Stefan Wolf
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View article: Flow of dynamical causal structures with an application to correlations
Flow of dynamical causal structures with an application to correlations Open
Causal models capture cause-effect relations both qualitatively—via the graphical —and quantitatively—via the . They offer a powerful framework for analyzing and constructing processes. Here, we introduce a tool—the flow of causal structur…
View article: Temperature as joules per bit
Temperature as joules per bit Open
In statistical mechanics, entropy is defined as a fundamental quantity. However, its unit, J/K, involves that of temperature, which is only subsequently defined—and defined in terms of entropy. This circularity arises with the introduction…
View article: On multivariate polynomials achievable with quantum signal processing
On multivariate polynomials achievable with quantum signal processing Open
Quantum signal processing (QSP) is a framework which was proven to unify and simplify a large number of known quantum algorithms, as well as discovering new ones. QSP allows one to transform a signal embedded in a given unitary using polyn…
View article: Local theories with parallel realities and the epistemic view of the quantum state
Local theories with parallel realities and the epistemic view of the quantum state Open
Hidden-variable theories effectively solve the measurement problem. However, a serious issue of this route towards a realistic completion of quantum theory is raised by Bell's proof that the resulting theories are nonlocal. A possible reso…
View article: Shot-noise reduction for lattice Hamiltonians
Shot-noise reduction for lattice Hamiltonians Open
Efficiently estimating energy expectation values of lattice Hamiltonians on quantum computers is a serious challenge, where established techniques can require excessive sample numbers. Here we introduce geometric partitioning as a scalable…
View article: Flow of dynamical causal structures with an application to correlations
Flow of dynamical causal structures with an application to correlations Open
Causal models capture cause-effect relations both qualitatively - via the graphical causal structure - and quantitatively - via the model parameters. They offer a powerful framework for analyzing and constructing processes. Here, we introd…
View article: Temperature as Joules per Bit
Temperature as Joules per Bit Open
In statistical mechanics, entropy is defined as a fundamental quantity. However, its unit, J/K, involves that of temperature, which is only subsequently defined - and defined in terms of entropy. This circularity arises with the introducti…
View article: Quantum-foundational implications of information erasure upon measurement
Quantum-foundational implications of information erasure upon measurement Open
A projective measurement cannot decrease the von Neumann entropy if the outcome is ignored. However, under certain sound assumptions and using the quantum violation of Leggett-Garg inequalities, we have previously demonstrated that this pr…
View article: Unconditional Proofs-of-Work and Other Possibilities of Thermodynamic Cryptography
Unconditional Proofs-of-Work and Other Possibilities of Thermodynamic Cryptography Open
In line with advances in recent years about realizing cryptographic functionalities in an information-theoretically secure way from physical phenomena and laws, we propose here to obtain useful tasks from the sole assumption of limited fre…
View article: An Algebraic-Geometry Approach to Prime Factorization
An Algebraic-Geometry Approach to Prime Factorization Open
New algorithms for prime factorization that outperform the existing ones or take advantage of particular properties of the prime factors can have a practical impact on present implementations of cryptographic algorithms that rely on the co…
View article: Generalized Gleason theorem and finite amount of information for the context
Generalized Gleason theorem and finite amount of information for the context Open
Quantum processes cannot be reduced, in a nontrivial way, to classical processes without specifying the context in the description of a measurement procedure. This requirement is implied by the Kochen-Specker theorem in the outcome-determi…
View article: Key Agreement and Oblivious Transfer from Free-Energy Limitations
Key Agreement and Oblivious Transfer from Free-Energy Limitations Open
We propose one of the very few constructive consequences of the second law of thermodynamics. More specifically, we present protocols for secret-key establishment and multiparty computation the security of which is based fundamentally on L…
View article: Thermodynamics as Combinatorics: A Toy Theory
Thermodynamics as Combinatorics: A Toy Theory Open
We discuss a simple toy model which allows, in a natural way, for deriving central facts from thermodynamics such as its fundamental laws, including Carnot's version of the second principle. Our viewpoint represents thermodynamic systems a…
View article: Discrete Mathematics
Discrete Mathematics Open
