Quantum Foundations

This series consists of talks in the area of Foundations of Quantum Theory. Seminar and group meetings will alternate.

Seminar Series Events/Videos

TBA
Apr 28 2015 - 3:30pm
Room #: 294
Speaker(s):
Scientific Areas:
May 5 2015 - 3:30pm
Room #: 294
Speaker(s):
Scientific Areas:
TBA
May 13 2015 - 3:30pm
Room #: 294
Speaker(s):
Scientific Areas:
TBA
May 26 2015 - 3:30pm
Room #: 294
Speaker(s):
Scientific Areas:

 

Tuesday Apr 21, 2015
Speaker(s): 

We present a formal logic modeling some aspects of the behavior of the quantum measurement process, and study some properties of the models of this logic, from which we deduce some characteristics that any such model should verify. In the case of a Hilbert space of dimension at least 3, we then show that no model can lead to the prediction with certainty of more than one atomic outcome. Moreover, if the Hilbert space is finite dimensional, we can precisely describe the structure of the predictions of any model of our logic.

Collection/Series: 
Scientific Areas: 

 

Tuesday Mar 24, 2015
Speaker(s): 

This talk touches on three questions regarding the ontological status of quantum states using the ontological models

framework: it is assumed that a physical system has some underlying ontic state and that quantum states correspond to probability distributions over these ontic states.

Collection/Series: 
Scientific Areas: 

 

Tuesday Mar 17, 2015
Speaker(s): 

The last decade has seen a wave of characterizations of quantum theory using the formalism of generalized probability theory.

Collection/Series: 
Scientific Areas: 

 

Tuesday Jan 27, 2015

After a brief motivation of this question, the presentation is divided in two parts. We first introduce the principle of quantum information causality, which states the maximum amount of quantum information that a transmitted quantum system can communicate as a function of its Hilbert space dimension, independently of any quantum physical resources previously shared by the communicating parties.

Collection/Series: 
Scientific Areas: 

 

Tuesday Dec 02, 2014
Speaker(s): 

The Church-Turing thesis is one of the pillars of computer science; it postulates that every classical system has equivalent computability power to the so-called Turing machine. While this thesis is crucial for our understanding of computing devices, its implications in other scientific fields have hardly been explored. What if we consider the Church-Turing thesis as a law of nature?

Collection/Series: 
Scientific Areas: 

 

Thursday Nov 27, 2014
Speaker(s): 

Pure states and pure transformations play a crucial role in most of the recent reconstructions of quantum theory. In the frameworks of general probabilistic theories, purity is defined in terms of probabilistic mixtures and bears an intuitive interpretation of ``maximal knowledge" of the state of the system or of the evolution undergone by it.  On the other hand, many quantum features do not need the probabilistic structure of the theory.

Collection/Series: 
Scientific Areas: 

 

Tuesday Nov 25, 2014
Speaker(s): 

We present a first principles approach to a probabilistic description of nature based on two guiding principles: spacetime locality and operationalism. No notion of time or metric is assumed, neither any specific physical model. Remarkably, the emerging framework converges with the recently proposed positive formalism of quantum theory, obtained constructively from known quantum physics. However, it also seems to embrace classical physics.

Collection/Series: 
Scientific Areas: 

 

Tuesday Nov 18, 2014
Speaker(s): 

I will present a new approach to information-theoretic foundations of quantum theory, that does not rely on probability theory, spectral theory, or Hilbert spaces. The direct nonlinear generalisations of quantum kinematics and dynamics are constructed using quantum information geometric structures over algebraic states of W*-algebras (quantum relative entropies and Poisson structure). In particular, unitary evolutions are generalised to nonlinear hamiltonian flows, while Lueders? rules are generalised to constrained relative entropy maximisations.

Collection/Series: 
Scientific Areas: 

 

Tuesday Nov 04, 2014
Speaker(s): 

Interferometers capture a basic mystery of quantum mechanics: a single particle can exhibit wave behavior, yet that wave behavior disappears when one tries to determine the particle's path inside the interferometer. This idea has been formulated quantitatively as an inequality, e.g., by Englert and Jaeger, Shimony, and Vaidman, which upper bounds the sum of the interference visibility and the path distinguishability. Such wave-particle duality relations (WPDRs) are often thought to be conceptually inequivalent to Heisenberg's uncertainty principle, although this has been debated.

Collection/Series: 
Scientific Areas: 

 

Tuesday Nov 04, 2014
Speaker(s): 

Interferometers capture a basic mystery of quantum mechanics: a single particle can exhibit wave behavior, yet that wave behavior disappears when one tries to determine the particle's path inside the interferometer. This idea has been formulated quantitatively as an inequality, e.g., by Englert and Jaeger, Shimony, and Vaidman, which upper bounds the sum of the interference visibility and the path distinguishability. Such wave-particle duality relations (WPDRs) are often thought to be conceptually inequivalent to Heisenberg's uncertainty principle, although this has been debated.

Collection/Series: 
Scientific Areas: 

Pages