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 […]
Category: quantumjournal
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 […]
Quantum 5, 543 (2021). https://doi.org/10.22331/q-2021-09-16-543 We give new quantum algorithms for evaluating composed functions whose inputs may be shared between bottom-level gates. Let $f$ be an $m$-bit Boolean function and consider an $n$-bit function $F$ […]
Quantum 5, 542 (2021). https://doi.org/10.22331/q-2021-09-15-542 This paper studies the application of the Quantum Approximate Optimization Algorithm (QAOA) to spin-glass models with random multi-body couplings in the limit of a large number of spins. We show […]
Quantum 5, 541 (2021). https://doi.org/10.22331/q-2021-09-14-541 The mutual information is a measure of classical and quantum correlations of great interest in quantum information. It is also relevant in quantum many-body physics, by virtue of satisfying an […]
Quantum 5, 540 (2021). https://doi.org/10.22331/q-2021-09-13-540 We establish an analytical lower bound on the asymptotic secret key rate of continuous-variable quantum key distribution with an arbitrary modulation of coherent states. Previously, such bounds were only available […]
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