Quantum 5, 553 (2021). https://doi.org/10.22331/q-2021-09-28-553 Topological protection is employed in fault-tolerant error correction and in developing quantum algorithms with topological qubits. But, topological protection $textit{intrinsic to models being simulated}$, also robustly protects calculations, even on […]
Quantum 5, 552 (2021). https://doi.org/10.22331/q-2021-09-28-552 Given a Bell inequality, if its maximal quantum violation can be achieved only by a single set of measurements for each party or a single quantum state, up to local […]
Quantum 5, 551 (2021). https://doi.org/10.22331/q-2021-09-28-551 Multiple observers who independently harvest nonclassical correlations from a single physical system share the system’s ability to enable quantum correlations. We show that any number of independent observers can share […]
Quantum 5, 550 (2021). https://doi.org/10.22331/q-2021-09-28-550 Constraint programming (CP) is a paradigm used to model and solve constraint satisfaction and combinatorial optimization problems. In CP, problems are modeled with constraints that describe acceptable solutions and solved […]
Quantum 5, 549 (2021). https://doi.org/10.22331/q-2021-09-23-549 Motivated by estimation of quantum noise models, we study the problem of learning a Pauli channel, or more generally the Pauli error rates of an arbitrary channel. By employing a […]
Quantum 5, 548 (2021). https://doi.org/10.22331/q-2021-09-21-548 Even with the recent rapid developments in quantum hardware, noise remains the biggest challenge for the practical applications of any near-term quantum devices. Full quantum error correction cannot be implemented […]
Quantum 5, 547 (2021). https://doi.org/10.22331/q-2021-09-21-547 The laws of thermodynamics are usually formulated under the assumption of infinitely large environments. While this idealization facilitates theoretical treatments, real physical systems are always finite and their interaction range […]
Quantum 5, 546 (2021). https://doi.org/10.22331/q-2021-09-21-546 The study of low-dimensional quantum systems has proven to be a particularly fertile field for discovering novel types of quantum matter. When studied numerically, low-energy states of low-dimensional quantum systems […]
Quantum 5, 545 (2021). https://doi.org/10.22331/q-2021-09-21-545 The main purpose of this study is to introduce a semi-classical model describing betting scenarios in which, at variance with conventional approaches, the payoff of the gambler is encoded into […]
Quantum 5, 544 (2021). https://doi.org/10.22331/q-2021-09-16-544 Self-testing is a method to characterise an arbitrary quantum system based only on its classical input-output correlations, and plays an important role in device-independent quantum information processing as well as […]
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