Coupling a single spin to high-frequency motion
arxiv(2024)
摘要
Coupling a single spin to high-frequency mechanical motion is a fundamental
bottleneck of applications such as quantum sensing, intermediate and
long-distance spin-spin coupling, and classical and quantum information
processing. Previous experiments have only shown single spin coupling to
low-frequency mechanical resonators, such as diamond cantilevers.
High-frequency mechanical resonators, having the ability to access the quantum
regime, open a range of possibilities when coupled to single spins, including
readout and storage of quantum states. Here we report the first experimental
demonstration of spin-mechanical coupling to a high-frequency resonator. We
achieve this all-electrically on a fully suspended carbon nanotube device. A
new mechanism gives rise to this coupling, which stems from spin-orbit
coupling, and it is not mediated by strain. We observe both resonant and
off-resonant coupling as a shift and broadening of the electric dipole spin
resonance (EDSR), respectively. We develop a complete theoretical model taking
into account the tensor form of the coupling and non-linearity in the motion.
Our results propel spin-mechanical platforms to an uncharted regime. The
interaction we reveal provides the full toolbox for promising applications
ranging from the demonstration of macroscopic superpositions, to the operation
of fully quantum engines, to quantum simulators.
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