Long-lived collective Rydberg excitations, published in Quantum

By modulating an ac-Stark lattice we extended the lifetime of collective Rydberg excitations in atomic gas, a key ingredient for photon–photon interactions. Read the paper in Quantum 8, 1431.

Two interfering laser beams create an off-resonant ac-Stark lattice that counteracts thermal dephasing of the spin wave, extending the lifetime of the excitation by an order of magnitude.