Tailoring Bose-Einstein-condensate environments for a Rydberg impurity

Rammohan, S.; Chauhan, A. K.; Nath, Rejish; Eisfeld, Alexander; Wüster, Sebastian

doi:10.1103/physreva.103.063307

Cited by 11 publications

(4 citation statements)

References 74 publications

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“…They explained how to examine ionization collision using this tracking technique. Theoretically, Rammohan et al explained the decoherence caused by phonons in the superposition of two separate Rydberg states [19]. The Rydberg phonon coupling coefficient has been discovered.…”

Section: Introductionmentioning

confidence: 99%

Collective Excitations of Bose–Einstein Condensate in a Rydberg Atom

Banerjee,

Majumder

2024

J Low Temp Phys

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In this work, we investigated a Bose-Einstein condensate (BEC) inside a Rydberg atom. We first observed the system's density profile using the Gross-Pitaevskii equation, and then we used the Bogoliubov theory to examine the collective excitation spectra. We have also extended our study by taking into account a hybrid of two BEC species. Again, for this new system, the density profile and the collective excitation are investigated in a similar manner. The results of the BEC for one species reveal that the Rydberg atom can trap the BEC and that the excitation curve moves upward with increasing Rydberg atom interaction. We have seen roton minima for two species of BEC, and the depth of the minima shifts with the Rydberg interaction.

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Section: Introductionmentioning

confidence: 99%

Collective Excitations of Bose–Einstein Condensate in a Rydberg Atom

Banerjee,

Majumder

2024

J Low Temp Phys

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“…For example, the Dicke quantum phase transition (QPT) in the cavity-BEC system [56][57][58][59][60][61][62][63][64][65][66][67] has been experimentally demonstrated and extensively studied theoretically. Furthermore, an impurity-doped BEC [68][69][70][71][72][73][74][75][76] builds a micro-macro hybrid quantum systems where the microscopic impurities meet such a macroscopic matter as BEC. Such a hybrid systems can combine complementary functionalities of micro-macro devices to obtain multitasking capabilities which is crucial for implementing quantum information processing [77][78][79].…”

Section: Introductionmentioning

confidence: 99%

Einstein-Podolsky-Rosen steering of quantum phases in a cavity Bose-Einstein condensate with a single impurity

Jia¹,

Li²,

Jiao³

et al. 2022

Preprint

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We study Einstein-Podolsky-Rosen (EPR) steering properties of quantum phases in the generalized Dicke model (GDM) generated by a cavity Bose-Einstein condensate (BEC) doped with a single impurity. It is shown that the normal and superradiant phases of the GDM exhibit much rich EPR steerability. In the normal phase, there exist one-way EPR steering from the cavity field (condensed atoms) to condensed atoms (the cavity field ). In the superradiant phase, there is either one-way or two-way EPR steering for the cavity field and condensed atoms. It is found that the single impurity can act as a single-atom switch of the EPR steering to control the steering direction of one-way EPR steering and the transition between one-way and two-way EPR steering through switching on or off the impurity-BEC coupling. It is proved that the EPR steering parameters can witness the quantum phase transition (QPT) occurrence through the sudden change of the EPR steering parameters at the critical point of the QPT. Our results open a new way to manipulate macroscopic EPR steering and witness the QPT between the normal phase and the superradiant phase in the GDM through a microscopic impurity atom.

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“…The Rydberg electron affects the BEC by imprinting a phase on its mean field wave function at short times, which evolves into density waves at later times. It has been suggested to use these features for tracking the motion, detecting the position and deducing or decohering the quantum state of isolated Rydberg impurities [14][15][16][17][18]. However, for these proposals a detailed understanding of the joint BEC and Rydberg impurity dynamics is required.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of atoms within atoms

et al. 2022

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Recent experiments with Bose-Einstein condensates have entered a regime in which thousands of ground-state condensate atoms fill the Rydberg-electron orbit. After the excitation of a single atom into a highly excited Rydberg state, scattering off the Rydberg electron sets ground-state atoms into motion, such that one can study the quantum-many-body dynamics of atoms moving within the Rydberg atom. Here we study this many-body dynamics using Gross-Pitaevskii and truncated Wigner theory. Our simulations focus in particular on the scenario of multiple sequential Rydberg excitations on the same Rubidium condensate which has become the standard tool to observe quantum impurity dynamics in Rydberg experiments. We investigate to what extent such experiments can be sensitive to details in the electron-atom interaction potential, such as the rapid radial modulation of the Rydberg molecular potential, or p-wave shape resonance. We demonstrate that both effects are crucial for the initial condensate response within the Rydberg orbit, but become less relevant for the density waves emerging outside the Rydberg excitation region at later times. Finally we explore the local dynamics of condensate heating. We find that it provides only minor corrections to the mean-field dynamics.

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Tailoring Bose-Einstein-condensate environments for a Rydberg impurity

Cited by 11 publications

References 74 publications

Collective Excitations of Bose–Einstein Condensate in a Rydberg Atom

Collective Excitations of Bose–Einstein Condensate in a Rydberg Atom

Einstein-Podolsky-Rosen steering of quantum phases in a cavity Bose-Einstein condensate with a single impurity

Dynamics of atoms within atoms

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