Faraday-shielded, DC Stark-free optical lattice clock

Abstract

We demonstrate the absence of a DC Stark shift in an ytterbium optical lattice clock. Stray electric fields are suppressed through the introduction of an in-vacuum Faraday shield. Still, the effectiveness of the shielding must be experimentally assessed. Such diagnostics are accomplished by applying high voltage to six electrodes, which are grounded in normal operation to form part of the Faraday shield. Our measurements place a constraint on the DC Stark shift at the $10^{-20}$ level, in units of the clock frequency. Moreover, we discuss a potential source of error in strategies to precisely measure or cancel non-zero DC Stark shifts, attributed to field gradients coupled with the finite spatial extent of the lattice-trapped atoms. With this consideration, we find that Faraday shielding, complemented with experimental validation, provides both a practically appealing and effective solution to the problem of DC Stark shifts in optical lattice clocks.

arXiv comment5 pages + supplemental material; accepted to PRL

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Cited by in corpus (10)

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• Excited-Band Coherent Delocalization for Improved Optical Lattice Clock Performance
• Cryogenic Optical Lattice Clock with $1.7\times 10^{-20}$ Blackbody Radiation Stark Uncertainty
• A magneto-optical trap with millimeter ball lenses
• Evaluation of the blackbody radiation shift of an Yb optical lattice clock at KRISS
• Quantum Sensing Using Atomic Clocks for Nuclear and Particle Physics
• Decoherence of Atomic Ensembles in Optical Lattice Clocks by Gravity