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Summary: Can a Quantum Nondemolition Measurement Improve the Sensitivity
of an Atomic Magnetometer?
M. Auzinsh,1
D. Budker,2,3,* D. F. Kimball,2
S. M. Rochester,2
J. E. Stalnaker,2
A. O. Sushkov,2
and V.V. Yashchuk4
1
Department of Physics, University of Latvia, 19 Rainis blvd, Riga, LV-1586, Latvia
2
Department of Physics, University of California, Berkeley, California 94720-7300, USA
3
Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley California 94720, USA
4
Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley California 94720, USA
(Received 25 March 2004; published 19 October 2004)
We consider the limitations due to noise (e.g., quantum projection noise and photon shot-noise) on the
sensitivity of an idealized atomic magnetometer that utilizes spin squeezing induced by a continuous
quantum nondemolition measurement. Such a magnetometer measures spin precession of N atomic
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