The field of solid-state quantum computation is expanding rapidly initiated by our original
charge qubit demonstrations. Various types of solid-state qubits are being studied, and their …

We study the effect of a phase shift on the amount of transferable two-spin entanglement in a
spin chain. We consider a ferromagnetic Heisenberg or XY spin chain, both numerically and …

In this paper, we investigate the dynamics of coded information in a single Cooper pair
interacting with a single Cavity mode. The effect of the relative ratio of Josephson junction …

We consider a model which consists of two coupled superconducting charge qubits by
sharing a large Josephson junction. The time evolution of entanglement between two …

In a recent paper Dajka et al (2007 J. Phys. A: Math. Theor. 40 F879) predicted that some
composite systems can be entangled forever even if coupled with a thermal bath. We …

We consider the possibility of generating macroscopic entangled states in capacitively
coupled phase qubits. First we discuss the operation of phase qubits and the …

Analytical description of the dynamics of a superconducting qubit interacting with a
resonator cavity coupled to its reservoir is presented. When the detuning between the …

Adopting the framework of two-coupled superconducting charges model, we derive a
general formula for the total correlation function between the two charge qubits initially …

We analyze a controllable generation of maximally entangled mixed states of a circuit
containing two-coupled superconducting charge qubits. Each qubit is based on a Cooper …

Dynamical properties of a resonator can be analyzed using the Rayleigh–Lorentz invariant
which is not an exact constant but varies more or less over time depending on variations of …