Heterogeneous integration of spin-photon interfaces with a CMOS platform

Area of Science:

• Quantum Information Science
• Solid-State Quantum Technologies
• Nanoscale Engineering

Background:

• Diamond color centers, like tin-vacancy (SnV) qubits, are promising for quantum technologies, meeting DiVincenzo criteria.
• Scalability challenges exist for quantum computing, requiring millions of qubits for robust logical operations.
• Current architectures face limitations in integrating and controlling large numbers of qubits efficiently.

Purpose of the Study:

• To introduce a modular quantum system-on-chip (QSoC) architecture for scalable quantum computing.
• To demonstrate the feasibility of integrating thousands of individually addressable SnV spin qubits.
• To address the challenge of large-scale heterogeneous integration and control of quantum devices.

Main Methods:

• Development of a QSoC architecture integrating SnV spin qubits in 2D arrays on an application-specific integrated circuit.
• Utilizing a 'lock-and-release' method for heterogeneous integration of quantum microchiplets.
• Implementing high-throughput spin qubit calibration, spectral tuning, and efficient spin state preparation/measurement.

Main Results:

• Demonstration of crucial fabrication steps and architectural subcomponents for the QSoC.
• Successful integration of thousands of individually addressable SnV spin qubits.
• QSoC architecture enables full connectivity for quantum memory arrays via spectral tuning across spin-photon channels.

Conclusions:

• The QSoC architecture provides a scalable platform for quantum computing and communication networks.
• The demonstrated methods pave the way for manufacturing large-scale quantum systems.
• Further scaling is achievable through increased qubit density, larger QSoC regions, and optical networking.