NBIA Colloquium by Charles Marcus (Harvard and NBI) – Niels Bohr Institute - University of Copenhagen

Niels Bohr Institute > Calendar > 2011 > Decoupling a spin qubi...

NBIA Colloquium by Charles Marcus (Harvard and NBI)

Speaker: Charles Marcus (Harvard and NBI)

Title: Decoupling a spin qubit from a noisy environment

Abstract: The goal of building a large, interconnected, controllable quantum system is immensely challenging, but may initiate a new realm of technology, one in which quantum coherence serves as a resource. In this talk, after motivating the use of the electron spin as a state variable on which to build such a large quantum system, we examine how the coupling of electron spin to its environment leads to a loss of coherence. General methods for counteracting decoherence known as dynamical decoupling have been developed, beginning with the famous "spin echo" of Hahn in 1950. We apply these to the spin qubit problem, and find some new interesting relations and experimental results.