Lucien Hardy received his PhD at Durham University in 1992 under the supervision of Professor Euan J Squires. He has held research and lecturing positions in various cities across Europe. While in Rome Lucien collaborated on an experiment to demonstrate quantum teleportation. In 1992 he found a very simple proof of non-locality in quantum theory which has become known as Hardys theorem.
I am working on operational approaches to quantum theory and quantum gravity. Specifically I am developing an operational framework in which it is hoped that quantum theory, probabilistic general relativity, and ultimately quantum gravity can be formulated.
Most recently I have given a new reformulation of quantum theory in which operators are associated with general fragments of circuits (this unifies the treatment of states, transformations, and measurements as examples of a more general type of object in quantum theory). Additionally, I showed how quantum theory follows from a set of five natural postulates posed in operational language and applied to the circuit framework (this is a framework in which boxes representing operations are joined by wires representing the passage of systems). This builds on work from ten years earlier where I also gave a simple set of postulates for quantum theory within the context of an more basic operational framework. I am also interested in ontological implications of quantum theory as well as the question of how information processing tasks can teach us about the issue of causal structure in quantum theory.
The operational approach to physics should be applicable to the problem of finding a theory of quantum gravity. The approach I am pursuing is the following. First, find a general operational framework for probabilistic physical theories in which we can have indefinite causal structure. It is hoped that this will be hospitable to a theory of quantum gravity. Then, second, attempt to come up with postulates that can be posed in the context of such a general framework that might narrow us down to a theory of quantum gravity.