Prof Andrew Steane

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, ...

Abstract:

We describe and implement a method to restore the state of a single qubit, in principle perfectly, after it has partially collapsed. The method resembles the classical Hahn spin-echo, but works on a wider class of relaxation processes, in which the quantum state partially leaves the computational Hilbert space. It is not guaranteed to work every time, but successful outcomes are heralded. We demonstrate using a single trapped ion better performance from this recovery method than can be obtained employing projection and post-selection alone. The demonstration features a novel qubit implementation that permits both partial collapse and coherent manipulations with high fidelity.