‘Designer atoms’ for quantum metrology

C. F. Roos (), M. Chwalla, K. Kim, M. Riebe and R. Blatt
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C. F. Roos: Institut für Experimentalphysik, Universität Innsbruck
M. Chwalla: Institut für Experimentalphysik, Universität Innsbruck
K. Kim: Institut für Experimentalphysik, Universität Innsbruck
M. Riebe: Institut für Experimentalphysik, Universität Innsbruck
R. Blatt: Institut für Experimentalphysik, Universität Innsbruck

Nature, 2006, vol. 443, issue 7109, 316-319

Abstract: For good measure Quantum metrology exploits quantum theory to achieve precise measurement of the properties of a physical system. The use of entangled states can improve the signal-to-noise ratio and Roos et al. have exploited such states in a new way. They use a tailor-made 'superatom' of two entangled Ca+ ions to perform an ultraprecise spectroscopic measurement of the electric quadrupole moment, a quantity important for frequency standard applications. 'Designer atoms' like this should make precision spectroscopy applicable to many atoms not previously suited to the technique.

Date: 2006
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DOI: 10.1038/nature05101

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