Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 4 June 2004:
Vol. 304. no. 5676, pp. 1476 - 1478
DOI: 10.1126/science.1097576
Prev | Table of Contents | Next

Reports

Toward Heisenberg-Limited Spectroscopy with Multiparticle Entangled States

D. Leibfried,* M. D. Barrett,{dagger} T. Schaetz, J. Britton, J. Chiaverini, W. M. Itano, J. D. Jost, C. Langer, D. J. Wineland

The precision in spectroscopy of any quantum system is fundamentally limited by the Heisenberg uncertainty relation for energy and time. For N systems, this limit requires that they be in a quantum-mechanically entangled state. We describe a scalable method of spectroscopy that can potentially take full advantage of entanglement to reach the Heisenberg limit and has the practical advantage that the spectroscopic information is transferred to states with optimal protection against readout noise. We demonstrate our method experimentally with three beryllium ions. The spectroscopic sensitivity attained is 1.45(2) times as high as that of a perfect experiment with three non-entangled particles.

National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.



{dagger} Present address: Department of Physics, University of Otago, Post Office Box 56, Dunedin, New Zealand.

* To whom correspondence should be addressed. E-mail: dil{at}boulder.nist.gov

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit.
J. Appel, P. J. Windpassinger, D. Oblak, U. B. Hoff, N. Kjaergaard, and E. S. Polzik (2009)
PNAS 106, 10960-10965
   Abstract »    Full Text »    PDF »
Magnetic Field Sensing Beyond the Standard Quantum Limit Using 10-Spin NOON States.
J. A. Jones, S. D. Karlen, J. Fitzsimons, A. Ardavan, S. C. Benjamin, G. A. D. Briggs, and J. J. L. Morton (2009)
Science 324, 1166-1168
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)