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Quantum phase transition modulation in an atomtronic Mott switch
摘要： Mott insulators provide stable quantum states and long coherence times due to small number fluctuations, making them good candidates for quantum memory and atomic circuits. We propose a proof-of-principle for a 1D Mott switch using an ultracold Bose gas and optical lattice. With time-evolving block decimation simulations—efficient matrix product state methods—we design a means for transient parameter characterization via a local excitation for ease of engineering into more complex atomtronics. We perform the switch operation by tuning the intensity of the optical lattice, and thus the interaction strength through a conductance transition due to the confined modifications of the 'wedding cake' Mott structure. We demonstrate the time-dependence of Fock state transmission and fidelity of the excitation as a means of tuning up the device in a double well and as a measure of noise performance. Two-point correlations via the g(2) measure provide additional information regarding superfluid fragments on the Mott insulating background due to the confinement of the potential.
关键词： quantum gas,atomtronic switch,optical lattice,atomtronics,quantum phase transition,matrix product states,Mott insulator
更新于2025-09-23 15:23:52
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Strongly Correlated Quantum Gas Prepared by Direct Laser Cooling
摘要： We create a one-dimensional strongly correlated quantum gas of 133Cs atoms with attractive interactions by direct laser cooling in 300 ms. After compressing and cooling the optically trapped atoms to the vibrational ground state along two tightly confined directions, the emergence of a non-Gaussian time-of-flight distribution along the third, weakly confined direction reveals that the system enters a quantum degenerate regime. We observe a reduction of two- and three-body spatial correlations and infer that the atoms are directly cooled into a highly correlated excited metastable state, known as a super-Tonks-Girardeau gas.
关键词： super-Tonks-Girardeau gas,quantum gas,strongly correlated,laser cooling
更新于2025-09-23 15:19:57
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Laser-assisted self-induced Feshbach resonance for controlling heteronuclear quantum gas mixtures
摘要： We propose a type of Feshbach resonance occurring when two different ultracold atoms in their ground state undergo an s-wave collision in the presence of a laser. The collisional levels of the atom pair are coupled by the laser to a rovibrational molecular level of the same electronic ground state: We name it a laser-assisted self-induced Feshbach resonance. This mechanism, valid for all heteronuclear quantum gas mixtures, is analyzed on the example of ultracold 87Rb and 84Sr atoms for which the resonant laser frequency falls in the subterahertz range. The interspecies scattering length can be controlled with the laser frequency and intensity without atom loss. Moreover, chirping slowly, the frequency allows for the adiabatic formation of ultracold 87Rb 84Sr molecules in a manner very similar to a magnetic Feshbach resonance. A stimulated Raman adiabatic passage follows for stabilizing the molecules in their rovibronic ground state.
关键词： scattering length,molecule formation,quantum gas mixtures,laser-assisted,Feshbach resonance,ultracold atoms
更新于2025-09-11 14:15:04
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An approach to spin-resolved molecular gas microscopy
摘要： Ultracold polar molecules are an ideal platform for studying many-body physics with long-range dipolar interactions. Experiments in this field have progressed enormously, and several groups are pursuing advanced apparatus for manipulation of molecules with electric fields as well as single-atom-resolved in situ detection. Such detection has become ubiquitous for atoms in optical lattices and tweezer arrays, but has yet to be demonstrated for ultracold polar molecules. Here we present a proposal for the implementation of site-resolved microscopy for polar molecules, and specifically discuss a technique for spin-resolved molecular detection. We use numerical simulation of spin dynamics of lattice-confined polar molecules to show how such a scheme would be of utility in a spin-diffusion experiment.
关键词： quantum gas microscopy,quantum simulation,ultracold molecules,single-molecule control,dipolar spin models,optical lattices
更新于2025-09-09 09:28:46
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Ytterbium, You are Cool Enough to Go under the Quantum Gas Microscope!
摘要： Researchers at Kyoto University have developed a novel technique for imaging alkaline-earth atoms using a quantum gas microscope. Ytterbium (Yb) plays an important role in the Atomic, Molecular, and Optical (AMO) physics community because its optical properties are well suited for various applications. The Yb ion is popular as a doping material for fiber lasers and amplifiers. Narrow optical transitions in Yb atoms have been used in optical lattice clock experiments to attain the best performance for optical frequency standards. Now, Shibata et al. claim that a quantum gas of Yb atoms can be studied using a microscope to solve the mystery of strongly correlated gases.
关键词： strongly correlated gases,alkaline-earth atoms,quantum gas microscope,optical lattice,Ytterbium
更新于2025-09-04 15:30:14