Dispersive probing of driven pseudo-spin dynamics in a gradient field

Abstract

We have studied the coherent evolution of ultracold atomic rubidium clouds subjected to a microwave field driving Rabi oscillations between the stretched states of the F=1 and F=2 hyperfine levels. A phase winding of the two-level system pseudo-spin vector is encountered for elongated samples of atoms exposed to an axial magnetic field gradient and can be observed directly in state-selective absorption imaging. When dispersively recording the sample-integrated spin population during the Rabi drive, we observe a damped oscillation directly related to the magnetic field gradient, which we quantify using a simple dephasing model. By analyzing such dispersively acquired data from millimeter sized atomic samples, we demonstrate that field gradients can be determined with an accuracy of $\sim 25$ nT/mm. The dispersive probing of inhomogeneously broadened Rabi oscillations in prolate samples opens up a path to gradiometry with bandwidths in the kilohertz domain.

11 pages, 9 figures, 1 video link

References in corpus (13)

• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• Analytically solvable driven time-dependent two-level quantum systems
• Observation of Anomalous Spin Segregation in a Trapped Fermi Gas
• Universal spin dynamics in two-dimensional Fermi gases
• Imaging of microwave fields using ultracold atoms
• Non-Destructive Probing of Rabi Oscillations on the Cesium Clock Transition near the Standard Quantum Limit
• Simple microwave field imaging technique using hot atomic vapor cells
• Phase Winding a Two-Component BEC in an Elongated Trap: Experimental Observation of Moving Magnetic Orders and Dark-bright Solitons
• Heterodyne non-demolition measurements on cold atomic samples: towards the preparation of non-classical states for atom interferometry
• Faraday spectroscopy of atoms confined in a dark optical trap
• Spin waves and Collisional Frequency Shifts of a Trapped-Atom Clock
• Inhomogeneous Light Shift Effects on Atomic Quantum State Evolution in Non-Destructive Measurements
• Quantum galvanometer by interfacing a vibrating nanowire and cold atoms

Cited by in corpus (10)

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• Observation of Pauli blocking in light scattering from quantum degenerate fermions
• Spatially-resolved control of fictitious magnetic fields in a cold atomic ensemble
• Precision measurements with cold atoms and trapped ions
• Dispersive optical detection of magnetic Feshbach resonances in ultracold gases
• Low-cost Wireless Condition Monitoring for an Ultracold Atom Machine
• Dispersive detection of atomic ensembles in the presence of strong lensing
• Deterministic quantum state transfer of atoms in a random magnetic field