Quantum 5, 504 (2021). https://doi.org/10.22331/q-2021-07-15-504 We introduce $textit{Partially Coherent Direct Sum}$ (PCDS) quantum channels, as a generalization of the already known $textit{Direct Sum}$ quantum channels. We derive necessary and sufficient conditions to identify the subset […]
Quantum 5, 503 (2021). https://doi.org/10.22331/q-2021-07-13-503 We argue that the quantum-theoretical structures studied in several recent lines of research cannot be adequately described within the standard framework of quantum circuits. This is in particular the case […]
Quantum 5, 502 (2021). https://doi.org/10.22331/q-2021-07-13-502 Identifying computational tasks suitable for (future) quantum computers is an active field of research. Here we explore utilizing quantum computers for the purpose of solving differential equations. We consider two […]
Quantum 5, 501 (2021). https://doi.org/10.22331/q-2021-07-13-501 Topological materials have potential applications for quantum technologies. Non-interacting topological materials, such as e.g., topological insulators and superconductors, are classified by means of fundamental symmetry classes. It is instead only […]
Quantum 5, 500 (2021). https://doi.org/10.22331/q-2021-07-13-500 Energy storage is a basic physical process with many applications. When considering this task at the quantum scale, it becomes important to optimise the non-equilibrium dynamics of energy transfer to […]
Quantum 5, 499 (2021). https://doi.org/10.22331/q-2021-07-13-499 Activation of Bell nonlocality refers to the phenomenon that some entangled mixed states that admit a local hidden variable model in the standard Bell scenario nevertheless reveal their nonlocal nature […]
Quantum 5, 498 (2021). https://doi.org/10.22331/q-2021-07-08-498 The Wigner’s friend paradox concerns one of the most puzzling problems of quantum mechanics: the consistent description of multiple nested observers. Recently, a variation of Wigner’s gedankenexperiment, introduced by Frauchiger […]
Quantum 5, 497 (2021). https://doi.org/10.22331/q-2021-07-06-497 This paper presents “Stim”, a fast simulator for quantum stabilizer circuits. The paper explains how Stim works and compares it to existing tools. With no foreknowledge, Stim can analyze a […]
Quantum 5, 496 (2021). https://doi.org/10.22331/q-2021-07-05-496 We study supervised learning algorithms in which a quantum device is used to perform a computational subroutine – either for prediction via probability estimation, or to compute a kernel via […]
Quantum 5, 495 (2021). https://doi.org/10.22331/q-2021-07-05-495 We consider simulating quantum systems on digital quantum computers. We show that the performance of quantum simulation can be improved by simultaneously exploiting commutativity of the target Hamiltonian, sparsity of […]
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