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Schreodinger cats and their power for quantum information processing

Gilchrist, A.; Nemoto, Kae; Munro, William J.; Ralph, T.C.; Glancy, S.; Braunstein, Samuel L:.; Milburn, G.J.

HPL-2003-240

Keyword(s): quantum information; Schreodinger cat states; quantum metrology; coherent quantum; quantum gates; conditional measurements

Abstract: We outline a toolbox comprised of passive optical elements, single photon detection and superpositions of coherent states (Schreodinger cat states). Such a toolbox is a powerful collection of primitives for quantum information processing tasks. We illustrate its use by outlining a proposal for universal quantum computation. We utilize this toolbox for quantum metrology applications, for instance weak force measurements and precise phase estimation. We show in both these cases that a sensitivity at the Heisenberg limit is achievable. Notes: Alexei Glichrist, T.C. Ralph and Gerard Milburn, Centre for Quantum Computer Technology and Department of Physics, University of Queensland, QLD 4072, Brisbane, Australia Kae Nemoto, National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan Scott Glancy, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA Samuel L. Braunstein, Computer Science, York University, York YO10 5DD, UK

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