Superconducting microwave cavity towards controlling the motion of polar molecules
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We propose the use of superconducting microwave cavities for the focusing and deceleration of cold polar molecular beams. A superconducting cavity with a high quality factor produces a large ac Stark shift in polar molecules, which allow us to efficiently control molecular motion. Our discussion is based on the experimental characterization of a prototype cavity: a lead–tin-coated cylindrical copper cavity, which has a quality factor of 106 and tolerates several watts of input power. Such a microwave device provides a powerful way to control molecules not only in low-field-seeking states, but also in high-field-seeking states such as the ground rotational state.
KeywordsQuality Factor High Quality Factor Diffraction Loss Unloaded Quality Factor Radial Confinement
We acknowledge D. DeMille and G. Meijer for their helpful advice and M. Schnell, A. Simon, H. Odashima, M. Kajita, F. Matsushima, and K. Kobayashi for their fruitful discussion. We also thank B. Ramshaw and D. Bonn for helping us perform the electroplating. This work is supported by an NSERC Discovery Grant and funds from CFI to CRUCS at UBC. This work is also partially supported by Grant-in-Aid for Scientific Research of JSPS (19840021, 21740300, 22104504), Matsuo foundation, Inamori foundation. K.E. acknowledges support from the Excellent Young Researchers Overseas Visit Program of JSPS for allowing him to visit UBC to perform this research.
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