Linear and non-linear coherent coupling in a Bell-Bloom magnetometer
arXiv:1903.05605 · doi:10.1103/PhysRevA.98.061401
Abstract
Spin-exchange collisions in hot vapours are generally regarded as a decoherence mechanism. In contrast, we show that linear and non-linear spin-exchange coupling can lead to the generation of atomic coherence in a Bell-Bloom magnetometer. In particular, we theoretically and experimentally demonstrate that non-linear spin exchange coupling, acting in an analogous way to a wave-mixing mechanism, can create new modes of coherent excitation which inherit the magnetic properties of the natural Larmor coherence. The generated coherences further couple via linear spin-exchange interaction, leading to an increase of the natural coherence lifetime of the system. Notably, the measurements are performed in a low-density caesium vapour and for non-zero magnetic field, outside the standard conditions for collisional coherence transfer. The strategies discussed are important for the development of spin-exchange coupling into a resource for an improved measurement platform based on room-temperature alkali-metal vapours.
References in corpus (10)
- Nuclear spin gyroscope based on an atomic co-magnetometer
- Quantum noise limited and entanglement-assisted magnetometry
- A new test of local Lorentz invariance using Ne-Rb-K comagnetometer
- How do you know if you ran through a wall?
- Observation of atom pairs in spontaneous four wave mixing of two colliding Bose-Einstein Condensates
- Atomic magnetic resonance induced by amplitude-, frequency-, or polarization-modulated light
- Nonlinear magneto-optical rotation with modulated light in tilted magnetic fields
- Parametric Excitation and Squeezing in a Many-Body Spin System
- Coherent coupling of alkali atoms by random collisions
- Nonlinear Elimination of Spin-Exchange Relaxation of High Magnetic Moments