Abstract
We study the parametric interaction between a single nitrogen-vacancy electronic spin and a diamond mechanical resonator in which the spin is embedded. Coupling between spin and oscillator is achieved by crystal strain, which is generated upon actuation of the oscillator and which parametrically modulates the spins’ energy splitting. Under coherent microwave driving of the spin, this parametric drive leads to a locking of the spin Rabi frequency to the oscillator mode in the megahertz range. Both the Rabi oscillation decay time and the inhomogeneous spin dephasing time increase by two orders of magnitude under this spin-locking condition. We present routes to prolong the dephasing times even further, potentially to the relaxation time limit. The remarkable coherence protection that our hybrid spin-oscillator system offers is reminiscent of recently proposed concatenated continuous dynamical decoupling schemes and results from our robust, drift-free strain-coupling mechanism and the narrow linewidth of the high-quality diamond mechanical oscillator employed. Our findings suggest feasible applications in quantum information processing and sensing.
Highlights
We study the parametric interaction between a single Nitrogen-Vacancy electronic spin and a diamond mechanical resonator in which the spin is embedded
New approaches to continuous dynamical decoupling are required to yield fully robust spin systems which are of practical use to quantum information processing and sensing
We experimentally demonstrate a novel and efficient approach to continuous dynamical decoupling, through the parametric interaction of a single electronic spin with a mechanical resonator
Summary
We study the parametric interaction between a single Nitrogen-Vacancy electronic spin and a diamond mechanical resonator in which the spin is embedded. A concatenation of only two driving fields thereby yields a coherence time nearly two orders of magnitude longer than that of an undriven spin, while maintaining a final dressed state splitting close to one MHz. By using mechanical oscillators with even higher quality-factors, our scheme should allow us to prolong coherence times even further and reach the limit imposed by energy relaxation.
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