Quantum Transport of Rydberg Excitons with Synthetic Spin-Exchange Interactions

Abstract

We present a scheme for engineering quantum transport dynamics of spin excitations in a chain of laser-dressed Rydberg atoms, mediated by synthetic spin-exchange arising from diagonal van der Waals interaction. The dynamic tunability and long-range interaction feature of our scheme allows for the exploration of transport physics unattainable in conventional spin systems. As two concrete examples, we first demonstrate a topological exciton pumping protocol that facilitates quantized entanglement transfer, and secondly we discuss a highly nonlocal correlated transport phenomenon which persists even in the presence of dephasing. Unlike previous schemes, our proposal requires neither resonant dipole-dipole interaction nor off-diagonal van der Waals interaction. It can be readily implemented in existing experimental systems.

Preparation of hundreds of microscopic atomic ensembles in optical tweezer arrays

“…Furthermore, we show that the fluctuations of the number of atoms in each tweezer is comparable to, or below the shot-noise limit for uncorrelated atoms. These properties make the system well suited for quantum simulation of quantum spin models 13,14,17,[34][35][36][37][38][39] and dynamics [40][41][42][43][44][45][46][47] in novel geometries, as well as for realizing quantum registers with collectively enhanced atom-light interactions for quantum information processing 11,36,[48][49][50][51] .…”

Generalizations of exactly solvable quantum spin models

“…The phases, which appear in the proposed generalizations of exactly solvable Hamiltonians, for systems like [7][8][9][10][11] have the internal spin-orbit nature. However, one can consider such phases as the consequence of the external magnetic or electric fluxes piercing closed periodic lattices (as one-dimensional rings or two-dimensional cylinders).…”

“…For instance, nonsymmetric under the exchange of spins off-diagonal components of the exchange interaction are known as the Dzyaloshinskii-Moria (DM) coupling [5,6]. Symmetric off-diagonal components (sometimes called the couplings) appear to be very important in the interaction of orbitals of strongly correlated electron systems [7], in particular in the so-called compass models [8] or in the socalled Kitaev materials [9], where their origin is related to pseudodipolar interactions, and also in Rydberg cold atoms with van der Waals interactions [10] and optical lattices with trapped ultracold fermions [11].…”

Coherent ground-state transport of neutral atoms

“…Recently quantum state transfer schemes based on Rydberg atoms have made rapid progresses both theoretically and experimentally [36][37][38][39][40][41][42][43][44][45][46][47]. According to different coding modes of qubit, these schemes can be divided into three categories.…”

“…For instance, Barredo et al [36] studied this hopping in a spin chain constructed by individually addressable Rydberg atoms by utilizing the long-range resonant dipole-dipole coupling. The second one is the quantum state transfer between ground state and Rydberg state which remains as a second-order process in terms of laser-spin coupling [40][41][42][43]. To reach this target, Yang et al [42] constructed an exchange interaction between ground state and Rydberg state, mediated by synthetic * shaoxq644@nenu.edu.cn spin exchange arising from diagonal van der Waals interaction.…”