Quantum 6, 621 (2022). https://doi.org/10.22331/q-2022-01-11-621 The study of causal relations has recently been applied to the quantum realm, leading to the discovery that not all physical processes have a definite causal structure. While indefinite causal […]
Quantum 6, 620 (2022). https://doi.org/10.22331/q-2022-01-05-620 We introduce new methods and tools to study and characterise classical and quantum correlations emerging from prepare-and-measure experiments with informationally restricted communication. We consider the most general kind of informationally […]
Quantum 6, 619 (2022). https://doi.org/10.22331/q-2022-01-05-619 A set of multipartite orthogonal product states is locally irreducible, if it is not possible to eliminate one or more states from the set by orthogonality-preserving local measurements. An effective […]
Quantum 6, 618 (2022). https://doi.org/10.22331/q-2022-01-05-618 Mapping the decoding of quantum error correcting (QEC) codes to classical disordered statistical mechanics models allows one to determine critical error thresholds of QEC codes under phenomenological noise models. Here, […]
Quantum 6, 617 (2022). https://doi.org/10.22331/q-2022-01-04-617 A full quantum mechanical treatment of open quantum systems via a Master equation is often limited by the size of the underlying Hilbert space. As an alternative, the dynamics can […]
Quantum 6, 616 (2022). https://doi.org/10.22331/q-2022-01-03-616 A finite-dimensional quantum system is coupled to a bath of oscillators in thermal equilibrium at temperature $T>0$. We show that for fixed, small values of the coupling constant $lambda$, the […]
Quantum 6, 615 (2022). https://doi.org/10.22331/q-2022-01-03-615 We develop a framework to analyze the dynamics of a finite-dimensional quantum system $rm S$ in contact with a reservoir $rm R$. The full, interacting $rm SR$ dynamics is unitary. […]
Quantum 6, 614 (2022). https://doi.org/10.22331/q-2022-01-03-614 Let $p$ be an odd prime and let $r$ be the smallest generator of the multiplicative group $mathbb{Z}_p^ast$. We show that there exists a correlation of size $Theta(r^2)$ that self-tests […]
Quantum 6, 613 (2022). https://doi.org/10.22331/q-2022-01-03-613 Most quantum key distribution (QKD) protocols can be classified as either a discrete-variable (DV) protocol or continuous-variable (CV) protocol, based on how classical information is being encoded. We propose a […]
Quantum 5, 612 (2021). https://doi.org/10.22331/q-2021-12-28-612 We introduce the concepts of a symmetry-protected sign problem and symmetry-protected magic to study the complexity of symmetry-protected topological (SPT) phases of matter. In particular, we say a state has […]
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