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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: Ognyan Oreshkov


PIRSA:19120019  ( MP4 Medium Res , MP3 , PDF ) Which Format?
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

PIRSA:18080028  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Time-delocalized quantum subsystems and operations: on the existence of processes with indefinite causal structure in quantum mechanics
Speaker(s): Ognyan Oreshkov
Abstract: It was recently found that it is theoretically possible for there to exist higher-order quantum processes in which the operations performed by separate parties cannot be ascribed a definite causal order. Some of these processes are believed to have a physical realization in standard quantum mechanic... read more
Date: 03/08/2018 - 10:00 am

PIRSA:16020112  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Quantum theory with indefinite causal structure
Speaker(s): Ognyan Oreshkov
Abstract: Quantum theory can be understood as a theory of information processing in the circuit framework for operational probabilistic theories. This approach presupposes a definite casual structure as well as a preferred time direction. But in general relativity, the causal structure of space-time is dynami... read more
Date: 16/02/2016 - 3:30 pm

PIRSA:13110057  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Quantum mechanics as an operationally time symmetric probabilistic theory
Speaker(s): Ognyan Oreshkov
Abstract: The standard formulation of quantum mechanics is operationally asymmetric with respect to time reversal---in the language of compositions of tests, tests in the past can influence the outcomes of test in the future but not the other way around. The question of whether this represents a fundament... read more
Date: 12/11/2013 - 3:30 pm
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