Quantum 7, 927 (2023). https://doi.org/10.22331/q-2023-02-21-927 We classify the different ways in which matrix product states (MPSs) can stay invariant under the action of matrix product operator (MPO) symmetries. This is achieved through a local characterization […]
Quantum 7, 926 (2023). https://doi.org/10.22331/q-2023-02-16-926 Einstein-Podolsky-Rosen (EPR) steering is often (implicitly or explicitly) taken to be evidence for spooky action-at-a-distance. An alternative perspective on steering is that Alice has no causal influence on the physical […]
Quantum 7, 925 (2023). https://doi.org/10.22331/q-2023-02-16-925 NISQ devices have several physical limitations and unavoidable noisy quantum operations, and only small circuits can be executed on a quantum machine to get reliable results. This leads to the […]
Quantum 7, 924 (2023). https://doi.org/10.22331/q-2023-02-16-924 By encoding logical qubits into specific types of photonic graph states, one can realize quantum repeaters that enable fast entanglement distribution rates approaching classical communication. However, the generation of these […]
Quantum 7, 923 (2023). https://doi.org/10.22331/q-2023-02-16-923 Coupling to the environment typically suppresses quantum properties of physical systems via decoherence mechanisms. This is one of the main obstacles in practical implementations of quantum protocols. In this work […]
Quantum 7, 922 (2023). https://doi.org/10.22331/q-2023-02-16-922 Bell inequality tests where the detection efficiency is below a certain threshold $eta_{rm{crit}}$ can be simulated with local hidden-variable models. Here, we introduce a method to identify Bell tests requiring […]
Quantum 7, 921 (2023). https://doi.org/10.22331/q-2023-02-09-921 As the width and depth of quantum circuits implemented by state-of-the-art quantum processors rapidly increase, circuit analysis and assessment via classical simulation are becoming unfeasible. It is crucial, therefore, to […]
Quantum 7, 920 (2023). https://doi.org/10.22331/q-2023-02-09-920 A quantum internet aims at harnessing networked quantum technologies, namely by distributing bipartite entanglement between distant nodes. However, multipartite entanglement between the nodes may empower the quantum internet for additional […]
Quantum 7, 919 (2023). https://doi.org/10.22331/q-2023-02-09-919 The topology of classical networks is determined by physical links between nodes, and after a network request the links are used to establish the desired connections. Quantum networks offer the […]
Quantum 7, 918 (2023). https://doi.org/10.22331/q-2023-02-09-918 In a previous work [J. Chem. Phys. 155, 244111 (2021)], we found counterexamples to the fundamental Hohenberg-Kohn theorem from density-functional theory in finite-lattice systems represented by graphs. Here, we demonstrate […]
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