Abstract
We explore experimentally quantum nondemolition measurements of atomic spin in a hot potassium vapor in the presence of spin-exchange relaxation. We demonstrate a new technique for backaction evasion by stroboscopic modulation of the probe light. With this technique we study spin noise as a function of polarization for atoms with spin greater than 1/2 and obtain good agreement with a simple theoretical model. We point that, in a system with fast spin exchange, where the spin-relaxation rate is changing with time, it is possible to improve the long-term sensitivity of atomic magnetometry by using quantum nondemolition measurements.
Original language | English (US) |
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Article number | 143601 |
Journal | Physical review letters |
Volume | 106 |
Issue number | 14 |
DOIs | |
State | Published - Apr 5 2011 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy