Quantum 5, 557 (2021). https://doi.org/10.22331/q-2021-10-05-557 Gate set tomography (GST) is a protocol for detailed, predictive characterization of logic operations (gates) on quantum computing processors. Early versions of GST emerged around 2012-13, and since then it […]
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 […]
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