以磁场为控制场的量子比特系统量子态的最优制备

针对以磁场为控制场的电子自旋量子比特系统,结合量子门实现量子态幺正演化的量子态调控机制,提出了一种量子比特系统任意量子态的最优制备策略。建立了该量子比特系统及其控制场的模型,借助李群李代数,由经典最优控制的思想来获得最优控制,从而实现了电子自旋量子系统任意量子态的最优制备。理论分析与仿真实验显示了该策略的优越性。

Optimal preparation of quantum state of quantum-bit system taking magnetic field as controlling field

Based on a magnetic field controlled electron spin quantum system,utilizing the mechanism of realizing the unitary evolution of the quantum state through the quantum gate,an optimal control strategy to prepare an arbitrary quantum state is proposed.The procedure is as follows: after the modeling of the electron quantum bit system and the control field,applying the Lie-algebra,the control output is calculated by analogy with the classical optimal control method to achieve the target.The theoretical analysis and the simulation results showed the superiority of the proposed strategy.