A5072231013- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Quantum, superfluid, helium dynamics
- Spectroscopy and Laser Applications
- Strong Light-Matter Interactions
- Spectroscopy and Quantum Chemical Studies
- Quantum Information and Cryptography
- Advanced Chemical Physics Studies
- Origins and Evolution of Life
- thermodynamics and calorimetric analyses
- Iron-based superconductors research
- Various Chemistry Research Topics
MIT-Harvard Center for Ultracold Atoms
2022-2025
Harvard University
2020-2025
Harvard University Press
2021-2024
Hong Kong University of Science and Technology
2016-2017
University of Hong Kong
2016-2017
Abstract Entangled photon pairs, termed as biphotons, have been the benchmark tool for experimental quantum optics. The quantum-network protocols based on photon–atom interfaces stimulated a great demand single photons with bandwidth comparable to or narrower than atomic natural linewidth. In past decade, laser-cooled atoms often used producing such but apparatus is too large and complicated engineering. Here we report generation of subnatural-linewidth (<6 MHz) biphotons from...
Chemical reactions, in which bonds break and form, are highly dynamic quantum processes. A fundamental question is whether coherence can be preserved chemical reactions then harnessed to generate entangled products. Here we investigated this by studying the 2KRb [Formula: see text][Formula: text] + Rb
A thorough understanding of molecular scattering in the ultralow temperature regime is crucial for realizing long coherence times and enabling tunable interactions gases, systems which offer many opportunities quantum simulation, information, precision measurement. Of particular importance nature long-lived intermediate complexes may be formed ultracold collisions, as such can dramatically affect stability even when exothermic reaction channels are not present. Here, we investigate...
We demonstrate the generation of high-quality narrowband biphotons from a Doppler-broadened hot rubidium atomic vapor cell. Choosing double-Λ energy level scheme for optimizing both spontaneous four-wave mixing nonlinear parametric interaction and electromagnetically induced transparency (EIT), we achieve biphoton spectral brightness as high 14 000 s−1 MHz−1. Meanwhile, apply spatially tailored optical pumping beam reduction Raman noise obtain violation Cauchy-Schwarz inequality by factor 1023.
We explore utilizing our previously observed reactive nuclear spin coherence to control the KRb + ultracold chemical reaction realize a interferometer.
We investigate collisional loss in an ultracold mixture of 40 K 87 Rb molecules and atoms, where chemical reactions between the two species are energetically forbidden.Through direct detection KRb * 2 intermediate complexes formed from atom-molecule collisions, we show that a 1064 nm laser source used for optical trapping sample can efficiently deplete complex population via photo-excitation, effect which explain universal two-body observed mixture.By monitoring time-evolution after sudden...
Coherent superpositions and entanglement are hallmarks of quantum mechanics, but they fragile can easily be perturbed by their environment. Selected isolated physical systems maintain coherence generate using well-controlled interactions. Chemical reactions, where bonds break form, highly dynamic processes. A fundamental question is whether preserved in chemical reactions then harnessed to entangled products. Here we investigate this studying the 2KRb $\rightarrow$ K$_2$ + Rb$_2$ reaction at...
Based on a theoretical model where the nuclear spins remain unchanged during collision, we provide an analytical and general expression for spin state-to-state distribution of ultracold diatom-diatom chemical reaction in magnetic field, given rotational transitions molecules. It simply requires knowledge field-dependent eigenfunctions molecular reactants products reaction. The final drastically changes with field. When is summed over all products, simplified found only required. present...
Energy transfer between different mechanical degrees of freedom in atom-molecule collisions has been widely studied and largely understood. However, systems involving spins remain less explored, especially with a state-to-state precision. Here, we directly observed the energy from atomic hyperfine to molecular rotation $^{87}$Rb ($|F_a,M_{F_a}\rangle = |2,2\rangle$) + $^{40}$K$^{87}$Rb (in rovibronic ground state $N=0$) $\longrightarrow$ Rb ($ |1,1\rangle$) KRb ($N=0,1,2$) exothermic...
We investigate collisional loss in an ultracold mixture of $^{40}$K$^{87}$Rb molecules and $^{87}$Rb atoms, where chemical reactions between the two species are energetically forbidden. Through direct detection KRb$_{2}^{*}$ intermediate complexes formed from atom-molecule collisions, we show that a $1064$ nm laser source used for optical trapping sample can efficiently deplete complex population via photo-excitation, effect which explain universal two-body observed mixture. By monitoring...
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