Publications by authors named "Zunqi Li"
We investigate entangled x-ray photon pair emissions in a free-electron laser (FEL) and establish a quantum electrodynamical theory for coherently amplified entangled photon pair emission from microbunched electron pulses in the undulator. We provide a scheme to generate highly entangled x-ray photon pairs and numerically demonstrate the properties of entangled emission, which is of great importance in x-ray quantum optics. Our work shows a unique advantage of FELs in entangled x-ray photon pair generation.
View Article and Find Full Text PDFUtilizing the anti-Zeno effect, we demonstrate that the resonances of ultracold molecular interactions can be selectively controlled by modulating the energy levels of molecules with a dynamic magnetic field. We show numerically that the inelastic scattering cross section of the selected isotopic molecules in the mixed isotopic molecular gas can be boosted for 2-3 orders of magnitude by modulation of Zeeman splittings. The mechanism of the resonant anti-Zeno effect in the ultracold scattering is based on matching the spectral modulation function of the magnetic field with the Floquet-engineered resonance of the molecular collision.
View Article and Find Full Text PDFArticle Synopsis
- - Researchers show that it's possible to control the final states of ultracold molecules when they scatter with atoms by using dynamic magnetic fields at multiple frequencies.
- - A new method called multifrequency Floquet coupled channel method is developed to analyze how these magnetic fields influence which channels are selected during scattering.
- - The study specifically highlights the atom-molecule spin-flip scattering, demonstrating that certain transitions can be suppressed through engineered coupling, reflecting a generalized quantum Zeno effect.