Tunable Gyromagnetic Augmentation of Nuclear Spins in Diamond

TL;DR

This paper demonstrates tunable enhancement of nuclear spin control in diamond using NV centers, enabling faster quantum operations on dark nuclear spins at room temperature.

Contribution

It introduces a method to augment and tune the gyromagnetic ratio of nuclear spins via hyperfine coupling, facilitating rapid quantum control.

Findings

Enhanced nuclear spin coupling via hyperfine interaction

Tunable control achieved by adjusting external magnetic field

Potential for fast, room-temperature quantum operations

Abstract

Nuclear spins in solids exhibit long coherence times due to the small nuclear gyromagnetic ratio. This weak environmental coupling comes at the expense of slow quantum gate operations, which should be as fast as possible for many applications in quantum information processing and sensing. In this work, we use nitrogen-vacancy (NV) centers in diamond to probe the nuclear spins within dark paramagnetic nitrogen defects (P1 centers) in the diamond lattice. The gyromagnetic ratio of the P1 nuclear spin is augmented by hyperfine coupling to the electron spin, resulting in greatly enhanced coupling to radiofrequency control fields. We then demonstrate that this effect can be tuned by variation of an external magnetic field. Our work identifies regimes in which we are able to implement fast quantum control of dark nuclear spins, and lays the foundations for further inquiry into rapid control of long-lived spin qubits at room temperature.