Doctoral Thesis: Heterogeneous integration of spin-photon interfaces with a scalable CMOS platform 

By: Linsen Li

Thesis Supervisor: Dirk Englund

Details

• Date: Tuesday, April 30
• Time: 11:00 am - 12:30 pm
• Category: Thesis Defense
• Location: Grier Room A (34-401A)

Additional Location Details:

Abstract:
Color centers in diamond have emerged as a leading solid-state platform for advancing quantum technologies, satisfying the DiVincenzo criteria and recently achieving quantum advantage in secret key distribution. Blueprint studies indicate that general-purpose quantum computing using local quantum communication networks will require millions of physical qubits to encode thousands of logical qubits, presenting an open scalability challenge. Here we introduce a modular ”Quantum System-on-Chip” (QSoC) architecture that integrates thousands of individually addressable tin-vacancy spin qubits in two-dimensional arrays of ”quantum microchiplets” (QMCs) into an application-specific integrated circuit (ASIC) designed for cryogenic control. We demonstrate crucial fabrication steps and architectural subcomponents, including QSoC transfer via a ‘lock-and-release’ method for large-scale heterogeneous integration; high-throughput spin-qubit calibration and spectral tuning; and efficient spin-state preparation and measurement. This QSoC architecture supports full connectivity for quantum memory arrays by spectral tuning across spin-photon frequency channels. Design studies building on these measurements indicate further scaling potential via increased qubit density, larger QSoC active regions, and optical networking across QSoC modules.