We investigate a scheme for an environment-induced geometric phase based on a multi-level artificial atom, initially prepared in a mixed state, that is sent through a superconducting cavity. It is shown that the environment provides a mechanism for the generation of a long-lived geometric phase. Owing to the effect of the decoherence, the solution of the master equation allows one ... إقراء المزيد

We propose a new formulation of quantum algorithm which allows to distribute amplitudes over two copies of small quantum subsystems. The new method gives a fixed number of copies and applied to the control of multi-qubit system. The analysis for the amount of error due to the distribution process has been presented for a system of 10 qubits with a ... إقراء المزيد

We analyze a crucial effect of the spin-path environment on a single and maximum entangled two-qubit systems. For a single qubit, we investigate the coherent loss by means of coherent-vectors' dynamics and the interacted qubits' fidelity. We used entanglement and population dynamics to investigate the coherent loss of the two-qubit system. We show and numerically verify that the effect of ... إقراء المزيد

We study the dynamical properties of a cavity field coupling to a Cooper pair box (CPB). We assumed that the CPB is prepared initially in a mixed state with a coherent state for the field. By solving the time-dependent equations using the evolution operator, it shows that mean numbers of Cooper pairs is affected by the detuning. The mean number ... إقراء المزيد

We investigate the dynamical behavior of a three-level moving atom interacting with a laser field. We show that the sensitivity of atomic dynamics can be considerably improved by exploiting the spatial dependence of moving atoms within the framework of the homotopy perturbation method. The dynamics of the system is analyzed as well as the effect of various parameters including detuning ... إقراء المزيد

We study the dynamics of quantum discord and entanglement of two entangled two-level atoms within two isolated and dissipative cavities in the weak- or strong-coupling regime. The quantum entanglement are measured by concurrence and relative entropy. The quantum discord of two atoms based on quantum mutual information and relative entropy are also calculated. In the weak-coupling regime, the sudden death ... إقراء المزيد

We investigate the dynamics of a tri-beam laser interacting with a closed three-level atomic system. The Bloch equations are obtained using Hesinberg’s equation of motion. The impact of the resulting parameters on the atomic occupation probabilities and information entropy is discussed. It is shown that the populations are affected by the detuning in different ways which are then compared in ... إقراء المزيد

The behavior of the atomic occupation probabilities of the upper and lower levels gained by a two-ion system interacting with a laser field is investigated. At a fixed time the immediate relations of the populations are examined against several physical parameters. It is observed that for some intermediate ranges of the detuning parameters and the coupling strength, the presence of ... إقراء المزيد

In this paper, we investigate the geometric phase of the field interacting with a moving four-level atom in the presence of Kerr medium. The results show that the atomic motion, the field-mode structure and Kerr medium play important roles in the evolution of the system dynamics. As illustration, we examine the behavior of the geometric phase and entanglement with experimentally ... إقراء المزيد

We study the time evolution of the total and Pancharatnam phase of four-level atoms in the presence of a one-dimensional photonic-band-gap material. We obtain analytical and numerical results under certain parametric conditions and analyze the effect of a Kerr-like medium and the detuning parameter on the dynamics of the Pancharatnam phase for the initial atomic position. We observe an interesting ... إقراء المزيد