All-optical measurement of magnetic fields for quantum gas experiments

Abstract

We present an all-optical method to measure and compensate for residual magnetic fields present in a cloud of ultracold atoms trapped in an optical dipole trap. Our approach leverages the increased loss from the trapped atomic sample through electromagnetically induced absorption. Modulating the excitation laser provides coherent sidebands, resulting in Λ-type pump-probe scheme. Scanning an additional magnetic offset field leads to pairs of sub-natural linewidth resonances, whose positions encode the magnetic field in all three spatial directions. Our measurement scheme is readily implemented in a typical quantum gas experiments and has no particular hardware requirements.

References in corpus (5)

• Atom Interferometers
• Detecting multiparticle entanglement of Dicke states
• Quantum Sensing in Tweezer Arrays: Optical Magnetometry on an Individual-Atom Sensor Grid
• Magneto-optical resonance of electromagnetically induced absorption with high contrast and narrow width in a vapour cell with buffer gas
• Level-crossing resonances on open atomic transitions in a buffered Cs vapor cell: Linewidth narrowing, high contrast and applications to atomic magnetometry