Non-linear amplification of small spin precession using long range dipolar interactions

Abstract

In measurements of small signals using spin precession the precession angle usually grows linearly in time. We show that non-linear interactions between particles can lead to an exponentially growing spin precession angle, resulting in an amplification of small signals and raising them above the noise level of a detection system. We demonstrate amplification by a factor of greater than 8 of a spin precession signal due to a small magnetic field gradient in a spherical cell filled with hyperpolarized liquid ${}^{129}$Xe. This technique can improve the sensitivity in many measurements that are limited by the noise of the detection system, rather then the fundamental spin-projection noise.

4 pages, 4 figures

References in corpus (6)

• Quantum computation with trapped polar molecules
• Tuning the dipolar interaction in quantum gases
• A new limit on the permanent electric dipole moment of ^{199}Hg
• Limit on Lorentz and CPT Violation of the Neutron Using a Two-Species Noble-Gas Maser
• Stability of atomic clocks based on entangled atoms
• Can a quantum nondemolition measurement improve the sensitivity of an atomic magnetometer?

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