Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy Center at Room Temperature.
Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy Center at Room Temperature.
复制标题
DOI：
10.1103/physrevlett.118.150504
复制
发表时间：
2016-12
影响因子：
8.6
通讯作者：
Gang-Qin Liu;Jian Xing;Wen-Long Ma;Ping Wang;Chang-Hao Li;H. Po;Yu-Ran Zhang;H. Fan;Renbao Liu;Xin-Yu Pan
中科院分区：
文献类型：
--
作者：
Gang-Qin Liu;Jian Xing;Wen-Long Ma;Ping Wang;Chang-Hao Li;H. Po;Yu-Ran Zhang;H. Fan;Renbao Liu;Xin-Yu Pan
可扩展的量子计算需要单次读出量子位。由于相干时间长，核自旋是极好的量子存储器，但由于与探针的相互作用较弱，很难一次性读出。在这里，我们演示了室温下弱耦合 ^{13}C 核自旋的单次读数，这在传统协议中是无法解析的。弱耦合核自旋的状态通过连续的弱测量被捕获并投影读出，这是通过动态去耦脉冲实现的。与氮空位 (NV) 中心耦合的核自旋强度为 330 kHz，可在 200 毫秒内读出，保真度为 95.5%。这项工作为室温下弱耦合量子位的单次读出提供了通用协议，因此大大扩展了可扩展量子计算的物理系统的范围。
Single-shot readout of qubits is required for scalable quantum computing. Nuclear spins are superb quantum memories due to their long coherence time, but are difficult to be read out in a single shot due to their weak interaction with probes. Here we demonstrate single-shot readout of a weakly coupled ^{13}C nuclear spin at room temperature, which is unresolvable in traditional protocols. States of the weakly coupled nuclear spin are trapped and read out projectively by sequential weak measurements, which are implemented by dynamical decoupling pulses. A nuclear spin coupled to the nitrogen-vacancy (NV) center with strength 330 kHz is read out in 200 ms with a fidelity of 95.5%. This work provides a general protocol for single-shot readout of weakly coupled qubits at room temperature and therefore largely extends the range of physical systems for scalable quantum computing.