2021/03/22 by Rodrigo A. Thomas, Christoffer Østfeldt, Christian Bærentsen +2
Physics and Astronomy · #Atomic and Subatomic Physics Research #Calibration #Cold Atom Physics and Bose-Einstein Condensates #Coupling (piping) #Faraday cage #Faraday effect #Laser #Magnetic field #Mechanical and Optical Resonators #Modulation (music) #Polarization (electrochemistry) #Quantum #Quantum optics #physics.atom-ph #physics.optics #quant-ph
paper · pdf · doi:10.1364/oe.425613
15 pages, 6 figures
arxiv created 2021/03/22 · openalex created_date 2021/03/29 · openalex publication_date 2021/06/09 · arxiv updated 2021/08/04 · openalex updated_date 2026/08/05
Calibrating the strength of the light-matter interaction is an important experimental task in quantum information and quantum state engineering protocols. The strength of the off-resonant light-matter interaction in multi-atom spin oscillators can be characterized by the readout rate Γ S . Here we introduce the method named Coherently Induced FAraday Rotation (CIFAR) for determining the readout rate. The method is suited for both continuous and pulsed readout of the spin oscillator, relying only on applying a known polarization modulation to the probe laser beam and detecting a known optical polarization component. Importantly, the method does not require changes to the optical and magnetic fields performing the state preparation and probing. The CIFAR signal is also independent of the probe beam photo-detection quantum efficiency, and allows direct extraction of other parameters of the interaction, such as the tensor coupling ζ S , and the damping rate γ S . We verify this method in the continuous wave regime, probing a strongly coupled spin oscillator prepared in a warm cesium atomic vapour.