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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: Lucien Hardy


The theory of composition in physics
Speaker(s): Lucien Hardy
Abstract: We develop a theory for describing composite objects in physics. These can be static objects, such as tables, or things that happen in spacetime (such as a region of spacetime with fields on it regarded as being composed of smaller such regions joined together). We propose certain fundamen... read more
Date: 16/04/2013 - 3:30 pm

Quantum Theory - Lecture 7
Speaker(s): Lucien Hardy
Abstract:
Date: 20/09/2011 - 1:30 pm

Quantum Theory - Lecture 6
Speaker(s): Lucien Hardy
Abstract:
Date: 19/09/2011 - 1:30 pm

Researcher Presentation: Lucien Hardy
Speaker(s): Lucien Hardy
Abstract:
Date: 02/09/2011 - 1:30 pm

Part 2: Reformulating and reconstructing quantum theory
Speaker(s): Lucien Hardy
Abstract: I provide a reformulation of finite dimensional quantum theory in the circuit framework in terms of mathematical axioms, and a reconstruction of quantum theory from operational postulates. The mathematical axioms for quantum theory are the following: [Axiom 1] Operations correspond to operators. [Ax... read more
Date: 18/05/2011 - 11:00 am

Part 1: Reformulating and reconstructing quantum theory
Speaker(s): Lucien Hardy
Abstract: I provide a reformulation of finite dimensional quantum theory in the circuit framework in terms of mathematical axioms, and a reconstruction of quantum theory from operational postulates. The mathematical axioms for quantum theory are the following: [Axiom 1] Operations correspond to operators. [Ax... read more
Date: 09/05/2011 - 10:50 am

Reconstructing quantum theory from reasonable postulates.
Speaker(s): Lucien Hardy
Abstract: I will give a new set of operational postulates from which quantum theory can be reconstructed. These are (1) Definiteness: There is a one-to-one correspondence between the set of pure states and the set of maximal effects such that we get probability one for a pure state followed the corresponding ... read more
Date: 19/04/2011 - 2:00 pm

Foundations of Quantum Mechanics - Lecture 5
Abstract:
Date: 07/01/2011 - 11:30 am

Turning pictures into calculations: the duotensor framework
Speaker(s): Lucien Hardy
Abstract: A picture can be used to represent an experiment. In this talk we will consider such pictures and show how to turn them into pictures representing calculations (in the style of Penrose's diagrammatic tensor notation). In particular, we will consider circuits described probabilistically. A circuit re... read more
Date: 07/12/2010 - 4:00 pm

PIRSA:09100195  ( Flash Presentation , MP3 , PDF ) Which Format?
Meet a Scientist - Prof. Lucien Hardy
Speaker(s): Lucien Hardy
Abstract: Applying the lessons learned in quantum information theory to gain a better understanding of quantum mechanics itself. Is quantum theory simply a new type of probability theory? Exploring new directions towards combining quantum theory with gravity.
Date: 05/10/2009 - 2:40 am
Collection: Meet a Scientist

Operational structures and Natural Postulates for Quantum Theory
Speaker(s): Lucien Hardy
Abstract: TBA
Date: 14/08/2009 - 9:00 am

Quantum Physics
Speaker(s): Lucien Hardy
Abstract: Quantum theory is the most accurate scientific theory humanity has ever devised. But it is also the most mysterious. No one knows what the underlying picture of reality at quantum level is. This presentation will introduce you to some of the many interpretations of quantum theory that scientists hav... read more
Date: 05/08/2009 - 10:45 am
Collection: EinsteinPlus 2009

Operational structures as a foundation for probabilistic theories
Speaker(s): Lucien Hardy
Abstract: Work on formulating general probabilistic theories in an operational context has tended to concentrate on the probabilistic aspects (convex cones and so on) while remaining relatively naive about how the operational structure is built up (combining operations to form composite systems, and so on). I... read more
Date: 02/06/2009 - 9:30 am

Operationalism and Quantum Gravity
Speaker(s): Lucien Hardy
Abstract:
Date: 05/06/2007 - 4:30 pm

Causality in quantum theory and beyond: towards a theory of quantum gravity
Speaker(s): Lucien Hardy
Abstract: The way we combine operators in quantum theory depends on the causal relationship involved. For spacelike separated spacetime regions we use the tensor product. For immediately sequential regions of spacetime we use the direct product. In the latter case we lose information – that is we cannot g... read more
Date: 19/07/2006 - 11:45 am

Welcome
Abstract:
Date: 18/07/2006 - 9:00 am

Quantum Information Theory 1
Speaker(s): Lucien Hardy
Abstract:
Date: 09/06/2006 - 1:30 pm

Generalised Probability Theories as a setting for Quantum Theory and other theories.
Speaker(s): Lucien Hardy
Abstract:
Date: 21/07/2005 - 2:00 pm

Interpretation of Quantum Theory: Lecture 21
Speaker(s): Lucien Hardy
Abstract:
Date: 22/03/2005 - 2:15 pm
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