Excitonlike exchange in two-photon transitions of pairs of cold Rb Rydberg atoms

Abstract

We have observed exciton-like exchange in two photon microwave transitions between pairs of cold Rb Rydberg atoms, specifically transitions in which a ns 1/2 ns 1/2 pair undergoes the transition to the np 1/2 np 3/2 and np 3/2 np 1/2 states. This transition occurs due to the exciton like ns 1/2 npj ↔ npjns 1/2 exchange in the intermediate states, and the process can be thought of as a Forster resonant energy transfer between Floquet, or dressed states. In addition,the measurements provide clear evidence of the importance of the three dimensional nature of the dipole-dipole interaction.

Perturbed field ionization for improved state selectivity

“…First, tournament selection is used to select a pair. Two non-overlapping random sets of pulses are selected and the best pulse is selected from each (lines [17][18][19][20][21][22][23][24][25][26][27]. A child pulse is created by randomly selecting a parent gene at each locus, a technique referred to as uniform crossover.…”

“…Early features in the signal are associated with weakly bound electrons (high n) that ionize at low field while late features result from tightly bound electrons (low n) that ionize at high field. Such measurements have been used in a broad array of research including studies of quantum-classical correspondence with atomic electron wave packets [2][3][4], strong-field multiphoton interactions [5][6][7][8][9], quantum control using optical [10,11], terahertz [12,13], and microwave fields [14,15], ultracold plasmas [16,17], long-range dipolar interactions [18][19][20][21][22], and many more.…”