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Frontiers in Optics

Magnetic Resonance in an Atomic Vapor Excited by a Mechanical Resonator

Matthew Eardley, Y.-J. Wang, S. Knappe, John Moreland, Leo W. Hollberg, John E. Kitching

Published Jan 1, 2006• 2 citations
Publisher

Abstract

We demonstrate direct resonant interaction between a magnetic cantilever and Rubidium atomic spin. The coupled system may enable development of low-power, high performance sensors as well as cold atom manipulation and quantum control.
DOI
10.1364/ls.2006.lthb6

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We demonstrate a direct resonant interaction between the mechanical motion of a mesoscopic resonator and the spin degrees of freedom of a sample of neutral atoms in the gas phase. This coupling, mediated by a magnetic particle attached to the tip of the miniature mechanical resonator, excites a coherent precession of the atomic spins about a static magnetic field. The novel coupled atom-resonator system may enable development of low-power, high-performance sensors, and enhance research efforts connected with the manipulation of cold atoms, quantum control, and high-resolution microscopy.
Magnetic resonance in an ensemble of laser-cooled trapped Rb atoms is excited using a microcantilever with a magnetic tip. The cantilever is mounted on a multilayer chip designed to capture, cool, and magnetically transport cold atoms. The coupling is observed by measuring the loss from a magnetic trap as the oscillating cantilever induces Zeeman-state transitions in the atoms. Interfacing cold atoms with mechanical devices could enable probing and manipulating atomic spins with nanometer spatial resolution and single-spin sensitivity, leading to new capabilities in quantum computation, quantum simulation, and precision sensing.
High-sensitivity sensors play a critical role in fundamental physics research, space magnetic field detection, geological monitoring, and biomedical applications. Atomic sensors, based on quantum mechanics principles, such as atomic magnetometers, atomic clocks, and atomic gyroscopes, etc. have emerged as pivotal technical equipment for precision measurements due to their exceptional sensitivity, low power consumption, and long-term stability. The atomic vapor cell, serving as the core component, facilitates quantum state manipulation via the Zeeman effect. Miniaturization and integration of these cells have not only advanced the development of portable atomic magnetometers but also provided a foundation for breakthroughs in chip-scale atomic clocks and enhanced navigation accuracy of atomic gyroscopes. The research progresses of chip-scale atomic vapor cells in recent years are reviewed. The advancements in alkali metal introduction methods, anti-relaxation surface coatings, and micro-nano fabrication techniques have enabled the miniaturization of atomic vapor cells while preserving high performance, creating new opportunities for the deployment of quantum sensing technologies across diverse fields. Looking ahead, multifunctional integration and material innovations in atomic vapor cells are expected to further broaden their applications in time-frequency standards, inertial navigation systems, and weak magnetic field measurements.
We theoretically study the coupling of Bose-Einstein condensed atoms to the mechanical oscillations of a nanoscale cantilever with a magnetic tip. This is an experimentally viable hybrid quantum system which allows one to explore the interface of quantum optics and condensed matter physics. We propose an experiment where easily detectable atomic spin flips are induced by the cantilever motion. This can be used to probe thermal oscillations of the cantilever with the atoms. At low cantilever temperatures, as realized in recent experiments, the backaction of the atoms onto the cantilever is significant and the system represents a mechanical analog of cavity quantum electrodynamics. With high but realistic cantilever quality factors, the strong coupling regime can be reached, either with single atoms or collectively with Bose-Einstein condensates. We discuss an implementation on an atom chip.