4 code implementations • 30 Jul 2019 • Robin Harper, Steven T. Flammia, Joel J. Wallman
We show how to construct a quantum noise correlation matrix allowing the easy visualization of correlations between all pairs of qubits, enabling the discovery of long-range two-qubit correlations in the 14 qubit device that had not previously been detected.
Quantum Physics
no code implementations • 12 Oct 2018 • Junan Lin, Brandon Buonacorsi, Raymond Laflamme, Joel J. Wallman
We discuss the effects of a gauge freedom in representing quantum information processing devices, and its implications for characterizing these devices.
Quantum Physics
no code implementations • 12 Mar 2012 • Joel J. Wallman, Stephen D. Bartlett
We seek to determine what other sets of quantum states and measurements for a qubit can be non-negative in a quasiprobability representation, and to identify nontrivial unitary groups that permute the states in such a set.
Quantum Physics
