Population trapping in a pair of periodically driven Rydberg atoms

Abstract

We study the population trapping extensively in a periodically driven Rydberg dimer. The periodic modulation of the atom-light detuning effectively suppresses the Rabi couplings and, together with Rydberg-Rydberg interactions, leads to the state-dependent population trapping. We identify a simple, yet a general scheme to determine population trapping regions using driving induced resonances, the Floquet spectrum, and the inverse participation ratio. Contrary to the single atom case, we show that the population trapping in the two-atom setup may not necessarily be associated with level crossings in the Floquet spectrum. Further, we discuss under what criteria population trapping can be related to dynamical stabilization, taking specific initial states which include both product and the maximally entangled Bell states. The behavior of the entangled states is further characterized by the bipartite entanglement entropy.

Resilient quantum gates on periodically driven Rydberg atoms

“…For coherent control of quantum dynamics, a wealth of quantum phenomena can be found in periodically driven Rydberg atoms [27][28][29][30][31]. In this work, with a periodical amplitude-modulated field on a control atom, we propose to implement a controlled-Z (CZ) gate.…”