Zhao Yongfang

Interactions of MKrn+ (M = Cu, Ag, and Au; n = 1–3): Ab Initio Calculations

The equilibrium geometries, stabilities, and populations of the title species were investigated at the CCSD(T) level. The population analyses show covalent contribution occurs in the M–Kr bonding and the best theoretical estimate of the dissociation energies of the most stable AuKrn+ are 0.801, 1.743, and 2.193 eV. The electron correlation and relativistic effects on the interaction were investigated at the CCSD(T) level and both effects stabilize the title species.

Rapid estimation of the electron correlation energy for van der Waals complexes RgX (Rg = Kr, Xe, X = Br, I)

We present the rules of electron correlation energies for RgX (Rg = Kr, Xe, X = Br, I) van der Waals (vdW) complex systems at CCSD(T) theoretical level with SDB-cc-pVQZ basis set by the Gaussian 98 program. A new method to derive the dispersion coefficient C6 by fitting the intermonomer electron correlation energies to C6R−6 function is introduced. The present C6 values are compared with the corresponding theoretical ones.

Quantum Fluctuations of a Mesoscopic Capacitance Coupled Circuit with Power Source

Starting from classical equations of motion of the charges, we obtain the quantum fluctuations of the charges, and the currents of a mesoscopic capacitance coupled circuit with power source by using a canonical transformation and a unitary transformation. The uncertainty relations between charges and conjugate currents do not satisfy the minimum uncertainty relation, and is independent of the power source.

Theoretical Investigation on Structures and Stabilities of CuXenZ (n = 1–3, Z = –1, 0, +1) Clusters

The structures and stabilities of CuXe n Z (n = 1–3, Z = –1, 0, +1) cluster series at the CCSD(T) theoretical level have been investigated. Herein, it is shown that the cations are more stable and have more compact geometries than the anions and neutrals. The role of the interaction is explained using the natural bond orbital, population, and electron density analysis.

Influence of atomic motion on squeezing of double-mode field in interaction with a moving V-type three-level atom

The influence of atomic motion on squeezing of the double-mode field in the interaction with a moving V-type three level atom is investigated by means of the quantum theory and the method of numerical analysis. The results show, on the one hand, when the initial photon field is in non-correlative coherent state of double-mode, only the quadrature U1 is squeezed and the squeezed degree of U1 increases with the increasing of the parameter β which describes the atomic motion and structure of the field mode. On the other hand, when the initial field is in the vacuum squeezed state of double-mode, the quadrature U2 is squeezed principally and we can obtain a steady squeezed light by choosing an appropriate parameter β.

Double-wave description of mesoscopic resistance-inductance-capacitance coupled circuit with power source

Quantum fluctuations in the mesoscopic capacitance-inductance-resistance coupled circuit with a power source are investigated using canonical transformation and a double wavefunction. We confirm that the fluctuations are not influenced by the power source. As a new method, the double wavefunction describes a single system of the coupled circuit, whereas the single wavefunction describes a quantum ensemble.

One-step implementing three-qubit phase gate via manipulating rf SQUID qubits in the decoherence-free subspace with respect to cavity decay

We present a scheme for implementing a three-qubit phase gate via manipulating rf superconducting quantum interference device (SQUID) qubits in the decoherence-free subspace with respect to cavity decay. Through appropriate changes of the coupling constants between rf SQUIDs and cavity, the scheme can be realized only in one step. A high fidelity is obtained even in the presence of decoherence.

Ab initio study of ArnI− (n=1–6) clusters

The structures, stabilities and electron affinities (EAs) of ArnI− (n=1–6) clusters are investigated at the CCSD(T) theoretical level. In the global minimum energy structures, all the Ar atoms contact the central iodine anion directly. The electron correlation effects make the clusters more compact and stable. The calculated EAs are in agreement with the experimental results.

Quantum Fluctuation of Mesoscopic Capacitance Coupled Circuit in a Thermal Vacuum State

The quantum fluctuations of mesoscopic capacitance-coupled circuit in thermal vacuum state are investigated by using the theory of thermal field dynamics on the basis of quantization of the mesoscopic circuit. It is shown that under a definite temperature, the fluctuations of electric charges and currents change with temperature. The higher the temperature, the more quantum noise the coupled circuit exhibits.