Prof Andrew Steane

Abstract:

We present a partial differential equation describing the electromagnetic potentials around a charge distribution undergoing rigid motion at constant proper acceleration, and obtain a set of solutions to this equation. These solutions are used to find the self-force exactly in a chosen case. The electromagnetic self-force for a spherical shell of charge of proper radius R undergoing rigid motion at constant proper acceleration a0 is, to high-order approximation, (2e2a0/R) ∑∞n=0 (a0R)2n((2n - 1)(2n + 1)2(2n + 3))-1, and this is conjectured to be exact. © 2013 The Author(s) Published by the Royal Society. All rights reserved.

Abstract:

We propose a surface ion trap design incorporating microwave control electrodes for near-field single-qubit control. The electrodes are arranged so as to provide arbitrary frequency, amplitude and polarization control of the microwave field in one trap zone, while a similar set of electrodes is used to null the residual microwave field in a neighbouring zone. The geometry is chosen to reduce the residual field to the 0.5% level without nulling fields; with nulling, the crosstalk may be kept close to the 0.01% level for realistic microwave amplitude and phase drift. Using standard photolithography and electroplating techniques, we have fabricated a proof-of-principle electrode array with two trapping zones. We discuss requirements for the microwave drive system and prospects for scalability to a large two-dimensional trap array.

Abstract:

What I want to do in this chapter is show why the above statements, though partly understandable, are largely mistaken, and I will comment on how the combination of science and faith, in the case of one trying to follow Jesus of Nazareth, ...