Eur. Phys. J. D 59, 479-485 (2010)
https://doi.org/10.1140/epjd/e2010-00175-7

Non-Markovian entanglement dynamics in coupled superconducting qubit systems

¹ Key Laboratory of Systems and Control, Institute of Systems Science, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, 100190, Beijing, P.R. China
² Graduate University of Chinese Academy of Sciences, 100039, Beijing, P.R. China

Corresponding author: ^a zrxi@iss.ac.cn

Received: 12 November 2009
Revised: 8 March 2010
Published online: 2 July 2010

Abstract

We theoretically analyze the entanglement generation and dynamics by coupled Josephson junction qubits. Considering a current-biased Josephson junction (CBJJ), we generate maximally entangled states. In particular, the entanglement dynamics is considered as a function of the decoherence parameters, such as the temperature, the ratio r ≡ / between the reservoir cutoff frequency and the system oscillator frequency ,
and the energy levels split of the superconducting circuits in the non-Markovian master equation. We analyzed the entanglement sudden death (ESD) and entanglement sudden birth (ESB) by the non-Markovian master equation. Furthermore, we find that the larger the ratio r and the thermal energy k_BT, the shorter the decoherence. In this superconducting qubit system we find that the entanglement can be controlled and the ESD time can be prolonged by adjusting the temperature and the superconducting phases which split the energy levels.