pinned phase characterized by phonon
gap. Our results show the existence of exponentially many static equilibrium
configurations which are exponentially close to the energy of the ground state.
The energies of these configurations form a fractal quasi-degenerate band
structure which is described on the basis of elementary excitations. Contrary
to the ground state, the configurations inside these bands are disordered.Comment: revtex, 9 pages, 9 figure
Gell-Mann--Okubo Mass Formula for an SU(4) Meson Hexadecuplet
Using a linear mass spectrum of an meson hexadecuplet, we derive the
Gell-Mann--Okubo mass formula for the charmed mesons, in good agreement with
experiment. Possible generalization of this method to a higher symmetry group
is briefly discussed.Comment: 11 pages, LaTe
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