A noise-immune cavity-assisted non-destructive detection for an optical lattice clock in the quantum regime

Abstract : We present and implement a non-destructive detection scheme for the transition probability readout of an optical lattice clock. The scheme relies on a differential heterodyne measurement of the dispersive properties of lattice-trapped atoms enhanced by a high finesse cavity. By design, this scheme offers a 1st order rejection of the technical noise sources, an enhanced signal-to-noise ratio, and an homogeneous atom-cavity coupling. We theoretically show that this scheme is optimal with respect to the photon shot noise limit. We experimentally realise this detection scheme in an operational strontium optical lattice clock. The resolution is on the order of a few atoms with a photon scattering rate low enough to keep the atoms trapped after detection. This scheme opens the door to various different interrogations protocols, which reduce the frequency instability, including atom recycling, zero-dead time clocks with a fast repetition rate, and sub quantum projection noise frequency stability.
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New Journal of Physics, Institute of Physics: Open Access Journals, 2017, 19, pp.83002. 〈10.1088/1367-2630/aa7c84〉
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G Vallet, E Bookjans, U Eismann, S Bilicki, R Le Targat, et al.. A noise-immune cavity-assisted non-destructive detection for an optical lattice clock in the quantum regime. New Journal of Physics, Institute of Physics: Open Access Journals, 2017, 19, pp.83002. 〈10.1088/1367-2630/aa7c84〉. 〈hal-01579411〉

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