Thomas Babinec, Department of Applied Physics, Stanford University
Quantum Photonic Devices Based on Single Dopants in Solids
Tremendous progress has been made in the development of high-purity semiconductor materials so that their optoelectronic properties can now be controlled at the level of a single active dopant. These individual impurities, which are quantum systems embedded in a solid-state host, possess diverse applications in quantum information science and technology. As a simple and noteworthy example, single photons emitted from an optically active dopant may be used to share secure bits via quantum cryptographic key distribution. In this talk, I highlight several approaches towards realizing quantum photonic devices based on single dopants in solids. I describe several photonic device architectures for improving the performance of these systems, including nanowire waveguides offering high single photon collection efficiency, ultrasmall mode volume nanometallic resonators and high quality factor photonic crystals cavities offering spontaneous emission rate enhancement. Coupling these nanophotonic devices to quantum systems such as single color centers and epitaxial quantum dots may be achieved via classical materials science techniques such as ion implantation and molecular beam epitaxy. Finally, these ingredients may be mixed in diverse and technologically relevant materials such as diamond, gallium arsenide and silicon carbide. All together, these are proof-of-concept demonstrations that tools of photonic engineering, materials science and nanoscience may be applied to emerging problems in quantum information science and technology.
Thomas (Tom) Babinec received a B.S. with highest honors in physics and mathematics from The University of Michigan in 2007, and a PhD in applied physics from Harvard University in 2012. In 2007 he was awarded a National Defense Science and Engineering Graduate fellowship in physics as well the National Science Foundation Graduate student fellowship in materials science. He is currently a Nanoscale and Quantum Science and Engineering Fellow at the Stanford Department of Applied Physics. His research interests focus on aspects of nanophotonics, defects and dopants in semiconductors and quantum science.
Invited by the Department of Electrical and Computer Engineering and the Institute for Quantum Computing