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N = 19 rubidium atoms are loaded with holographic optical tweezers in a zig-zag chain and entangled through collective Rabi oscillation to Rydberg state. Resulting coherent dynamics manifests quantum simulation of 1D quantum-Ising model with controlled frustrations.
We report a new method to load N=20 single-atoms near-deterministically (90% for 3-by-3 square and 80% for N=19 ring lattice) in 2D lattices, using dynamic holographic optical tweezers implemented with a 2D liquid-crystal spatial-light modulator.
We demonstrate trapping and dynamic reconfiguration of rubidium single-atom arrays in 3D holographic potential traps formed by a phase-only spatial light modulator (SLM). Atom loss caused by the limited response time of SLM liquid crystals is resolved by a simple, alternative way of phase-patterning.
Complete population inversion of two-level atoms in a magneto-optical trap is demonstrated by off-resonant two laser pulses shaped from a single ultrafast laser pulse. The observed phenomenon is explained in the context of femto-second laser version of Stark-chirped rapid adiabatic passage.
We show that the 24 energy levels involved in the D1 transition of atomic Rb85 are reduced to independent 12 two-level systems of a single Rabi frequency by Morris-Shore transformation. Experiment performed with ultrafast laser interacting with cold atoms in a MOT confirms the prediction.
Spectro-spatial coherent control methods are reported demonstrating optimized resonant two-photon transitions of rubidium atomic vapor by counter-propagating ultrashort pulse pairs. By properly programming the spectral sign changes across resonance frequencies, unlike non-resonant two-photon transitions, the resonant two-photon transitions probabilities could be enhanced, experiment finds.
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