Driven Rydberg atoms reveal quartic level repulsion

Three-body interaction of Rydberg slow light polaritons

We study a system of three photons in an atomic medium coupled to Rydberg states near the conditions of electromagnetically induced transparency. Based on the analytical analysis of the microscopic set of equations in the far-detuned regime, the effective three-body interaction for these Rydberg polaritons is derived. For slow light polaritons, we find a strong three-body repulsion with the remarkable property that three polaritons can become essentially non-interacting at short distances. This analysis allows us to derive the influence of the three-body repulsion on bound states and correlati…

Cavity polaritons with Rydberg blockade and long-range interactions

We study interactions between polaritons, arising when photons strongly couple to collective excitations in an array of two-level atoms trapped in an optical lattice inside a cavity. We consider two types of interactions between atoms: Dipolar forces and atomic saturability, which ranges from hard-core repulsion to Rydberg blockade. We show that, in spite of the underlying repulsion in the subsystem of atomic excitations, saturability induces a broadband bunching of photons for two-polariton scattering states. We interpret this bunching as a result of interference, and trace it back to the mis…

Interaction-induced stabilization of circular Rydberg atoms

We discuss a candidate solution for the controlled trapping and manipulation of two individual Rydberg atoms by means of a magnetic Ioffe-Pritchard trap that is superimposed by a constant electric field. In such a trap Rydberg atoms experience a permanent electric dipole moment that can be of the order of several hundred Debye. The interplay of electric dipolar repulsion and three dimensional magnetic confinement leads to a well controllable equilibrium configuration with tunable trap frequency and atomic distance. We thoroughly investigate the trapping potentials and analyze the interaction-i…

Self-generated quantum gauge fields in arrays of Rydberg atoms

As shown in recent experiments [V. Lienhard et al., Phys. Rev. X 10, 021031 (2020)], spin-orbit coupling in systems of Rydberg atoms can give rise to density-dependent Peierls Phases in second-order hoppings of Rydberg spin excitations and nearest-neighbor (NN) repulsion. We here study theoretically a one-dimensional zig-zag ladder system of such spin-orbit coupled Rydberg atoms at half filling. The second-order hopping is shown to be associated with an effective gauge field, which in mean-field approximation is static and homogeneous. Beyond the mean-field level the gauge potential attains a …

通过类施特恩-格拉赫实验探测两个里德伯原子的自旋-运动耦合

Probing spin-motion coupling of two Rydberg atoms by a Stern-Gerlach-like experiment

本研究提出并实现里德伯原子态依赖运动测量方案，通过类施特恩-格拉赫实验，利用光镊阵列同时读取原子内态与位置，验证了偶极相互作用介导的两里德伯原子自旋-运动耦合效应。

非绝热耦合作为长程里德堡分子中的稳定机制

Non-adiabatic couplings as a stabilization mechanism in long-range Rydberg molecules

本文提出非绝热耦合是长程里德堡分子的重要稳定机制，它通过提供额外势垒保护振动态免受预解离和非辐射跃迁，甚至在极端情况下完全主导分子结合使其寿命饱和于原子里德堡寿命。