Coherent control of solid-state spin qubits for quantum photonic applications

Optically-active spins in the solid-state are useful resources for quantum technologies, including quantum computing, networking, and sensing. In particular, artificial atoms and molecules in direct bandgap semiconductors can be used to generate single photons with high efficiency and indistinguishability, as well as entangled photon states for the realization of quantum algorithms. Ideal spin systems for such applications must combine high quality optical and spin properties, and an efficient method for coherently controlling the spin. In this talk, I will describe the methods for coherently controlling optically-active spin qubits in quantum photonic platforms.

First, I will present an all-optical Raman-based realization of such coherent control for the high frequency noise spectroscopy of solid-state spins. The physical understanding of solid-state environments gained by such noise spectroscopy is essential for the development of spin qubits with long coherence times in noisy environments.

After discussing these fundamental studies, I will describe the ongoing research directions aimed at coupling solid-state spins to fabricated photonic structures for the implementation of multi-pulse control sequences for quantum information processing, as well as for the deterministic generation of spin-photon entanglement on-chip. In particular, I will present the potential of gratings fabricated in charge tunable devices for upgrading the photonic interface of optically-active spin systems.

Finally, I will introduce novel systems with promising spin and optical properties that remain highly unexplored, such as telecom wavelength emitters and self-assembled quantum dot molecules. Coherently controlling the spin of such systems embedded in photonic structures could enable the realization of novel pulse sequences for high resolution sensing, quantum information processing, and quantum networking.