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In this paper, we propose a physical scheme to realize quantum SWAP gate by using a large-detuned single-mode cavity field and two identical Rydberg atoms. It is shown that the scheme can also be used to create multi-atom cluster state. During the interaction between atom and cavity, the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay. With the help of our scheme it is very simple to prepare the N-atom cluster state with perfect fidelity and probability. The practical feasibility of this method is also discussed. 相似文献
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本文对以蒸馏水为工质,流过内径和外径分别为168μm、406μm和399μm、798μm的电加热不锈钢管时的换热进行了实验研究。通过对微钢管直接通电进行加热,并采用红外成像仪及专用放大镜头的非接触式方法,获得了各种恒定加热功率及不同雷诺数下的微钢管壁面的温度场分布,进而得到较为精确的壁面平均温度。由此计算了在层流态下的换热系数Nu数。实验结果表明,在层流下,内径为168μm及399μm的微钢管内部的Nu数分别比经典的Hansen准则式所得到的Nu数高出很多。 相似文献
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Considering a two-level atom interacting with the competing two-mode field, this paper investigates the entanglement between the two-level atom and the two-mode field by using the quantum reduced entropy, and that between the two-mode field by using the quantum relative entropy of entanglement. It shows that the two kinds of entanglement are dependent on the relative coupling strength of atom-field and the atomic distribution, and exhibit the periodical evolution. The maximal atom-field entanglement state can be prepared via the appropriate selection of system parameters and interaction time. 相似文献
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We have investigated the evolution of the atomic quantum entropy and the entanglement of atom-photon in the system with competing k-photon and l-photon transitions by means of fully quantum theory, and examined the effects of competing photon numbers (k and l), the relative coupling strength between the atom and the two-mode field (A/g), and the initial photon number of the field on the atomic quantum entropy and the entanglement of atom-photon. The results show that the multiphoton competing transitions or the large relative coupling strength can lead to the strong entanglement between atoms and photons. The maximal atom-photon entanglement can be prepared via the appropriate selection of system parameters and interaction time. 相似文献
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The effect of anisotropy caused by a confining potential on the properties of fermionic cold atoms in a triangular optical lattice is systematically investigated by using the dynamical cluster approximation combined with the continuous time quantum Monte–Carlo algorithm.The quantum phase diagrams which reflect the temperature–interaction relation and the competition between the anisotropic parameter and the interaction are presented with full consideration of the anisotropy of the system.Our results show that the system undergoes a transition from Fermi liquid to Mott insulator when the repulsive interaction reaches a critical value.The Kondo effect also can be observed in this system and the pseudogap is suppressed at low temperatures due to the Kondo effect.A feasible experiment protocol to observe these phenomena in an anisotropic triangular optical lattice with cold atoms is proposed,in which the hopping terms are closely related to the lattice confining potential and the atomic interaction can be adjusted via the Feshbach resonance. 相似文献
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This paper investigates the quantum discord and entanglement of two atoms when they simultaneously interact with a single-mode
thermal field. The results show that, the two atoms which are initially in separate states can be entangled by a thermal field.
However, with increase of the mean photon number, the value of the entanglement decreases and disappears when the temperature
of the cavity is high enough (corresponding to the large value of the mean photon number). In stark contrast, the quantum
discord does not decrease, but gradually reaches stable value at high temperature. In addition, when the two atoms are initially
the Werner mixed state, we have found that, a large amount of quantum discord is exist even in the region where the entanglement
is zero, which is a strong signature for the presence of non classical correlations. These results indicate that, the quantum
discord is more resistant to the environment’s disturbance than the entanglement for higher temperatures. 相似文献
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