In the framework of the extended relativistic mean-field theory with hyperons, the properties of neutron star matter have been investigated. It is found that at a density of four to five times that of nuclear matter s...In the framework of the extended relativistic mean-field theory with hyperons, the properties of neutron star matter have been investigated. It is found that at a density of four to five times that of nuclear matter saturation density po, a neutron star will become a hyperon star. This transition is strongly influenced by the coupling constants of hyperons to mesons and a different parameter set. For a given parameter set, a minimum transition baryon density exists when the hyperon coupling ratios satisfy xHσ=xHω=xHρ=0.65 or xHσ=xHω=0.62,xHρ=0.7.展开更多
Entangling multiple qubits is one of the central tasks of quantum information processing.We propose an approach to entangle a number of cold ions(individually trapped in a string of microtraps)by a moved cavity.The ca...Entangling multiple qubits is one of the central tasks of quantum information processing.We propose an approach to entangle a number of cold ions(individually trapped in a string of microtraps)by a moved cavity.The cavity is pushed to include the ions one by one with a uniform velocity and thus the information stored in former ions could be transferred to the latter ones by such a moving cavity bus.Since the positions of the trapped ions are precisely located,the strengths and durations of the ion-cavity interactions can be exactly controlled.As a consequence,by properly setting the relevant parameters,typical multi-ion entangled states,e.g.,W state for 10 ions,could be deterministically generated.The feasibility of the proposal is also discussed.展开更多
Persistent circulating currents in a mesoscopic open ring with side-branch structures are derived by transfer matrix method in the framework of quantum waveguide theory on networks.The behavior of transmission probabi...Persistent circulating currents in a mesoscopic open ring with side-branch structures are derived by transfer matrix method in the framework of quantum waveguide theory on networks.The behavior of transmission probability may show the Fano resonance in the presence of geometric scattering of side-branch structures.It is shown that persistent circulating currents in the main loop with equal length of both arms in the absence of magnetic Aux occur near the Fermi wave vectors where the Fano resonance appears.The numerical results show that a larger persistent current is associated with a stronger Fano resonance.The persistent circulating currents can be controlled by the Aux of side-branch structure.展开更多
基金Supported by the Major State Basic Research Development Program under Grant No.G2000077407the National Natural Science Foundation of China under Grant Nos.10025522,19847002,19935030 and 10047001.
文摘In the framework of the extended relativistic mean-field theory with hyperons, the properties of neutron star matter have been investigated. It is found that at a density of four to five times that of nuclear matter saturation density po, a neutron star will become a hyperon star. This transition is strongly influenced by the coupling constants of hyperons to mesons and a different parameter set. For a given parameter set, a minimum transition baryon density exists when the hyperon coupling ratios satisfy xHσ=xHω=xHρ=0.65 or xHσ=xHω=0.62,xHρ=0.7.
基金by the National Natural Science Foundation of China under Grant Nos 10874142 and 90921010the National Basic Research Program of China under Grant No 2010CB923104.
文摘Entangling multiple qubits is one of the central tasks of quantum information processing.We propose an approach to entangle a number of cold ions(individually trapped in a string of microtraps)by a moved cavity.The cavity is pushed to include the ions one by one with a uniform velocity and thus the information stored in former ions could be transferred to the latter ones by such a moving cavity bus.Since the positions of the trapped ions are precisely located,the strengths and durations of the ion-cavity interactions can be exactly controlled.As a consequence,by properly setting the relevant parameters,typical multi-ion entangled states,e.g.,W state for 10 ions,could be deterministically generated.The feasibility of the proposal is also discussed.
基金Supported in part by the National Natural Science Foundation of China under Grant No.19475017the Doctoral Education Fund of the State Education Commission of China under Grant No.9373010.
文摘Persistent circulating currents in a mesoscopic open ring with side-branch structures are derived by transfer matrix method in the framework of quantum waveguide theory on networks.The behavior of transmission probability may show the Fano resonance in the presence of geometric scattering of side-branch structures.It is shown that persistent circulating currents in the main loop with equal length of both arms in the absence of magnetic Aux occur near the Fermi wave vectors where the Fano resonance appears.The numerical results show that a larger persistent current is associated with a stronger Fano resonance.The persistent circulating currents can be controlled by the Aux of side-branch structure.
