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.
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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 formulate.
I provided 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.
This reformulation motivated taking a look at the issue of composition in physics. Typically, when we study a physical object, we regard it as being built out of small objects joined together in a particular way. Such ideas of composition may play a role across different fields in physics.
I am currently working on reformulating General Relativity as a probabilistic theory with agency. The Probabilities can be thought of as being a consequence of ignorance (the underlying theory remaining deterministic). Agency (the possibility of making different choices) is built into quantum theory (we choose which measurement to make). We can also build it into General Relativity.
The aim of reformulating both QT and GR in similar terms is, of course, to help find a theory of quantum gravity (which has QT and GR as limiting cases.