Tools from Quantum System and Control Theory

为了充分利用钻石NV中心作为量子寄存器或量子处理器的优势特性，必须最大限度地提高存储器的耐用性和读/写过程的精度。在量子处理器中，对计算门也有类似的要求。与此同时，应保护金融体系不受放松损失的影响。此外，尽管有最先进的材料工程，相邻量子比特之间的耦合结构必然会有微小但不可避免的(偶极)远程耦合相互作用。因此，现实的架构(硬件)通常是不理想的，必须由转向控制(软件)来补偿。-为了迎接所有这些挑战的结合，最优控制的数值方法就等同于。因此，这个子项目的范围是提供在给定的非理想和实验限制下设计最优控制的方法和算法。它们还可能包括将系统动力学保持在某些受消相干保护的子空间中的约束，或者相当于妥协的外部控制。在进一步的精化过程中，我们必须处理一个主方程参数部分未知的系统。

In order to fully exploit the advantageous properties of diamond NV centers as quantum registers or as quantum processors, the endurance of the memory and the precision of its read/write processes has to be taken to the limit. In quantum processors, analogous requirements hold for the computational gates. At the same time the system should be protected against relaxative losses. Moreover, in spite of state-of-the-art material engineering, the coupling architecture among the neighboring qubits is bound to have minor yet inevitable (dipolar) long-range coupling interactions. Thus a realistic architecture (hardware) is usually non-ideal and has to be compensated for by the steering controls (software). — In order to meet the combination of all these challenges, numerical methods of optimal control are tantamount. Therefore, it is the scope of this subproject to provide methods and algorithms for designing optimal controls under given non-idealty and experimental limitations. They may also comprise constraints as keeping the system dynamics In some decoherence-protected subspace or amount to compromised external controls. Upon further refinement, one has to address a system with partially unknown parameters of the master equation.