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A: Fachverband Atomphysik

A 29: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)

A 29.1: Hauptvortrag

Freitag, 10. März 2023, 11:00–11:30, F303

An elementary network of entangled optical atomic clocks — •Raghavendra Srinivas, Bethan Nichol, David Nadlinger, Peter Drmota, Dougal Main, Gabriel Araneda, Chris Ballance, and David Lucas — University of Oxford

Optical atomic clocks are our most precise tools to measure time and frequency. Precision frequency comparisons between atoms in separate locations can be used to probe the space-time variation of fundamental constants, the properties of dark matter, and for geodesy. Such frequency comparisons on independent systems are typically limited by the standard quantum limit (SQL). Here, we demonstrate the first quantum network of entangled optical clocks using two ⁸⁸Sr⁺ ions separated by a macroscopic distance (2 m), that are entangled using a photonic link. We use this network to perform entanglement-enhanced frequency comparisons beyond the SQL[1]. This two-node network could be extended to additional nodes, to other species of trapped particles, or to larger entangled systems via local operations.

[1] Nichol, Srinivas et al., Nature 609, 689-694 (2022)