Fast Preparation and Detection of a Rydberg Qubit Using Atomic Ensembles,Physical Review Letters

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Fast Preparation and Detection of a Rydberg Qubit Using Atomic Ensembles
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-27 , DOI: 10.1103/physrevlett.127.050501
Wenchao Xu ₁ , Aditya V Venkatramani _{1,

2} , Sergio H Cantú ₁ , Tamara Šumarac _{1,

2} , Valentin Klüsener _{1,

3} , Mikhail D Lukin ₂ , Vladan Vuletić ₁

Affiliation

We demonstrate a new approach for fast preparation, manipulation, and collective readout of an atomic Rydberg-state qubit. By making use of Rydberg blockade inside a small atomic ensemble, we prepare a single qubit within

3 μ s

with a success probability of

F_{p} = 0.93 \pm 0.02

, rotate it, and read out its state in

6 μ s

with a single-shot fidelity of

F_{d} = 0.92 \pm 0.04

. The ensemble-assisted detection is

10^{3}

times faster than imaging of a single atom with the same optical resolution, and enables fast repeated nondestructive measurement. We observe qubit coherence times of

15 μ s

, much longer than the

π

rotation time of 90 ns. Potential applications ranging from faster quantum information processing in atom arrays to efficient implementation of quantum error correction are discussed.

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