Room-Temperature entangled quantum processor on integrated semiconductor photonics platform

TL;DR

This paper demonstrates the first room-temperature entangled quantum processor on an integrated silicon-carbide platform, achieving high-fidelity entanglement and single-spin control, paving the way for scalable quantum photonic networks.

Contribution

It introduces a monolithic quantum photonic processor on SiCOI, enabling room-temperature entanglement and spin manipulation on a CMOS-compatible platform.

Findings

Achieved deterministic single divacancy spin generation at room temperature.

Prepared a maximally entangled state with fidelity 0.89.

Demonstrated coherent control of nuclear spins on SiCOI.

Abstract

The rise of the 4H-silicon-carbide-on-insulator (SiCOI) platform marks a promising pathway towards the realization of monolithic quantum photonic networks. However, the challenge of establishing room-temperature entangled registers on these integrated photonics platforms remains unresolved. Herein, we demonstrate the first entangled processor on the SiCOI platform. We show that both deterministic generation of single divacancy electron spins and near-unity spin initialization of a single $^{13}$C nuclear spin can be achieved on SiCOI at room temperature. Besides coherently manipulating the single nuclear spin, a maximally entangled state with a fidelity of 0.89 has been prepared on this CMOS-compatible semiconductor-integrated photonics system. This work establishes the foundation for compact and on-chip solutions within existing defect-based computing and sensing protocols, positioning the SiCOI platform as the most promising candidate for integrated monolithic quantum photonic networks.