Projects per year
Abstract
We describe a dispersive Faraday optical probe of atomic spin which performs a weak measurement of spin projection of a quantum gas continuously for more than one second. To date, focusing bright far-off-resonance probes onto quantum gases has proved invasive due to strong scalar and vector light shifts exerting dipole and Stern-Gerlach forces. We show that tuning the probe near the magic-zero wavelength at 790 nm between the fine-structure doublet of Rb87 cancels the scalar light shift, and careful control of polarization eliminates the vector light shift. Faraday rotations due to each fine-structure line reinforce at this wavelength, enhancing the signal-to-noise ratio for a fixed rate of probe-induced decoherence. Using this minimally invasive spin probe, we perform microscale atomic magnetometry at high temporal resolution. Spectrogram analysis of the Larmor precession signal of a single spinor Bose-Einstein condensate measures a time-varying magnetic field strength with 1 μG accuracy every 5 ms; or, equivalently, makes more than 200 successive measurements each at 10pT/Hz sensitivity.
Original language | English |
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Article number | 063402 |
Number of pages | 11 |
Journal | Physical Review A |
Volume | 96 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Dec 2017 |
Projects
- 2 Finished
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Foundation technology for quantum measurement, sensing and computing.
Helmerson, K., Anderson, R., Biercuk, M., Hollenberg, L., Luiten, A., Scholten, R., Simpson, D., Turner, L. & Starr, R.
Australian Research Council (ARC)
1/10/13 → 1/10/13
Project: Research
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Quantum magnetometry on the microscale
Australian Research Council (ARC), Monash University
4/01/10 → 15/04/13
Project: Research