Format results
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Can reality depend on the observer? Lessons from QBism and Relational Quantum Mechanics (RQM)
Jacques Pienaar - University of Massachusetts Boston
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Three ways to classicalize (nearly) any probabilistic theory
Alexander Wilce - Susquehanna University
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Time symmetry in operational theories
Lucien Hardy - Perimeter Institute for Theoretical Physics
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The Stabilizer Subtheory Has a Unique Noncontextual Model
David Schmid - Perimeter Institute for Theoretical Physics
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Ontic Structural Realism and Quantum Mechanics
James Ladyman - University of Bristol
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An Information-Theoretic Approach to Contextuality
Iman Marvian - Duke University
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Entanglement in prepare-and-measure scenarios
Armin Tavakoli - Stockholm University
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Quantum and classical causal agents
Sally Shrapnel - University of Queensland
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Multi-agent paradoxes beyond quantum theory
Vilasini Venkatesh - University of York
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Can reality depend on the observer? Lessons from QBism and Relational Quantum Mechanics (RQM)
Jacques Pienaar - University of Massachusetts Boston
There are many different interpretations of quantum mechanics. Among them, QBism and Rovelli's Relational Quantum Mechanics (RQM) are special because they both propose that reality itself is produced relative to "observers". For QBism, observers are defined as rational decision-making "agents"… -
A quantum prediction as a collection of epistemically restricted classical predictions
William Braasch - Dartmouth College
A toy model due to Spekkens is constructed by applying an epistemic restriction to a classical theory but reproduces a host of phenomena that appear in quantum theory. The model advances the position that the quantum state may be interpreted as a reflection of an agent’s knowledge. However, the… -
Three ways to classicalize (nearly) any probabilistic theory
Alexander Wilce - Susquehanna University
It is commonplace that quantum theory can be viewed as a ``non-classical" probability calculus. This observation has inspired the study of more general non-classical probabilistic theories modeled on QM, the so-called generalized probabilistic theories or GPTs. However, the boundary between these… -
Time symmetry in operational theories
Lucien Hardy - Perimeter Institute for Theoretical Physics
The standard operational probabilistic framework (within which Quantum Theory can be formulated) is time asymmetric. This is clear because the conditions on allowed operations include a time asymmetric causality condition. This causality condition enforces that future choices do not influence past… -
The Stabilizer Subtheory Has a Unique Noncontextual Model
David Schmid - Perimeter Institute for Theoretical Physics
We give a complete characterization of the (non)classicality of all stabilizer subtheories. First, we prove that there is a unique nonnegative and diagram-preserving quasiprobability representation of the stabilizer subtheory in all odd dimensions, namely Gross’s discrete Wigner function. This… -
Ontic Structural Realism and Quantum Mechanics
James Ladyman - University of Bristol
Ontic structural realism is a form of scientific realism based on quantum mechanics in two ways: (i) particles are not taken to be individual entities because they are not distinguishable; and, (ii) entanglement is taken to be relational structure that does not reduce to the state of parts and their… -
An Information-Theoretic Approach to Contextuality
Iman Marvian - Duke University
Classical probabilistic models of quantum systems are not only relevant for understanding the non-classical features of quantum mechanics, but they are also useful for determining the possible advantage of using quantum resources for information processing tasks. A common feature of these models is… -
Can a qubit be your friend? Why experimental metaphysics needs a quantum computer
Howard Wiseman - Griffith University
Experimental metaphysics is the study of how empirical results can reveal indisputable facts about the fundamental nature of the world, independent of any theory. It is a field born from Bell’s 1964 theorem, and the experiments it inspired, proving the world cannot be both local and deterministic… -
Entanglement in prepare-and-measure scenarios
Armin Tavakoli - Stockholm University
The prepare-and-measure scenario is ubiquitous in physics. However, beyond the paradigmatic example of dense coding, there is little known about the correlations p(b|x,y) that can be generated between a sender with input x and a receiver with input y and outcome b. Contrasting dense coding, we show… -
Quantum and classical causal agents
Sally Shrapnel - University of Queensland
Agency accounts of causation are often criticised as being unacceptably subjective: if there were no human agents there would be no causal relations, or, at the very least, if humans had been different then so too would causal relations. Here we describe a model of a causal agent that is not human… -
Characterising and bounding the set of quantum behaviours in contextuality scenarios
Victoria Wright - University of York
The predictions of quantum theory resist generalised noncontextual explanations. In addition to the foundational relevance of this fact, the particular extent to which quantum theory violates noncontextuality limits available quantum advantage in communication and information processing. In the… -
Multi-agent paradoxes beyond quantum theory
Vilasini Venkatesh - University of York
With ongoing efforts to observe quantum effects in larger and more complex systems, both for the purposes of quantum computing and fundamental tests of quantum gravity, it becomes important to study the consequences of extending quantum theory to the macroscopic domain. Frauchiger and Renner have…