Alp Sipahigil (Advisor)

Achieving high-performance quantum computing with superconducting qubits requires a good understanding of the various loss mechanisms that can degrade qubit performance. One such potential loss mechanism is undesired electromechanical coupling mediated by piezoelectric effects. It can occur even in centrosymmetric materials due to interface symmetry breaking. In our recent cryogenic microwave transmission measurements, we observed such interface piezoelectricity at the aluminum-silicon and aluminum-sapphire heterostructures, a widely used material combination in superconducting qubit...

Entanglement distribution is central to the modular scaling of quantum processors and establishing quantum networks. Color centers with telecom-band transitions and long spin coherence times are suitable candidates for long-distance entanglement distribution. However, high-bandwidth memory-enhanced quantum communication is limited by high-yield, scalable creation of efficient spin-photon interfaces. Here, we develop a silicon photonics platform consisting of arrays of bus-coupled cavities. The coupling to a common bus waveguide enables simultaneous access to individually addressable cavity...