基于电路量子电动力学系统实现一维cluster态的制备

在电路量子电动力学系统中,本文提出利用磁通比特和LC电路间的耦合来制备多比特的一维cluster态的方案。方案中,LC电路作为中间转化器,通过选择恰当电磁场的参数和调节比特间的能级间隔,使磁通比特间发生纠缠从而制备出多比特的一维cluster态。在大失谐的条件下,磁通比特和量子数据总线间的相互作用可通过调节虚光子来转化。此外,该方案的合理性也已在实验上得到了证明。

Quantum Decoherence of Charge Qubit Coupled to Nonlinear Nanomechanical Resonator

When the nonlinearity of nanomechanical resonator is not negligible, the quantum decoherenee of charge qubit is studied analytically. Using nonlinear Jaynes-Cummings model, one explores the possibility of being quantum data bus for nonlinear nanomechanical resonator, the nonlinearity destroys the dynamical quantum information-storage and maintains the revival of quantum coherence of charge qubit. With the calculation of decoherence factor, we demon- strate the influence of the nonlinearity of nanomechanical resonator on engineered decoherence of charge qubit.