September 11, 2013 at 9:46 am

Colloquium: Solid-State Qubit Coupled to a Photonic Crystal, Sept. 12

The Condensed Matter & Surface Sciences Colloquium Series presents Timothy M. Sweeney of the U.S. Naval Research Laboratory on Thursday, Sept. 12, at 4:10 p.m. in Walter Lecture Hall 245. Sweeney will discuss “Cavity Assisted Electron Spin Flip: A Solid-State Qubit Coupled to a Photonic Crystal.”

CMSS Colloquia“Optical cavities and waveguides in a photonic crystal provide a scalable solid state photonic architecture that could, for example, enable a quantum network,” says Sweeney. “Quantum dots can be readily incorporated into photonic crystal cavities. Many classic quantum electro-dynamics phenomenon have been demonstrated with charge neutral quantum dots, such as Purcell enhancement and strong coupling. However, the integration of charged quantum dots into a photonic crystal environment enriches the coupled system can lead to a spin-photon quantum interface, where the long-lived spin of the electron can serve as a qubit.

“In this seminar I will discuss our work with coupling a negatively charged quantum dot to an optical cavity. I will present optical spin initialization, coherent control and cavity-stimulated Raman scatter. Specifically, I will show that a cavity-stimulated Raman photon is accompanied by the spin flip of the electron. We obtain the regime in which the spin splitting in a magnetic field is larger than the cavity linewidth, which allows us to demonstrate cavity-stimulated Raman emission that is spin-dependent. This is an important step toward deterministic entanglement of distant quantum spin memories in a photonic crystal quantum network through the exchange of a Raman photon.”






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