Quantum 6, 657 (2022). https://doi.org/10.22331/q-2022-02-21-657 We propose a method to reliably and efficiently extract the fidelity of many-qubit quantum circuits composed of continuously parametrized two-qubit gates called matchgates. This method, which we call $textit{matchgate benchmarking}$, […]
Quantum 6, 656 (2022). https://doi.org/10.22331/q-2022-02-21-656 In this work, we characterize the amount of steerability present in quantum theory by connecting the maximal violation of a steering inequality to an inclusion problem of free spectrahedra. In […]
Quantum 6, 655 (2022). https://doi.org/10.22331/q-2022-02-16-655 Information-theoretic ideas have provided numerous insights in the progress of fundamental physics, especially in our pursuit of quantum gravity. In particular, the holographic entanglement entropy is a very useful tool […]
Quantum 6, 654 (2022). https://doi.org/10.22331/q-2022-02-16-654 Quantum systems generally exhibit different kinds of correlations. In order to compare them on equal footing, one uses the so-called distance-based approach where different types of correlations are captured by […]
Quantum 6, 653 (2022). https://doi.org/10.22331/q-2022-02-16-653 A multiple access channel describes a situation in which multiple senders are trying to forward messages to a single receiver using some physical medium. In this paper we consider scenarios […]
Quantum 6, 652 (2022). https://doi.org/10.22331/q-2022-02-15-652 The $textit{stabilizer rank}$ of a quantum state $psi$ is the minimal $r$ such that $left| psi right rangle = sum_{j=1}^r c_j left|varphi_j rightrangle$ for $c_j in mathbb{C}$ and stabilizer states […]
Quantum 6, 651 (2022). https://doi.org/10.22331/q-2022-02-15-651 Steering criteria are conditions whose violation excludes the possibility of describing the observed measurement statistics with local hidden state (LHS) models. When the available data do not allow to exclude […]
A couple months ago, friends and business contacts started asking me for a crash course on my professional research studying virtual environments. Their interest reflects an explosion—which you’ve probably noticed—of noise and hype surrounding something […]
Quantum 6, 650 (2022). https://doi.org/10.22331/q-2022-02-10-650 The thermal equilibrium properties of physical systems can be described using Gibbs states. It is therefore of great interest to know when such states allow for an easy description. In […]
Quantum 6, 649 (2022). https://doi.org/10.22331/q-2022-02-10-649 The characterization of open quantum systems is a central and recurring problem for the development of quantum technologies. For time-independent systems, an (often unique) steady state describes the average physics […]
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