Gigahertz Dynamics of a Strongly Driven Single Quantum Spin
Gigahertz Dynamics of a Strongly Driven Single Quantum Spin
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DOI：
10.1126/science.1181193
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发表时间：
2009-12-11
期刊：
影响因子：
56.9
通讯作者：
Awschalom, D. D.
中科院分区：
文献类型：
--
作者：
Fuchs, G. D.;Dobrovitski, V. V.;Awschalom, D. D.
两级系统是许多现实世界技术的核心，如磁共振成像和原子钟。状态的相干控制是通过振荡场实现的，振荡场以其振幅决定的速率驱动动力学。随着磁场强度的增加，一种不同的状态出现，其中操纵率的线性缩放被打破，并且预计会出现复杂的动力学。通过用绝热通道校准自旋旋转，我们测量了金刚石中单个氮空位中心的室温“强驱动”动力学。通过一个绝热通道来校准自旋旋转，我们在亚纳秒的时间尺度上观察了动力学。与传统的想法相反，旋转波近似的这种分解为单个自旋的时间最优量子控制提供了机会。
Two-level systems are at the core of numerous real-world technologies such as magnetic resonance imaging and atomic clocks. Coherent control of the state is achieved with an oscillating field that drives dynamics at a rate determined by its amplitude. As the strength of the field is increased, a different regime emerges where linear scaling of the manipulation rate breaks down and complex dynamics are expected. By calibrating the spin rotation with an adiabatic passage, we have measured the room-temperature "strong-driving" dynamics of a single nitrogen vacancy center in diamond. With an adiabatic passage to calibrate the spin rotation, we observed dynamics on sub-nanosecond time scales. Contrary to conventional thinking, this breakdown of the rotating wave approximation provides opportunities for time-optimal quantum control of a single spin.