11:04 a.m.
Cari amici,
This Wednesday, 21.2, we're happy to welcome Markus Frembs (again!) for a guest
lecture. Markus visited us last year to speak about a connection between entanglement and
time, and this time he'll tell us about a new geometric way of looking at
contextuality. Title and abstract below.
Join us in person or online at https://meet.jit.si/CQISeminarTalks
Warmly,
Will Schober
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Speaker: Markus Frembs (Okinawa Institute of Science and Technology)
Title: Coming full circle? A cyclic perspective on Kochen-Specker contextuality
Abstract
Contextuality is a key distinguishing feature between classical and quantum physics. As a
generalisation of nonlocality, it persistently fuels debates on quantum foundations. In
turn, understood as a resource for quantum computation, it is expected to hold the key to
quantum advantage. Yet, despite its long recognised importance in quantum foundations and,
more recently, in quantum computation, the essence of contextuality remains elusive: many
different mathematical frameworks exist, each addressing slightly different aspects of the
phenomenon, yet leaving various questions open.
In this talk, I will advocate a framework for contextuality, which subsumes various
existing notions and approaches. Within this framework, I will motivate and introduce a
conceptually new tool, which offers a fresh perspective on contextuality and captures its
essence geometrically. I will then draw a number of consequences from this idea. In
particular, I will resolve the apparent discrepancy between the original notion of
contextuality, as introduced by Kochen and Specker, and the modern notion captured by
noncontextuality inequalities.