Entanglement reciprocation between two charge qubits and two-cavity field

Li -, Chong, Gao Gao +1 more

Chen, Shengping, Song +5 more

Li Jun-Gang, Zou Jian, Cai Jin-Fang +1 more

Two charge qubits located inside a damped driven cavity is considered. The dynamical evolution of the entanglement between the two qubits is demonstrated analytically or numerically. It is found that with the cavity dissipation, the steady entanglement between the two qubits is sensitive to the initial state of the qubits, but independent of the cavity field's initial state. The two qubits initially in the separable and most mixed state can be more easily entangled. The external field can be used to enhance the steady entanglement between the two charge qubits.

Jie‐Qiao Liao, Le‐Man Kuang

We propose a scheme to generate entangled coherent states (ECSs) of two microwave cavity fields coupling to a SQUID-based Cooper pair box (CPB) charge qubit by extending the single-cavity model of coupling between a single microcavity and a CPB charge qubit proposed by Liu et al (2005 Phys. Rev. A 71 063820). We show that by measuring the states of the CPB charge qubit, ECSs of the two cavity fields can be generated with a controllable interaction between the cavities and the CPB charge qubit.

Fujun Zhang, Dongxin Wang, Kun Liu +1 more

Hünkar Kayhan

We study the dynamics of the entropy correlations and entanglement in a system of interaction of a superconducting charge qubit with a single-mode resonant cavity subject to noise considered as two-state random phase telegraph noise. We show that although the noise has an apparent suppressing effect on the evolution of the entropies of the qubit and the field and also on the entanglement in the system, the entropy exchange between the qubit and the field is independent of it during the time evolution of the system.