physics.atom-ph

Observation of intrastate and interstate facilitation between Rydberg S, P and D levels

This paper reports experimental observations and theoretical calculations of both intrastate and interstate facilitation effects among high-lying $S$, $P$, and $D$ Rydberg states in rubidium, demonstrating enhanced off-resonant excitation and correlated atom numbers consistent with repulsive and attractive Rydberg-Rydberg interactions.

Repeated weak measurements: watching quantum correlations evolve

This paper introduces a minimally invasive protocol using repeated weak measurements to directly observe the time evolution of many-body quantum correlations without external perturbation, successfully demonstrating the technique by measuring the Van Hove function and dynamical structure factor in an atomic Bose-Einstein condensate.

Observation of low-lying impurity states in Bose-Einstein condensates

Using pump-probe ejection spectroscopy on 39K Bose-Einstein condensates, researchers observed significant low-energy spectral weight below the standard Bose polaron peak that, while consistent with both dressed impurity and bipolaron theoretical models, is best explained by the formation of bipolaron states due to attractive interactions mediated by the condensate.

Preparation of quasi-two-dimensional Bose mixture of ultracold $^{23}$Na and $^{87}$Rb atoms

This paper reports the successful preparation of a quasi-two-dimensional heteronuclear quantum degenerate mixture of ultracold $^{23}$Na and $^{87}$Rb atoms using a versatile experimental apparatus, demonstrating quantum immiscibility that aligns with mean-field theories and establishing a platform for future low-dimensional quantum studies.

High precision micro-optical elements on fiber facets via focused-ion beam machining

This paper demonstrates the single-step, high-precision fabrication of various micro-optical structures (spherical, spiral, and axicon) directly on single-mode fiber facets using focused ion beam machining, achieving nanometer-scale shape accuracy and optical-grade surface quality to enable advanced applications in quantum information processing and structured light generation.

Coherent terahertz field tomographic imaging in warm Rydberg vapors

This paper presents a coherent terahertz-to-optical conversion scheme in warm rubidium vapor that enables phase-resolved tomographic imaging of terahertz fields, allowing for the reconstruction of complex field amplitudes and the identification of incident angles at room temperature.

AtomTwin.jl: a physics-native digital twin framework for neutral-atom quantum processors

This paper introduces AtomTwin.jl, an open-source Julia framework that bridges mathematical models and physical devices to enable the automated simulation and digital twin development of neutral-atom quantum processors, demonstrated through the preparation of a logical Bell state in a $[[4,2,2]]$ error-detecting code.

Dissipative Preparation of Correlated Quantum States in Dipolar Rydberg Arrays

This paper proposes a scalable, dissipative protocol for neutral atom Rydberg arrays that utilizes controllable auxiliary atoms to engineer nonreciprocal, energy-selective transitions, thereby enabling the stabilization of arbitrary correlated many-body quantum states across the spectrum without requiring prior knowledge of the system's Hamiltonian.

Rotational state changes in collisions of diatomic molecular ions with atomic ions

INTENTAS -- An entanglement-enhanced atomic sensor for microgravity

The INTENTAS project aims to develop a compact, all-optical atomic sensor utilizing entangled Bose-Einstein condensates in a microgravity environment to achieve high-precision quantum measurements, with a successful ground-based demonstration paving the way for future space deployment.