Quantum 5, 556 (2021). https://doi.org/10.22331/q-2021-09-29-556 We present a novel mapping for studying 2D many-body quantum systems by solving an effective, one-dimensional long-range model in place of the original two-dimensional short-range one. In particular, we address […]
Quantum 5, 555 (2021). https://doi.org/10.22331/q-2021-09-28-555 In a quantum measurement process, classical information about the measured system spreads throughout the environment. Meanwhile, quantum information about the system becomes inaccessible to local observers. Here we prove a […]
Quantum 5, 554 (2021). https://doi.org/10.22331/q-2021-09-28-554 We consider a model of quantum computation using qubits where it is possible to measure whether a given pair are in a singlet (total spin $0$) or triplet (total spin […]
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 […]
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