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951.
格子Boltzmann方法中的曲边界处理 总被引:4,自引:2,他引:2
研究了格子Boltzmann方法中实现曲边界条件的3种格式,对它们的精度和稳定性进行了分析和比较.通过二维Poiseuille流和等边三角域上空腔流的模拟,讨论了这3种格式的数值精度和稳定性. 相似文献
952.
Mouhammad El Hassan Laurent Keirsbulck Larbi Labraga 《Flow, Turbulence and Combustion》2009,82(3):359-374
The flow over a deep cavity at low subsonic velocity is considered in the present paper. The cavity length-to-depth aspect
ratio is L/H = 0.2. Single hot-wire measurements characterized the incident turbulent boundary layer and show the influence of the cavity
on the streamwise statistic components just downstream from the cavity. The streamwise mean and fluctuating velocity profiles
are affected by the cavity. PIV measurements reveal the presence for ejection-like events responsible of local perturbations
of the skewness and the flatness coefficients. Time-resolved PIV technic is also used to characterize phase properties of
shear layer oscillating cycle. It is shown that for deep cavity with first Rossiter mode, only one vortical structure is formed
at the cavity leading edge. Then, it grows while convecting downstream along the shear layer. A well-defined ejection process
begins after the vortex impact near the cavity downstream corner. A cylinder device placed spanwisely near the cavity leading
edge eliminates the resonance and highly modifies the behavior of the shear layer flow. In fact, the shear layer could be
divided into upper and lower parts with different structure aspects. 相似文献
953.
This paper proposes a scheme for generation of superpositions of
coherent states of the effective bosonic mode in a collection of
atoms. In the scheme an atomic sample interacts with a slightly
detuned cavity mode and a resonant strong classical field. Under
certain conditions the atomic system evolves from a coherent state
to a superposition of coherent states. 相似文献
954.
Recent years, several ways of implementing quantum games in different physical systems
have been presented. In this paper, we perform a theoretical analysis of an experimentally feasible
way to implement a two player
quantum game in cavity quantum electrodynamic(QED). In the scheme,
the atoms interact simultaneously with a highly detuned cavity mode
with the assistance of a classical field. So the scheme is
insensitive to the influence from the cavity decay and the thermal
field, and it does not require the cavity to remain in the vacuum
state throughout the procedure. 相似文献
955.
CHEN Ai-Xi HUANG Ke-Lin DENG Li 《理论物理通讯》2007,48(4):641-644
In this paper, a scheme is proposed for realization of two-qubit controlled-not gates and teleportation of an entangled state of atom-cavity. In this scheme, applying hyperfine levels of atom, we consider A-type three-level atom interacting resonantly or nonresonantly with cavity field that is prepared in σ- polarized. We consider the experimental feasibility of this scheme and compare our results with other schemes. 相似文献
956.
LIU Yu-Xiao WANG Yong-Qiang DUAN Yi-Shi 《理论物理通讯》2007,48(4):675-679
We study fermionic zero modes in the self-dual vortex background on an extra two-dimensional Riemann surface in (5+1) dimensions. Using the generalized Abelian-Higgs model, we obtain the inner topological structure of the self-dual vortex and establish the exact self-duality equation with topological term. Then we analyze the Dirac operator on an extra torus and the effective Lagrangian of four-dimensional fermions with the self-dual vortex background. Solving the Dirac equation, the fermionic zero modes on a torus with the self-dual vortex background in two simple cases are obtained. 相似文献
957.
This paper proposes a scheme for teleporting a two-atom entangled
state using leaky cavities. It uses resonant atom--cavity interaction
to map the atomic state onto the cavity field. Then it utilizes the
interference of polarized photons to establish the correlation
between the distant sender and receiver. The advantage of the scheme
is that the fidelity is independent of the cavity decay rate, atomic
decay and detection efficiency. 相似文献
958.
Density cavities generated by plasma--field interactions in the far wake region of a space vehicle
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Under the consideration of non-steady case, a set of equations is
derived, which describes the non-steady nonlinear interactions
between plasma and field in the far wake region of a space vehicle.
Numerical calculations are also made and the numerical results show
that density cavities and electromagnetic solitary waves are
generated due to the modulation instability, if the envelope of high
frequency modulation field is strong enough. This is
of great significance to the detection of disguised space vehicles. 相似文献
959.
We propose a scheme for preparing four-particle
Greenberger--Horne--Zeilinger states using two identical bimodal
cavities, each supports two modes with different frequencies. This
scheme is an alternative to another published work [Christopher C
Gerry 1996 {\it Phys. Rev.} A {\bf 53} 4591]. Comparisons between
them are discussed. The fidelity and the probability of success
influenced by cavity decay for the generated states are also
considered. 相似文献
960.
Multipartite entanglement in the interaction system between a single-mode microwave cavity field and superconducting charge qubits
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This paper proposes a method of generating multipartite entanglement through using
d.c. superconducting quantum interference devices (SQUID) inside a standing
wave cavity. In this scheme, the d.c. SQUID works in the charge region. It
is shown that, a large number of important multipartite entangled states can
be generated by a controllable interaction between a cavity field and
qubits. It is even possible to produce entangled states involving different
cavity modes based on the measurement of charge qubits states. After such
superpositions states are created, the interaction can be switched off by
the classical magnetic field through the SQUID, and there is no information
transfer between the cavity field and the charge qubits. 相似文献