Evidence for the epistemic view of quantum states: A toy theory
- R. Spekkens
- 9 January 2004
We present a toy theory that is based on a simple principle: the number of questions about the physical state of a system that are answered must always be equal to the number that are unanswered in a…
Contextuality for preparations, transformations, and unsharp measurements
- R. Spekkens
- 23 June 2004
The Bell-Kochen-Specker theorem establishes the impossibility of a noncontextual hidden variable model of quantum theory, or equivalently, that quantum theory is contextual. In this paper, an…
Foundations of Quantum Mechanics
- R. Spekkens
- 26 July 2010
General Instructions Write your CANDIDATE NUMBER clearly on each of the THREE answer books provided. If an electronic calculator is used, write its serial number in the box at the top right hand…
Reference frames, superselection rules, and quantum information
This paper reviews the role of reference framesmore and superselection rules in the theory of quantum-information processing and finds that quantum unspeakable information becomes a new kind of resource that can be manipulated, depleted, quantified, etc.
Einstein, Incompleteness, and the Epistemic View of Quantum States
It is shown that for models wherein the quantum state has the status of something real, the failure of locality can be established through an argument considerably more straightforward than Bell’s theorem.
Towards a formulation of quantum theory as a causally neutral theory of Bayesian inference
Quantum theory can be viewed as a generalization of classical probability theory, but the analogy as it has been developed so far is not complete. Whereas the manner in which inferences are made in…
The lesson of causal discovery algorithms for quantum correlations: causal explanations of Bell-inequality violations require fine-tuning
The need for fine-tuning for most of the causal mechanisms that have been proposed to underlie Bell correlations, including superluminal causal influences, superdeterminism (that is, a denial of freedom of choice of settings), and retrocausal influences which do not introduce causal cycles are demonstrated.
Resource theory of quantum states out of thermal equilibrium.
- F. Brandão, M. Horodecki, J. Oppenheim, J. Renes, R. Spekkens
- PhysicsPhysical Review Letters
- 16 November 2011
It is shown that the free energy of thermodynamics emerges naturally from the resource theory of energy-preserving transformations, provided that a sublinear amount of coherent superposition over energy levels is available, a situation analogous to the sub linear amount of classical communication required for entanglement dilution.
The resource theory of informational nonequilibrium in thermodynamics
How to quantify coherence: Distinguishing speakable and unspeakable notions
A general framework for studying quantum coherence as a resource is presented, where coherence is classified as ``speakable'' or ``unspeakable'' based on whether or not the identity of the subspaces…