共查询到20条相似文献,搜索用时 10 毫秒
1.
Lan Xu Ping-ke Zhang Gui-ping Wu 《International Journal of Theoretical Physics》2012,51(12):3815-3821
In this paper, we introduce the definition of a new kind of continuous-variable-type entangled coherent states, called double-mode excited entangled coherent states through acting creation operators on the double-mode entangled coherent states. We briefly present how to produce them from the two mode ECSs through an interaction between laser and atoms. We further focus on studying the fidelity of the states and discussing the influence of photon excitations on fidelity. 相似文献
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Heng-Mei Li Hong-Chun Yuan Zhi-Long Wan Zhen Wang 《International Journal of Theoretical Physics》2018,57(4):941-950
We theoretically introduce a kind of non-Gaussian entangled resources, i.e., coherent photon-added two-mode squeezed thermal states (CPA-TMSTS), by successively performing coherent photon addition operation to the two-mode squeezed thermal states. The normalization factor related to bivariate Hermite polynomials is obtained. Based upon it, the nonclassicality and decoherence process are analyzed by virtue of the Wigner function. It is shown that the coherent photon addition operation is an effective way in generating partial negative values of Wigner function, which clearly manifests the nonclassicality and non-Gaussianity of the target states. Additionally, the fidelity in teleporting coherent states using CPA-TMSTS as entangled resource is quantified both analytically and numerically. It is found that the CPA-TMSTS is an entangled resource of high-efficiency and high-fidelity in quantum teleportation. 相似文献
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Generation of Coherent Trimers from Bose-Condensed Atoms via a Generalized Stimulated Raman Adiabatic Passage 下载免费PDF全文
We propose to use a generalized technique of stimulated Raman adiabatic passage to create an atom-molecule dark state that permits the enhanced coherent creation of triatomic molecules in a repulsive atomic Bose-Einstein condensate. As an interesting comparison, the similar cases of creating heteronuclear (bosonic or fermionic) trimers are also briefly discussed. 相似文献
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G. StaszewskaL. Wolniewicz 《Journal of Molecular Spectroscopy》2002,212(2):208-212
Accurate Born-Oppenheimer potential energy curves and adiabatic corrections are computed for the six lowest 1Σu states of the hydrogen molecule. For the 41Σu-61Σu states adiabatic term values of the vibrational levels supported by the potentials and the corresponding rotational constants are given. For the outer potential well of the 61Σu state, Franck-Condon factors are listed for the possible transitions to the HH?1Σg state. 相似文献
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Daniel Rosenfeld Shimon L. Panfil Yuval Zur 《Journal of magnetic resonance (San Diego, Calif. : 1997)》1997,129(2):115-124
Adiabatic RF pulses play an important role in spin inversion due to their robust behavior in the presence of inhomogeneous RF fields. These pulses are characterized by the trajectory swept by the tip of theBeffvector and the rate of motion along it. In this paper, we describe a method by which optimized modulation functions can be constructed to render insensitivity toB1inhomogeneity over a predeterminedB1range and over a wide band of frequencies. This is accomplished by requiring that the optimized pulse fulfill the adiabatic condition over this range ofB1inhomogeneity and over the desired frequency band for the complete duration of the pulse. A trajectory similar to the well-known sech/tanh adiabatic pulse, i.e., a half-ellipse, is used. The optimization process improves the slice profile by optimizing the rate of motion along this trajectory. The optimized pulse can be tailored to the specific design requirements; in particular, the transition sharpness may be traded off against the inverted bandwidth. Two design examples, including experimental results, demonstrate the superiority of the optimized pulses over the conventional sech/tanh pulse: in the first example, a large frequency band is to be inverted using a weak RF amplitude in a short time. In the second example, a pulse with a very sharp transition is required. 相似文献
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We introduce a random perturbed version of the classical fidelity and we show that it converges with the same rate of decay
of correlations, but not uniformly in the noise. This makes the classical fidelity unstable in the zero-noise limit. 相似文献
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An analytical solution is given for amplitudes and phases of adiabatic decoupling sidebands as a function of spin inversion time tau. Since all the adiabatic decoupling phases theta(t, tau) refocus at two periods (2T) of the decoupling pulse, the sidebands are located at n/2T rather than at n/T as observed in other decoupling schemes. The real (R(n)(tau)) and imaginary (I(n)(tau)) amplitudes of the sidebands have symmetry R(n)(tau) = R(-n)(tau) and I(n)(tau) = -I(-n)(tau), forming a mirror image between the counterparts of the sidebands. When frequency sweep changes direction all I(n)(tau) are inverted while all R(n)(tau) remain unchanged, leading to pure absorption sidebands with two accumulations as demonstrated by Kupce and Freeman, and to an exchange of sidebands between counterparts. The sum of the real parts for sidebands n = 1 and 2 is almost a constant near on-resonance decoupling, and it increases substantially for large decoupling offsets. The phase defocusing can be minimized for all decoupling offsets by inserting an initial decoupling period with T(ini) = T/2, eliminating all sidebands located at n/2T (n = +/-1, +/-3, +/-5, ...). 相似文献
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Jarosław Piasecki 《Journal of statistical physics》2000,101(1-2):703-703
