Nanoelectromechanical control of spin-photon interfaces in a hybrid quantum system on chip

TL;DR

This paper presents a hybrid quantum system-on-chip that integrates piezoelectric strain control of diamond-based spin qubits, enabling scalable, low-power, and individually addressable quantum photonic devices for advanced quantum communication and computing.

Contribution

It introduces a novel hybrid architecture achieving all key criteria for scalable quantum photonic systems, including low-power control and individual optical addressing.

Findings

Achieved over 20 GHz emitter transition tuning range.

Demonstrated acoustic manipulation of tin vacancy spins.

Estimated single-phonon coupling rates exceeding 1 kHz.

Abstract

Atom-like defects or color centers (CC's) in nanostructured diamond are a leading platform for optically linked quantum technologies, with recent advances including memory-enhanced quantum communication, multi-node quantum networks, and spin-mediated generation of photonic cluster states. Scaling to practically useful applications motivates architectures meeting the following criteria: C1 individual optical addressing of spin qubits; C2 frequency tuning of CC spin-dependent optical transitions; C3 coherent spin control in CC ground states; C4 active photon routing; C5 scalable manufacturability; and C6 low on-chip power dissipation for cryogenic operations. However, no architecture meeting C1-C6 has thus far been demonstrated. Here, we introduce a hybrid quantum system-on-chip (HQ-SoC) architecture that simultaneously achieves C1-C6. Key to this advance is the realization of piezoelectric strain control of diamond waveguide-coupled tin vacancy centers to meet C2 and C3, with ultra-low power dissipation necessary for C6. The DC response of our device allows emitter transition tuning by over 20 GHz, while the large frequency range (exceeding 2 GHz) enables low-power AC control. We show acoustic manipulation of integrated tin vacancy spins and estimate single-phonon coupling rates over 1 kHz in the resolved sideband regime. Combined with high-speed optical routing with negligible static hold power, this HQ-SoC platform opens the path to scalable single-qubit control with optically mediated entangling gates.