Adiabatic entanglement transport in Rydberg aggregates

Abstract

Abstract. We consider the interplay between excitonic and atomic motion in a regular, flexible chain of Rydberg atoms, extending our recent results on entanglement transport in Rydberg chains [Wüster et al., Phys. Rev. Lett 105 053004 (2010)]. In such a Rydberg chain, similar to molecular aggregates, an electronic excitation is delocalised due to long range dipole-dipole interactions among the atoms. The transport of an exciton that is initially trapped by a chain dislocation is strongly coupled to nuclear dynamics, forming a localised pulse of combined excitation and displacement. This pulse transfers entanglement between dislocated atoms adiabatically along the chain. Details about the interaction and the preparation of the initial state are discussed. We also present evidence that the quantum dynamics of this complex many-body problem can be accurately described by selected quantum-classical methods, which greatly simplify investigations of excitation transport in flexible chains.

Probing weak dipole-dipole interaction using phase-modulated nonlinear spectroscopy

“…3. First note that the peak posi- (25), (29), and (30)). The filled circles, stars and squares are from numerical simulations while the solid, dashed and dot-dashed lines from the Fourier transformation of analytical results (i.e., S…”

“…After inserting Λ ee , Λ ff , and Λ ef into S ee , S ff , and S ef in Eqs. (29) and (30) respectively, the second harmonic demodulated signals given by the demodulation of S ee , S ff , and S ef have a phase shift 3π 2 or π 2 for positive and negative dipole-dipole interaction respectively, from the first harmonic demodulated signal (i.e. phase demodulation of Eq.…”

Quantum Zeno Suppression of Intramolecular Forces

“…Similar decoherence effects in chemistry might arise for large bond lengths with atypically dense solvents. Our results also open up a research arena on the influence of tunable decoherence on energy transport and atomic motional dynamics in flexible Rydberg aggregates [14,15,[57][58][59] embedded in host atom clouds [67,68]. Additionally, we have shown how temporally localized decoherence pulses can be used as an incoherent means of population redistribution among BO surfaces.…”

Source of entangled atom pairs on demand using the Rydberg blockade

“…It will be important for the present work that C 3 > 0. The positive sign and the angular independence of D(|r n − r l |) can be achieved by choosing the polarization axis of the microwave along the inter-cloud axis [31], which can reduce the dynamics to just a single selected total angular momentum m j sublevel of the involved | p state. Working with s 1/2 and p 3/2 states ensures C 3 > 0 [41], as required.…”

“…pulse on the | s → | p transition, where p = | ν, l with l = 1, can excite the whole system to a collective state (exciton) with repulsive resonant dipole-dipole interactions between pairs of atoms from different clouds [23][24][25][26][27][28]. At separation d, this interaction will be much stronger than van-der Waals interactions, and accelerates the atoms away from one another [29][30][31]. In the repulsive exciton, the electronic state of the ejected atom pair is a Bell state [30,31], hence our setup directly implements the EPR scenario [12].…”