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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster I
Q 23.9: Poster
Dienstag, 12. März 2024, 17:00–19:00, Tent B
Design and realization of a high-finesse optical resonator for cavity-assisted readout of atomic arrays — •Jacopo De Santis1,2, Mehmet Öncu1,2, Balázs Dura-Kovács1,2, Sebastian Ruffert1,2, and Johannes Zeiher1,2 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
The ability to read out a subset of a quantum register during the execution of an algorithm is a fundamental ingredient for fault tolerant quantum computation. But for this mid-circuit measurement to be effective, it should satisfy some specific requirements: be fast compared to the qubit decoherence time, have low error rates and be nondestructive of the qubits which are not being read out. However, free space measurements of qubits encoded in neutral atoms are rather slow, or destructive of nearby atoms due to the heating associated with scattered photons. Coupling an atomic array to a high-finesse optical resonator is a promising solution to these problems: thanks to the Purcell effect, not only can we detect a higher fraction of the fluoresced photons, but the directionality of the emission makes it less likely for the scattered photons to be reabsorbed by other atoms in the array. In this poster I will focus on the design criteria for such a cavity and describe how it can be used for qubit readout. Lastly, I will present some of the more practical aspects in the realization of a high-finesse optical resonator. In particular, I will introduce the setup I developed for testing and assembling a near-concentric cavity with cooperativity C≥7.
Keywords: Qubit readout; Quantum feedback; Optical cavity