The remarkable precision of optical atomic clocks offers sensitivity to new and exotic physics through tests of relativity, searches for dark matter, gravitational wave detection, and probes for beyond Standard Model particles. We have recently realized a “multiplexed” strontium optical lattice clock consisting of two or more clocks in one vacuum chamber.
In this talk I will explain the motivation, concept, and operating principles of our multiplexed optical lattice clock. I will then present recent experimental results in which we performed a novel, blinded, precision test of the gravitational redshift with an array of 5 evenly-spaced atomic ensembles spanning a total height difference of 1 cm. I will present the error budget produced from our systematic evaluation, and the recently unblinded results of our first test.Finally, I will discuss the outlook for future searches for new physics with our apparatus, including a novel direct test of the Einstein Equivalence Principle.
Optical lattice clocks (OLCs) are now the most stable and accurate timekeepers in the world, with fractional uncertainties equivalent to neither losing nor gaining a second over the entire age of the universe. This unprecedented level of metrological precision offers sensitivity to new physical phenomena, opening the door to exciting and unusual applications. I will give a brief overview of emerging applications of OLCs, including gravitational wave detection, tests of general relativity, and searches for physics beyond the Standard Model. I will discuss the concept and basic operating principles of the multiplexed OLC we have constructed. Finally, I will present recent experimental progress we have made towards measuring the gravitational redshift at the centimeter scale using the multiplexed OLC.
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