51 citations · 225 across the 15 of their papers we have counts for
15 papers
An Operational Resolution of the Third-Particle Paradox
Časlav Brukner, Esteban Castro-Ruiz, Marius Krumm
We give an operational resolution of the third-particle paradox, relevant in the theory of quantum reference frames. The apparent paradox is that a system which is irrelevant in on…
Towards interpretable quantum machine learning via single-photon quantum walks
Fulvio Flamini, Marius Krumm, Lukas J. Fiderer +2
Variational quantum algorithms represent a promising approach to quantum machine learning where classical neural networks are replaced by parametrized quantum circuits. However, bo…
The Min-Entropy of Classical-Quantum Combs for Measurement-Based Applications
Isaac D. Smith, Marius Krumm, Lukas J. Fiderer +2
Learning a hidden property of a quantum system typically requires a series of interactions. In this work, we formalise such multi-round learning processes using a generalisation of…
Quantum teleportation of quantum causal structures
Marius Krumm, Philippe Allard Guérin, Thomas Zauner +1
Quantum teleportation is a very helpful information-theoretic protocol that allows to transfer an unknown arbitrary quantum state from one location to another without having to tra…
Internal quantum reference frames for finite Abelian groups
Philipp A. Hoehn, Marius Krumm, Markus P. Mueller
Employing internal quantum systems as reference frames is a crucial concept in quantum gravity, gauge theories and quantum foundations whenever external relata are unavailable. In…
Noncausal Page-Wootters circuits
Veronika Baumann, Marius Krumm, Philippe Allard Guérin +1
One of the most fundamental open problems in physics is the unification of general relativity and quantum theory to a theory of quantum gravity. An aspect that might become relevan…
Free agency and determinism: is there a sensible definition of computational sourcehood?
Marius Krumm, Markus P. Mueller
Can free agency be compatible with determinism? Compatibilists argue that the answer is yes, and it has been suggested that the computer science principle of "computational irreduc…
Quantum Darwinism and the spreading of classical information in non-classical theories
Roberto D. Baldijao, Marius Krumm, Andrew J. P. Garner +1
Quantum Darwinism posits that the emergence of a classical reality relies on the spreading of classical information from a quantum system to many parts of its environment. But what…
Quantum reference frame transformations as symmetries and the paradox of the third particle
Marius Krumm, Philipp A. Hoehn, Markus P. Mueller
In a quantum world, reference frames are ultimately quantum systems too -- but what does it mean to "jump into the perspective of a quantum particle"? In this work, we show that qu…
Semi-device-independent information processing with spatiotemporal degrees of freedom
Andrew J. P. Garner, Marius Krumm, Markus P. Mueller
Nonlocality, as demonstrated by the violation of Bell inequalities, enables device-independent cryptographic tasks that do not require users to trust their apparatus. In this artic…
Composition rules for quantum processes: a no-go theorem
Philippe Allard Guérin, Marius Krumm, Costantino Budroni +1
A quantum process encodes the causal structure that relates quantum operations performed in local laboratories. The process matrix formalism includes as special cases quantum mecha…
Quantum computation is the unique reversible circuit model for which bits are balls
Marius Krumm, Markus P. Mueller
The computational efficiency of quantum mechanics can be defined in terms of the qubit circuit model, which is characterized by a few simple properties: each computational gate is…
Thermodynamics and the structure of quantum theory
Marius Krumm, Howard Barnum, Jonathan Barrett +1
Despite its enormous empirical success, the formalism of quantum theory still raises fundamental questions: why is nature described in terms of complex Hilbert spaces, and what mod…
Thermodynamics and the Structure of Quantum Theory as a Generalized Probabilistic Theory
Marius Krumm
This thesis investigates the connection between quantum theory, thermodynamics and information theory. Theories with structure similar to that of quantum theory are considered, mat…
Entropy, majorization and thermodynamics in general probabilistic theories
Howard Barnum, Jonathan Barrett, Marius Krumm +1
In this note we lay some groundwork for the resource theory of thermodynamics in general probabilistic theories (GPTs). We consider theories satisfying a purely convex abstraction…