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Session P1b: Advances in Ground Atomic Clocks

Universal Quantum Operations and Ancilla-Based Readout for Tweezer Clocks
Ran Finkelstein, Richard Bing-Shiun Tsai, Xiangkai Sun, Pascal Scholl, Su Direkci, Tuvia Gefen, Caltech; Joonhee Choi, Stanford University; Adam L. Shaw, and Manuel Endres, Caltech
Location: Royal Ballroom AB
Date/Time: Tuesday, Jan. 27, 4:46 p.m.

We realize programmable quantum circuits for optical clock qubits using strontium-88 atoms trapped in optical tweezers. We demonstrate high-fidelity entangling gates mediated by Rydberg interactions, design a circuit to benchmark its fidelity, and achieve a fidelity of 0.9971(5), which forms a new state-of-the-art for neutral atoms. Combining these with local addressing, dynamical connectivity, and mid-circuit ancilla-based detection, we realize algorithms designed to improve quantum metrology. First, we utilize such universal programmability to demonstrate the simultaneous generation of a cascade of clock Greenberger-Horne-Zeilinger (GHZ) states of different sizes, which collectively form an optimal entangled probe state. Second, we design repetitive ancilla-based quantum logic spectroscopy (QLS) of clock qubits. We show that this enables fast phase detection with non-destructive conditional reset of clock qubits and minimal dead time between repetitions. We discuss prospects for hybrid devices composed of processing and sensing modules and show first steps toward such a design. Our demonstration extends the set of operations accessible for hybrid quantum processor-clock devices and highlights how these can be harnessed to improve the performance of quantum sensors.

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