Anisotropic electron-nuclear interactions in a rotating quantum spin bath

Wood, Alexander A.; Goldblatt, Russell M.; Anderson, Russell P.; Hollenberg, Lloyd C. L.; Scholten, Robert E.; Martin, Andy M.

doi:10.48550/arxiv.2105.07365

Cited by 1 publication

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References 48 publications

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“…Another intriguing possibility is employing other nuclear spin species, such as 13 C, which couple to each other via the dipolar interaction in natural abundance samples. An interesting interplay is then expected between NV-mediated nuclear hyperpolarization and spin diffusion [50,51] and rotational averaging of homonuclear couplings, since the experimental configuration in our work emulates that of NMR magicangle spinning [52,53].…”

Section: Discussionmentioning

confidence: 82%

Quantum control of nuclear spin qubits in a rapidly rotating diamond

Wood¹,

Goldblatt²,

Scholten³

et al. 2021

Preprint

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Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. When coupled to the spin of an optically-active electron, nuclear spins can be rapidly polarized, controlled and read via lasers and radiofrequency fields. Possessing coherence times of several milliseconds at room temperature, nuclear spins hosted by a nitrogen-vacancy center in diamond are thus intriguing systems to observe how classical physical rotation at quantum timescales affects a quantum system. Unlocking this potential is hampered by precise and inflexible constraints on magnetic field strength and alignment in order to optically induce nuclear polarization, which restricts the scope for further study and applications. In this work, we demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at 1 kHz, faster than the nuclear spin coherence time. Free from the need to maintain strict field alignment, we are able to measure and control nuclear spins in hitherto inaccessible regimes, such as in the presence of a large, time-varying magnetic field that makes an angle of more than 100 • to the nitrogen-lattice vacancy axis. The field induces spin mixing between the electron and nuclear states of the qubits, decoupling them from oscillating rf fields. We are able to demonstrate that coherent spin state control is possible at any point of the rotation, and even for up to six rotation periods. We combine continuous dynamical decoupling with quantum feedforward control to eliminate decoherence induced by imperfect mechanical rotation. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.

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