Anomalous excitation enhancement with Rydberg-dressed atoms

Abstract

We develop the research achievement of recent work [M. Gärttner, et.al., Phys. Rev. Letts. 113, 233002 (2014)], in which an anomalous excitation enhancement is observed in a three-level Rydberg-atom ensemble with many-body coherence. In our novel theoretical analysis, this effect is ascribed to the existence of a quasi-dark state as well as its avoided crossings to nearby Rydbergdressed states. Moreover, we show that with an appropriate control of the optical detuning to the intermediate state, the enhancement can evoke a direct facilitation to atom-light coupling that even breaks through the conventional √ N limit of strong-blockaded ensembles. As a consequence, the intensity of the probe laser for intermediate transition can be reduced considerably, increasing the feasibility of experiments with Rydberg-dressed atoms.

Switchable dynamic Rydberg-dressed excitation via a cascaded double electromagnetically induced transparency

“…In addition, we study the transient response in the system and describe the role of Rydberg blockade in the reduction of response time, accompanied by an enhanced dressing probability due to the collective feature on darkstate resonance by interacting atoms [33]. The effect is improved with the number of atoms.…”

Fast spin squeezing by distance-selective long-range interactions with Rydberg molecule dressing

“…The long lifetime and strong interaction emerging between atoms excited to Rydberg states offer an effective way for the implementation of quantum computation protocols [1][2][3][4][5][6][7][8][9][10], and many-body quantum simulation [11][12][13][14][15][16][17][18][19][20]. One approach to utilize the Rydberg interaction is through the Rydberg dressing [21][22][23][24][25][26][27][28][29][30][31][32], where by using an off-resonant laser coupling to a Rydberg state, the ground state atoms are prepared in a dressed eigenstate with a small fraction of Rydberg excitations. As direct Rydberg excitation is avoided, the dressed interaction -although weakened in strength -comes in principle with the benefit of prolonged coherence times.…”

Selective Rydberg pumping via strong dipole blockade

“…Using a continuous laser field coupling the ground state to the Rydberg state can form two dressed states, these Rydberg-dressed states have relative long lifetimes as compared to the bare Rydberg state, while maintains a certain strength of the RRI to induce the blockade effect [22,23]. Therefore the Rydberg dressing technique provides a tunable interaction for quantum control and quantum computing [24][25][26][27][28][29][30][31][32][33]. It should be emphasized that at the end of each Rydberg-dressed scheme, an additional operation that adiabatically transferring the Rydberg-dressed state back to the ground state is necessary to avoid further decoherence.…”