Electron-Nuclear Spin Qubits and their manipulation by Magnetic Resonance Techniques

Dr. Johan van Tol
National High Magnetic Field Laboratory
Florida State University

With the decrease in size, current silicon technology is approaching fundamental and technological limits. One avenue for progress is spintronics, using the spin rather than the charge of the electron for information processing. Another avenue is quantum information processing, or quantum computing. The latter does not necessarily involve spins, but many of the proposed schemes do, because the coupling of the spin degrees of freedom to the surroundings can be very small, which allows quantum states and thus quantum information to persist for relatively long times, even within the ‘noisy’ surroundings of a liquid or solid.

In this seminar the focus will be on magnetic resonance experiments of spin systems in the solid state, like phosphorus or bismuth in silicon, and the use of both their electron and nuclear spins as quantum bits (qubits). Especially at high magnetic fields there are efficient ways to initialize, to manipulate, to read out these spin systems, and store information on the timescale of minutes. Finally, future prospects will be discussed, like the use of high power sources like Free-Electron Lasers to drive electron spins system with very short pulses.