Schrodinger cats and their power for quantum information processing

Details Schrodinger cats and their power for quantum information processing Schrodinger cats and their power for quantum information processing

2003-12-24

arxiv.org/abs/quant-ph/0312194v1

J. Opt. B: Quantum Semiclass. Opt. 6, S828 (2004)

Physics

Quantum Physics

10 pages, 5 figures; Submitted to a Special Issue of J. Opt. B on "Fluctuations and Noise in Photonics and Quantum Optics" (He

Scientific paper

10.1088/1464-4266/6/8/032

We outline a toolbox comprised of passive optical elements, single photon detection and superpositions of coherent states (Schrodinger 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.

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