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Quantum technologies

Dieter Meschede's research group
Home Few-atom quantum systems Vibrational states
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Vibrational manipulation

Vibrational manipulation by microwave

Operations targeting the oscillation of an atom in a trap are normally carried out by Raman lasers, using a two-photon process and taking the momentum difference between two photons to supply the missing momentum. This is a successful technique for cooling atoms into the ground state to allow demanding coherence experiments. Our state-dependent lattice opens a second way to vibrational manipulation: A slight state-dependent shift offsets the traps for the two spin states, causing a normal spin-flip operation to shift the atom in space. Correctly tuned, this shift supplies the necessary momentum, allowing sideband transitions using a single-photon microwave transition. The strength of this technique is the reliable ground state cooling, while also allowing high sidebands to be driven. Using sideband transitions also allows us to characterize the vibrational state distribution of an atom to monitor transitions induced by transport. Read our publication.

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Fig. 4: Shifting the potentials gives a displacement to a normal spin flip; this allows us to combine a flip with a change in vibrational quantum number.