Non-equilibrium statistical mechanics is applied to the adiabatic piston problem. In one dimension the piston is modelled by a structureless particle possessing a single translationary degree of freedom. Its stochastic motion induced by collisions is shown to ensure the thermal energy flow between the separated volumes of the fluid. From the fundamental point of view, the piston with a finite mass is thus not adiabatic in the thermodynamic sense. However, physically relevant conclusions should take into account the time scales involed. 相似文献
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We discuss the logic implementation of quantum gates in the framework of the quantum adiabatic method, which uses the language of ground states, spectral gaps and Hamiltonians instead of the standard unitary transformation language. 相似文献
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Amararene A Gindre M Le Huerou J Urbach W Valdez D Waks M 《Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics》2000,61(1):682-689
The self-assembly of amphiphilic molecules into supramolecular aggregates involves a number of complex phenomena and forces. Recent developments of highly sensitive, densimetric and acoustic methods on small volume samples have provided novel sensitive probes to explore the physical properties of these complex fluids. We have investigated, by high precision densimetry and ultrasound velocimetry, reverse micelles of [sodium bis(2-ethylhexyl)sulfosuccinate] in oil (isooctane and decane), at increasing water concentration and at variable micellar volume fractions. The size of these spherical micelles has been determined by small angle x-ray scattering. Using these results, in the framework of the effective medium theory, we have developed a simple model of micellar compressibility, allowing the calculation of physical parameters (aggregation number, volume, and compressibility) of the surfactant monomolecular film as well as that of the micellar waters. In particular, we show that the central aqueous core designated as "free" water, located at a distance from the oil-water interacting interface, is twice as compressible as "bulk" water. One notable feature of this work is the influence of the nature of the oil on the above parameters. 相似文献
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《Physics letters. A》1997,235(2):164-168
We investigate the existence of adiabatic dust-acoustic solitons in a dusty plasma consisting of adiabatic dust particles along with Boltzmann distributed electrons and ions. It is shown that the presence of adiabatic dust particles decreases the magnitude of the soliton amplitude. 相似文献
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Gabrielse G Kolthammer WS McConnell R Richerme P Kalra R Novitski E Grzonka D Oelert W Sefzick T Zielinski M Fitzakerley D George MC Hessels EA Storry CH Weel M Müllers A Walz J;ATRAP Collaboration 《Physical review letters》2011,106(7):073002
Adiabatic cooling is shown to be a simple and effective method to cool many charged particles in a trap to very low temperatures. Up to 3×10(6) p are cooled to 3.5 K-10(3) times more cold p and a 3 times lower p temperature than previously reported. A second cooling method cools p plasmas via the synchrotron radiation of embedded e(-) (with many fewer e(-) than p in preparation for adiabatic cooling. No p are lost during either process-a significant advantage for rare particles. 相似文献
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Efimov Superchemistry: Quantum Dynamical Theory for Coherent Atom-Trimer Conversion in a Repulsive Atomic Bose-Einstein Condensate 下载免费PDF全文
We show that by making a generalized atom-molecule dark state, coherent creation of triatomic molecules can be enhanced in a repulsive atomic Bose-Einstein condensate. The dynamics of heteronuclear trimer creation is significantly different from the homonuclear case and further enhancement can be realized by controlling its chemical reaction channels. The possibility of manipulating atom-trimer conversion provides an appealing research area for current coherent matter-wave optics. 相似文献
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Unstructured Adiabatic Quantum Search 总被引:2,自引:0,他引:2
In the adiabatic quantum computation model, a computational procedure is described by the continuous time evolution of a time dependent Hamiltonian. We apply this method to the Grover's problem, i.e., searching a marked item in an unstructured database. Classically, the problem can be solved only in a running time of order O(N) (where N is the number of items in the database), whereas in the quantum model a speed up of order
has been obtained. We show that in the adiabatic quantum model, by a suitable choice of the time-dependent Hamiltonian, it is possible to do the calculation in constant time, independent of the the number of items in the database. However, in this case the initial time-complexity of
is replaced by the complexity of implementing the driving Hamiltonian. 相似文献
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Haxton WC 《Physical review letters》1986,57(10):1271-1274
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The problem of the self-trapping of the Frenkel exciton interacting with phonons is considered in the adiabatic approximation. The self-trapping is assumed to take place at a single site. The exciton scattering by phonons at this site and the nearest neighbouring sites is taken into account. Analytical expressions for the adiabatic surface of self-trapping excitons, in particular, for the barrier height separating almost free and self-trapped states, are found. The condition for the applicability of the model to the describing of the self-trapping barrier is determined. The adiabatic surface is shown to have several minima separated by a barrier, i.e. the coexistence of several types of self-trapped excitons is possible.Dedicated to Professor Miroslav Trlifaj on the occasion of his sixtieth birthday. 相似文献