In this volume, the authors present a self-contained introduction to discrete mathematics – the science of finite and countably infinite structures. In addition to taking a theoretical approach, they also include many practical exercises. …
View article: C3.1 Mid-infrared Dual-comb Spectroscopy as Sensor: Fast and Precise Quantification of Multiple Gases
C3.1 Mid-infrared Dual-comb Spectroscopy as Sensor: Fast and Precise Quantification of Multiple Gases Open
Dual-comb spectroscopy allows to record broadband transmission spectra fast and precisely. This bridges the gap between classical methods, where Fourier-Transform infrared spectroscopy excels in spectral bandwidth or tunable laser absorpti…
View article: On the Advantage of Irreversible Processes in Single-System Games
On the Advantage of Irreversible Processes in Single-System Games Open
The CHSH no-signalling game studies Bell nonlocality by showcasing a gap between the win rates of classical strategies, quantum-entangled strategies, and no-signalling strategies. Similarly, the CHSH* single-system game explores the advant…
View article: Wigner's Isolated Friend
Wigner's Isolated Friend Open
The measurement problem is seen as an ambiguity of quantum mechanics, or, beyond that, as a contradiction within the theory: Quantum mechanics offers two conflicting descriptions of the Wigner's-friend experiment. As we argue in this note …
View article: Free energy of a general computation
Free energy of a general computation Open
Starting from Landauer's slogan "information is physical," we revise and modify Landauer's principle stating that the erasure of information has a minimal price in the form of a certain quantity of free energy. We establish a direct link b…
View article: Measuring Measuring
Measuring Measuring Open
Measurements play a crucial role in doing physics: Their results provide the basis on which we adopt or reject physical theories. In this note, we examine the effect of subjecting measurements themselves to our experience. We require that …
View article: Reversible time travel with freedom of choice
Reversible time travel with freedom of choice Open
General relativity allows for the existence of closed time-like curves, along which a material object could travel back in time and interact with its past self. This possibility raises the question whether certain initial conditions, or mo…
View article: Proving Erasure
Proving Erasure Open
It seems impossible to certify that a remote hosting service does not leak\nits users' data --- or does quantum mechanics make it possible? We investigate\nif a server hosting data can information-theoretically prove its definite\ndeletion…
View article: No master (key) No (measurement) problem
No master (key) No (measurement) problem Open
Can normal science-in the Kuhnian sense-add something substantial to the discussion about the measurement problem? Does an extended Wigner's-friend Gedankenexperiment illustrate new issues? Or a new quality of known issues? Are we led to n…
View article: Proving Erasure
Proving Erasure Open
It seems impossible to certify that a remote hosting service does not leak its users' data --- or does quantum mechanics make it possible? We investigate if a server hosting data can information-theoretically prove its definite deletion us…
View article: Contextuality: It's a Feature, not a Bug
Contextuality: It's a Feature, not a Bug Open
Results of measurements give legitimacy to a physical theory. What if acquiring these results in the first place necessitates what the same theory considers to be an interaction? In this note, we assume that theories account for interactio…
View article: Disturbance: It's a Feature, not a Bug
Disturbance: It's a Feature, not a Bug Open
Results of measurements give legitimacy to a physical theory: What if acquiring these results in the first place necessitates what the same theory considers to be an interaction? In this note, we assume that theories account for interactio…
View article: Discrimination of Non-Local Correlations
Discrimination of Non-Local Correlations Open
In view of the importance of quantum non-locality in cryptography, quantum computation, and communication complexity, it is crucial to decide whether a given correlation exhibits non-locality or not. As proved by Pitowski, this problem is …
View article: Sensitization of the Angiotensin II AT1 Receptor Contributes to RKIP-Induced Symptoms of Heart Failure
Sensitization of the Angiotensin II AT1 Receptor Contributes to RKIP-Induced Symptoms of Heart Failure Open
Inhibition of the G-protein-coupled receptor kinase 2 (GRK2) is an emerging treatment approach for heart failure. Therefore, cardio-protective mechanisms induced by GRK2 inhibition are under investigation. We compared two different GRK2 in…
View article: On Formalisms and Interpretations
On Formalisms and Interpretations Open
One of the reasons for the heated debates around the interpretations of quantum theory is a simple confusion between the notions of formalism interpretation. In this note, we make a clear distinction between them and show that there are a…