[Triumf-seminars] TRIUMF Special Seminar today at 10:00

[TRIUMF Seminars]

Date/Time: Wed 2020-06-17 at 10:00

Location:  Virtual             

Speaker:   Akio Kawasaki (Stanford University)

Title:     Precision Measurements with Ytterbium for Searches for Physics beyond the Standard Model

Abstract: State-of-the-art atomic clocks have extremely high relative stability of 1x10**-18, and with such high precision, atomic clocks can address some fundamental physics. One of the main factors that limit their stability is the standard quantum limit due to the quantum projection noise arising at the moment of state measurements. The standard quantum limit is overcome by generating a squeezed spin state between the ground state and the excited state for the clock transition.
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To demonstrate the improvement in the stability of the atomic clock with a squeezed spin state, we
constructed a cavity quantum electrodynamics system, where ytterbium-171 atoms have strong coupling between photons, capable of performing spin squeezing in spin 1/2 system of its ground state. With this apparatus, nearly-unitary spin squeezing with a metrological gain of 6.5 dB at the ground state is achieved. The squeezed spin state is subsequently transferred to the 3P_0 excited state of the clock transition, maintaining its metrological gain at the ground state. This is the first realization of the squeezed spin state between the ground state and an electronic excited state.
This squeezed spin state with 4.4 dB metrological gain showed a factor of 2.8 improvement in the stability of the atomic clock compared to the standard quantum limit without spin squeezing.
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In this talk, starting from introduction to atomic clocks, I will discuss this cavity quantum electrodynamics system and results on spin squeezing and enhancement in the stability of the atomic clock. In the end, I will mention the future direction of ytterbium spectroscopy towards search for physics beyond the Standard Model with a newly predicted second clock transition, focusing on the isotope shift measurements

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Seminar at https://bluejeans.com/780255733   ----- Students and postdocs share research at https://bluejeans.com/304423781/6167 at 12:45

Scientist candidate for fundamental physics with ISAC

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General TRIUMF seminar information available at http://www.triumf.ca/home/upcoming-events/about-seminars-lectures