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We report the creation of a wide range of quantum states with controllable degrees of entanglement and entropy using an optical two-qubit source based on spontaneous parametric down-conversion. The states are characterized using measures of entanglement and entropy determined from tomographically determined density matrices. The tangle-entropy plane is… (More)

Much like its classical counterpart, which aims at reconstructing three-dimensional images via a series of two-dimensional projections along various 'cuts', quantum tomography characterizes the complete quantum state of a particle or particles through a series of measurements in different bases. While the characterization of a classical object can involve a… (More)

- D. F. V. James, M. S. Gulley, +10 authors A. G. White
- QCQC
- 1998

We briefly review the development and theory of an experiment to investigate quantum computation with trapped calcium ions. The ion trap, laser and ion requirements are determined, and the parameters required for simple quantum logic operations are described. (LAUR 98-314)

- R. J. Hughes, D. F. V. James, +12 authors A. G. White
- 1998

Laboratory strongly supports academic freedom and a researcher's right to publish; therefore, the Laboratory as an institution does not endorse the viewpoint of a publication or guarantee its technical correctness. Abstract The development and theory of an experiment t o i n v estigate quantum computation with trapped calcium ions is described. The ion… (More)

- Daniel F V James
- CLEO/QELS: 2010 Laser Science to Photonic…
- 2010

I will give an introductory overview of current experimental techniques used to characterize the density matrix of a system and the quantum process describing a device, with emphasis on applications in quantum optics.

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