Repetitive Readout of a Single Electronic Spin via Quantum Logic with Nuclear Spin Ancillae
Repetitive Readout of a Single Electronic Spin via Quantum Logic with Nuclear Spin Ancillae
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DOI：
10.1126/science.1176496
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发表时间：
2009-10-09
期刊：
影响因子：
56.9
通讯作者：
Lukin, M. D.
中科院分区：
文献类型：
--
作者：
Jiang, L.;Hodges, J. S.;Lukin, M. D.
单量子比特的鲁棒测量在量子计算、量子通信、量子计量和传感等领域中起着关键作用。我们已经实现了一种方法，用于改进固态系统中单个电子自旋量子比特的读出。该方法利用量子逻辑操作的系统，包括一个单一的电子自旋和几个近端核自旋的附属，以重复读出的电子自旋的状态。利用室温金刚石中单个氮空位中心的相干操纵，实现了对由多达三个自旋组成的电子-核系统的全量子控制。我们利用了一个单一的核自旋存储器，以获得10倍的电子自旋读出的信号幅度增强。我们还提出了一个两级的，级联的程序，以提高读出使用一对核自旋的附属，实现强大的量子信息处理器，使用电子和核自旋量子比特的重要一步。我们的技术可用于提高基于自旋的纳米金刚石磁强计的灵敏度和速度。
Robust measurement of single quantum bits plays a key role in the realization of quantum computation and communication as well as in quantum metrology and sensing. We have implemented a method for the improved readout of single electronic spin qubits in solid-state systems. The method makes use of quantum logic operations on a system consisting of a single electronic spin and several proximal nuclear spin ancillae in order to repetitively readout the state of the electronic spin. Using coherent manipulation of a single nitrogen vacancy center in room-temperature diamond, full quantum control of an electronic-nuclear system consisting of up to three spins was achieved. We took advantage of a single nuclear-spin memory in order to obtain a 10-fold enhancement in the signal amplitude of the electronic spin readout. We also present a two-level, concatenated procedure to improve the readout by use of a pair of nuclear spin ancillae, an important step toward the realization of robust quantum information processors using electronic-and nuclear-spin qubits. Our technique can be used to improve the sensitivity and speed of spin-based nanoscale diamond magnetometers.