PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
Subscribe to podcastIndefinite Causal Structure
Organizer(s): Lucien Hardy Robert Mann
Collection URL: http://pirsa.org/C19049
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 | Welcome and Opening Remarks Speaker(s):
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Date: 09/12/2019 - 9:00 am
Collection: Indefinite Causal Structure
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 | 10 years of the quantum SWITCH: state of the art and new perspectives Speaker(s): Giulio Chiribella
Abstract: The quantum SWITCH is the simplest example of indefinite causal structure. Technically, it is a higher-order transformation that takes two physical processes A and B in input and combines them in a coherent superposition of two alternative orders, AB and BA. In the past decade, the quantum SWITCH ha... read more
Date: 09/12/2019 - 9:10 am
Collection: Indefinite Causal Structure
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 | Cyclic quantum causal models and violations of causal inequalities Speaker(s): Ognyan Oreshkov
Abstract: I will present an extension of the recent theory of quantum causal models to cyclic causal structures. This offers a novel causal perspective on processes beyond those corresponding to standard circuits, such as processes with dynamical causal order and causally nonseparable processes, including pro... read more
Date: 09/12/2019 - 10:00 am
Collection: Indefinite Causal Structure
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 | TBA Speaker(s): Laura Henderson
Abstract:
Date: 09/12/2019 - 11:20 am
Collection: Indefinite Causal Structure
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 | Composing causal orderings Speaker(s): Aleks Kissinger
Abstract: When studying (definite or indefinite) causal orderings of processes, it is often useful to consider higher-order processes, i.e. processes which take other processes as their input. However, as a recent no-go result of Guerin et al indicates, our naive first-order notions of "composition" of proces... read more
Date: 09/12/2019 - 2:00 pm
Collection: Indefinite Causal Structure
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 | Quantum principle of relativity Speaker(s): Andrzej Dragan
Abstract:
Date: 09/12/2019 - 2:50 pm
Collection: Indefinite Causal Structure
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 | Quantum mechanics and the covariance of physical laws in quantum reference frames Speaker(s): Flaminia Giacomini
Abstract: In physics, every observation is made with respect to a frame of reference. Although reference frames are usually not considered as degrees of freedom, in all practical situations it is a physical system which constitutes a reference frame. Can a quantum system be considered as a reference frame and... read more
Date: 09/12/2019 - 4:00 pm
Collection: Indefinite Causal Structure
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 | What happens when we quantize time? Speaker(s): Alexander Smith
Abstract: The lesson of general relativity is background independence: a physical theory should not be formulated in terms of external structures. This motivates a relational approach to quantum dynamics, which is necessary for a quantum theory of gravity. Using a covariant POVM to define a time observable, I... read more
Date: 10/12/2019 - 9:00 am
Collection: Indefinite Causal Structure
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 | Levitating microdiamonds towards testing the macroscopic limits of the quantum superposition principle Speaker(s): Gavin Morley
Abstract: We are building an experiment in which a levitated 1 µm diamond containing a nitrogen vacancy (NV) centre would be put into a spatial quantum superposition [1-3]. This would be able to test theories of spontaneous wavefunction collapse [4]. We have helped theory collaborators to propose how to do t... read more
Date: 10/12/2019 - 9:50 am
Collection: Indefinite Causal Structure
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 | TBA Speaker(s): Ding Jia
Abstract:
Date: 10/12/2019 - 11:20 am
Collection: Indefinite Causal Structure
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