电子自旋量子比特与机械谐振器的强磁耦合
Strong magnetic coupling between an electronic spin qubit and a mechanical resonator
摘要：
我们描述了一种技术，使一个强大的，相干耦合与金刚石中的氮空位杂质和磁化纳米机械谐振器尖端的量子化运动的单个电子自旋量子比特之间。这种耦合是通过精心准备修饰的自旋态来实现的，修饰的自旋态对共振器的运动高度敏感，但对来自核自旋浴的扰动不敏感。结合光学泵浦技术，自旋和运动激发之间的相干交换使得能够实现基态冷却和可控地产生共振器状态的任意量子叠加。光学自旋读出技术提供了一个通用的测量工具箱的谐振腔与量子有限的精度。
英文摘要：
We describe a technique that enables a strong, coherent coupling between a single electronic spin qubit associated with a nitrogen-vacancy impurity in diamond and the quantized motion of a magnetized nano-mechanical resonator tip. This coupling is achieved via careful preparation of dressed spin states which are highly sensitive to the motion of the resonator but insensitive to perturbations from the nuclear spin bath. In combination with optical pumping techniques, the coherent exchange between spin and motional excitations enables ground state cooling and the controlled generation of arbitrary quantum superpositions of resonator states. Optical spin readout techniques provide a general measurement toolbox for the resonator with quantum limited precision.
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