C2QA Colloquium

"Correlating materials analysis to eliminate sources of noise"

Presented by Nathalie de Leon, Princeton University

Wednesday, April 14, 2021, 1:30 pm — Videoconference / Virtual Event (see link below)

The nitrogen vacancy (NV) center in diamond exhibits spin-dependent fluorescence and long spin coherence times under ambient conditions, enabling applications in quantum information processing and sensing. NV centers near the surface can have strong interactions with external materials and spins, enabling new forms of nanoscale spectroscopy. However, NV spin coherence degrades within 100 nanometers of the surface, suggesting that diamond surfaces are plagued with ubiquitous defects. I will describe our recent efforts to correlate direct materials characterization with single spin measurements to devise methods to stabilize highly coherent NV centers within nanometers of the surface. We also deploy these shallow NV centers as a probe to study the dynamics of a disordered spin ensemble at the diamond surface. Our approach for correlating surface spectroscopy techniques with single qubit measurements to realize directed improvements is generally applicable to many systems, and time permitting, I will describe our recent efforts to tackle noise and microwave losses in superconducting qubits.

Hosted by: Steve Girvin

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