Evan M. Fortunato,1 Lorenza Viola,2, Marco A. Pravia,1 Emanuel Knill,2 Raymond Laflamme,3 Timothy F. Havel,1 and David G. Cory1 1 Department of Nuclear Engineering, Massachusetts Institute ofâ€¦ (More)

In this Letter, we present an experimental benchmark of operational control methods in quantum information processors extended up to 12 qubits. We implement universal control of this large Hilbertâ€¦ (More)

A quantum computer is a machine which can operate in parallel on all its possible inputs at once, and can be programmed much like a conventional digital computer. It is based on the fact that theâ€¦ (More)

This paper describes an intuitive geometric model for coupled twostate quantum systems (qubits), which is formulated using geometric (aka Clifford) algebra. It begins by showing how Euclidean spinorsâ€¦ (More)

In this paper we study the statistical geometry of ensembles of poly (L-alanine) conformations computed by several different distance geometry algorithms. Since basic theory only permits us toâ€¦ (More)

Distance geometry is the mathematical basis for a geometric theory of molecular conformation.1 This theory plays a role in conformational analysis analogous to that played in statistical mechanics byâ€¦ (More)

Errors in the control of quantum systems may be classified as unitary, decoherent and incoherent. Unitary errors are systematic, and result in a density matrix that differs from the desired one by aâ€¦ (More)