|Wednesday, May 14, 2014|
The aim of the talk is to give a clear-cut definition of Bell’s notion of local causality. Having provided a framework, called local physical theory, which integrates probabilistic and spatiotemporal concepts, we formulate the notion of local causality and relate...
We present a purely diagrammatic account on quantum theory. The conceptual underpinning is to take composition of systems as the primitive connective, having drawn lessons from some of the shortcomings of other axiomatic approaches. The symbolic underpinning of the approach...
I propose a general geometric framework in which to discuss the existence of time observables. This frameworks allows one to describe a local sense in which time observables always exist, and a global sense in which they can sometimes exist...
What is the correct possibility space for a given particle of a quantum field? The firm orthodoxy, initiated by Wigner in 1939, is that we should look to the irreducible representations of the Poincaré group. But the justifications for this...
How much of an advantage can quantum mechanics give over its classical counterpart? This very much depends on the task and measure under consideration. Take, for example, communication protocols where two players are given inputs x and y respectively and...
Bayesian networks provide a powerful tool for reasoning about probabilistic causation, used in many areas of science. They are, however, intrinsically classical. In particular, Bayesian networks naturally yield the Bell inequalities. Inspired by this connection, we generalise the formalism of...
The superiority of quantum computers over classical ones disappears when the quantum system is subjected to noise. At sufficiently high noise levels, the classical computer can efficiently simulate the noisy quantum statistics. One way of defining this noise threshold is...