Towards scalable quantum technologies: monolithically integrated electronic-photonic quantum light sources
Embargo Date
2026-09-11
OA Version
Citation
Abstract
Quantum technologies are at the forefront of scientific advancements, with the potential to profoundly alter our lives. These quantum applications depend on a consistent, large-scale supply of qubits to realize their potential and achieve quantum advantage. The development of practical quantum technologies is currently hindered by the absence of a scalable quantum platform. Integrated silicon photonics, realized within state-of-the-art CMOS foundries, emerges as a promising solution to this challenge, enabling a scalable quantum source of light via the monolithic integration of thousands of photonic components alongside complex control electronics.
In this dissertation I introduce a scalable implementation of the electronic-photonic quantum source of light on chip. This system can be used as a fundamental block in more complex systems used to realize quantum computing, communication, or sensing. The physical realization of our quantum light source on chip is derived strictly from the first principles, while accounting for the imperfections associated with the manufacturing variability observed in CMOS foundries. By designing all critical elements of our system to offer active control over their frequency spectrum, we reinforce the system against all sources of technical noise and enable a long-term stable operation. This document details our comprehensive design approach and validates the scalability and functionality of our electronic-photonic quantum light source through experimental demonstrations.
Additionally, I present a theoretical design of a classical passive device that can achieve unprecedented laser linewidth narrowing at high efficiency. Through utilization of resonators defined by guiding material with a strong chi(2) nonlinearity and Q-engineering, we predict that the optical parametric oscillation (OPO) can efficiently convert the input laser light into two output waves, while all the laser noise is transferred in one of the output waves. I present analytical expression relating the conversion efficiency of the OPO process to the achieved linewidth narrowing, while taking into the account the underlying material platform and the quality of the optical resonator. This part of my research opens new avenues for precision laser applications, enhancing the prospects for simpler and inexpensive low-noise lasers.
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Attribution 4.0 International