Hefei National Laboratory for Physics Sciences at Microscale, University of Science and Technology of China, China.
Phys Rev Lett. 2012 Aug 17;109(7):070502. doi: 10.1103/PhysRevLett.109.070502. Epub 2012 Aug 16.
In order to achieve reliable quantum-information processing results, we need to protect quantum gates along with the qubits from decoherence. Here we demonstrate experimentally on a nitrogen-vacancy system that by using a continuous-wave dynamical decoupling method, we might not only prolong the coherence time by about 20 times but also protect the quantum gates for the duration of the controlling time. This protocol shares the merits of retaining the superiority of prolonging the coherence time and at the same time easily combining with quantum logic tasks. This method can be useful in tasks where the duration of quantum controlling exceeds far beyond the dephasing time.
为了实现可靠的量子信息处理结果，我们需要保护量子门和量子比特免受退相干的影响。在这里，我们在氮空位系统上进行了实验演示，通过使用连续波动力学去耦方法，不仅可以将相干时间延长约 20 倍，而且可以在控制时间内保护量子门。该协议具有保留延长相干时间的优势，同时易于与量子逻辑任务相结合。这种方法在量子控制持续时间远远超过退相时间的任务中可能很有用。
