Field programmable spin arrays for scalable quantum repeaters

Applications of solid-state qubits in large-scale quantum networks are limited by power and density constraints associated with microwave driving. Here the authors propose a programmable architecture based on diamond color centers driven by electric or strain fields for reduced cross-talk and power consumption. The large scale control over thousands of quantum emitters desired by quantum network technology is limited by the power consumption and cross-talk inherent in current microwave techniques. Here we propose a quantum repeater architecture based on densely-packed diamond color centers (CCs) in a programmable electrode array, with quantum gates driven by electric or strain fields. This 'field programmable spin array' (FPSA) enables high-speed spin control of individual CCs with low cross-talk and power dissipation. Integrated in a slow-light waveguide for efficient optical coupling, the FPSA serves as a quantum interface for optically-mediated entanglement. We evaluate the performance of the FPSA architecture in comparison to a routing-tree design and show an increased entanglement generation rate scaling into the thousand-qubit regime. Our results enable high fidelity control of dense quantum emitter arrays for scalable networking.

Automated summary

This study proposes a programmable architecture based on diamond color centers driven by electric or strain fields, aiming to reduce power consumption and cross-talk constraints in large-scale quantum networks. By densely packing diamond color centers in a programmable electrode array and driving quantum gates with electric or strain fields, this 'field programmable spin array’ (FPSA) enables high-speed control of individual color centers with low cross-talk and power dissipation. Integrated with a slow-light waveguide for efficient optical coupling, the FPSA serves as a quantum interface for optically-mediated entanglement, showing increased entanglement generation rate scaling into the thousand-qubit regime.