Realizable spin models and entanglement dynamics in superconducting flux qubit systems
Qian‐Qian Shi, Sam Young Cho, Bo Li, Mun Dae Kim · Physical Review B · 2008
Realizable spin models are investigated in a superconducting flux qubit system. By adjusting system parameters, it is shown that various artificial spin systems can be realized such as the quantum Ising model and the class of $XXZ$ spin model in the same flux qubit system. The entanglement dynamics of the realizable systems, especially for the two-qubit system, is discussed by means of their concurrence and fidelity. It is found that an unentangled input state can evolve to be a maximally entangled output state periodically due to the exchange interactions induced by two-qubit flipping tunneling processes.