Selective nuclear-spin interaction based on a dissipatively stabilized nitrogen-vacancy center

TL;DR

This paper introduces a method for high-fidelity, selective nuclear-spin quantum gates at room temperature using a dissipatively stabilized nitrogen-vacancy center with RF control, overcoming previous limitations in heteronuclear systems.

Contribution

It develops a scheme combining periodic NV spin resets and RF control to enable selective, high-fidelity quantum gates between heteronuclear nuclear spins at ambient conditions.

Findings

Achieved high-fidelity quantum gates between heteronuclear spins.

Demonstrated nuclear spin detection under ambient conditions.

Protected nuclear spins from NV spin decoherence using periodic resets.

Abstract

Current typical methods to realize nuclear-nuclear quantum gates require a sequence of electronnuclear quantum gates by using dynamical decoupling techniques, which are implemented at low temperature because of short decoherence and relaxation time of the NV spin at room temperature. This limitation could be overcome by using periodical resets of an NV spin as a mediator of interaction between two nuclear spins [Chen, Schwarz, and Plenio, 119, 010801 (2017)]. However, this method works under stringent coupling strengths condition, which makes it not applicable to heteronuclear quantum gate operations. Here we develop this scheme by using radio-frequency (RF) fields to control different nuclear spin species. Periodical resets of the NV center protect the nuclear spins from decoherence and relaxation of the NV spin. RF control provides probability to have highly selective and high fidelity quantum gates between heteronuclear spins as well as detecting nuclear spins by using a nuclear spin sensor under ambient conditions.