Quantum Control of the Hyperfine Spin of a Cs Atom Ensemble

TL;DR

This paper demonstrates advanced quantum control over the hyperfine spin of cesium atoms, enabling precise state manipulation and the generation of squeezed states, with potential applications in quantum information and precision measurement.

Contribution

It introduces a method combining magnetic fields and light shifts for near-optimal control of large atomic spins, including robust adiabatic schemes for state preparation.

Findings

Achieved high-yield state mapping (0.8-0.9)

Produced squeezed states via adiabatic control

Enabled universal control of atomic ground states

Abstract

We demonstrate quantum control of a large spin-angular momentum associated with the F=3 hyperfine ground state of 133Cs. A combination of time dependent magnetic fields and a static tensor light shift is used to implement near-optimal controls and map a fiducial state to a broad range of target states, with yields in the range 0.8-0.9. Squeezed states are produced also by an adiabatic scheme that is more robust against errors. Universal control facilitates the encoding and manipulation of qubits and qudits in atomic ground states, and may lead to improvement of some precision measurements.