Quantum limit of optical magnetometry in the presence of ac-Stark shifts

Details Quantum limit of optical magnetometry in the presence of ac-Stark shifts Quantum limit of optical magnetometry in the presence of ac-Stark shifts

2000-01-20

arxiv.org/abs/quant-ph/0001072v1

Physics

Quantum Physics

11 pages, 4 figures

Scientific paper

10.1103/PhysRevA.62.013808

We analyze systematic (classical) and fundamental (quantum) limitations of the sensitivity of optical magnetometers resulting from ac-Stark shifts. We show that in contrast to absorption-based techniques, the signal reduction associated with classical broadening can be compensated in magnetometers based on phase measurements using electromagnetically induced transparency (EIT). However due to ac-Stark associated quantum noise the signal-to-noise ratio of EIT-based magnetometers attains a maximum value at a certain laser intensity. This value is independent on the quantum statistics of the light and defines a standard quantum limit of sensitivity. We demonstrate that an EIT-based optical magnetometer in Faraday configuration is the best candidate to achieve the highest sensitivity of magnetic field detection and give a detailed analysis of such a device.

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