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Global Journal of Human Social Science

Coding Quantum Information in Van Der Waals Repulsive States

Jianing Han

Published Oct 8, 2020• 0 citations
OpenAlex

Abstract

Van der Waals interactions are dipole-dipole interactions. In this article, we study the quantum information storage using repulsive van der Waals interaction coupled states. It is shown that if one atom is excited, the second excited atom will be able to change the state distribution of the first excited atom. This can be used to do remote control at the quantum level. In addition, by analyzing the components of the first excited atom, the distance between the two excited atoms and the state distribution of the second excited atom can be extracted. Such systems are essential for developing single-atom quantum sensors.

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Van der Waals interactions are dipole-dipole interactions. In this article, we study the quantum information storage using repulsive van der Waals interaction coupled states. It is shown that if one atom is excited, the second excited atom will be able to change the state distribution of the first excited atom. This can be used to do remote control at the quantum level. In addition, by analyzing the components of the first excited atom, the distance between the two excited atoms and the state distribution of the second excited atom can be extracted. Such systems are essential for developing single-atom quantum sensors.
We report on the direct measurement of the van der Waals interaction between two isolated, single Rydberg atoms separated by a controlled distance of a few micrometers. By working in a regime where the single-atom Rabi frequency of the laser used for excitation to the Rydberg state is comparable to the interaction energy, we observe a \emph{partial} Rydberg blockade, whereby the time-dependent populations of the various two-atom states exhibit coherent oscillations with several frequencies. A quantitative comparison of the data with a simple model based on the optical Bloch equations allows us to extract the van der Waals energy, and to observe its characteristic C6/R6C_6/R^6C6​/R6 dependence. The magnitude of the measured C6C_6C6​ coefficient agrees well with an \emph{ab-initio} theoretical calculation, and we observe its dramatic increase with the principal quantum number nnn of the Rydberg state. Our results not only allow to test an important physical law, but also demonstrate a degree of experimental control which opens new perspectives in quantum information processing and quantum simulation using long-range interactions between the atoms.
The van der Waals force between a single atom and a rod-like molecule is investigated by introducing a one-dimensional dipole–dipole interaction atomic model. The force between a single atom and its nearest neighbor atom in a rod-like molecule is related to the correlation between them, which is obtained by solving the problem of coupled quantum oscillators. The dependence of the correlation on the coupling constant between the single atom and atoms in the molecule are presented for different molecular weight. Furthermore, the transition of the force from attractive to repulsive in the excited state is considered with regard to the correlation.
Abstract Coherently manipulating Rydberg atoms in mesoscopic systems has proven challenging due to the unwanted population of nearby Rydberg levels by black-body radiation. Recently, there have been some efforts towards understanding these effects using states with a low principal quantum number that only have resonant dipole–dipole interactions. We perform experiments that exhibit black-body-induced dipole–dipole interactions for a state that also has a significant van der Waals interaction. Using an enhanced rate-equation model that captures some of the long-range properties of the dipolar interaction, we show that the initial degree of Rydberg excitation is dominated by the van der Waals interaction, while the observed linewidth at later times is dominated by the dipole–dipole interaction. We also point out some prospects for quantum simulation.
We report the direct measurement of the van der Waals interaction between two isolated, single Rydberg atoms separated by a controlled distance of a few micrometers. Working in a regime where the single-atom Rabi frequency for excitation to the Rydberg state is comparable to the interaction, we observe partial Rydberg blockade, whereby the time-dependent populations of the various two-atom states exhibit coherent oscillations with several frequencies. Quantitative comparison of the data with a simple model based on the optical Bloch equations allows us to extract the van der Waals energy, and observe its characteristic C6/R6 dependence. The measured C6 coefficients agree well with ab initio calculations, and we observe their dramatic increase with the principal quantum number n of the Rydberg state.
The highly excited atoms have a strong Van der Waals interaction as compared with the ground-state atoms, which can block the excitation of neighboring atoms and forming the blockade effect. In this work, the interaction between highly excited atoms is calculated using the perturbation theory, the interaction of nS and nD pair states and the dispersion coefficients are obtained. This shows that the interactions of the SS for both Rb and Cs atoms are repulsive, whereas the interaction of DD states is repulsive for Cs and attractive for Rb.