Cryogenic Integrated Photonics

Integrated photonics at cryogenic temperatures provides new opportunities to interface light with quantum electronic, mechanical, and solid-state systems while exploiting reduced thermal noise and enhanced quantum coherence. Our research develops heterogeneous and nanophotonic platforms that combine optical, electronic, mechanical, and quantum-emitter functionality for operation from a few kelvin to millikelvin temperatures. We focus on efficient optical interfaces to superconducting quantum systems, semiconductor and two-dimensional quantum emitters, cavity-enhanced light-matter interactions, and integrated control and readout. These efforts aim to enable scalable cryogenic photonic interconnects, deterministic quantum light sources, single-photon nonlinearities and switching, and tightly integrated photonic–electronic architectures for quantum information science and sensing.

Current projects in the QPL include:

• Photonic interconnects for cryogenic superconducting qubits ([ed by Pintus at Cagliari / UCSB, collaboration with Google]
• InAs quantum dot nanophotonics and optomechanics [collaboration with Krenner group at Meunster and Bowers group at UCSB]
• Site-controlled single-photon emitters in 2D materials [collaboration Van de Walle group at UCSB, ORNL, UPenn]
• Towards single-photon switching and nonlinearity with hybrid 2D material / nanophotonic cavities [with UPenn]
• Integrated photonic and electronic integration of 2D quantum emitters