Work

High-fidelity manipulation of a qubit enabled by a manufactured nucleus

Year: 2020

Type: article

Abstract: The recently demonstrated trapping and laser cooling of 133Ba+ has opened the door to the use of this nearly ideal atom for quantum information processing. However, before high-fidelity qubit operations can be performed, a number of unknown state energies are needed. Here, we report measurements of the 2P3/2 and 2D5/2 hyperfine splittings, as well as the 2P3/2 ↔ 2S1/2 and 2P3/2 ↔ 2D5/2 transition frequencies. Using these transitions, we demonstrate high-fidelity 133Ba+ hyperfine qubit manipulation with electron shelving detection to benchmark qubit state preparation and measurement (SPAM). Using single-shot, threshold discrimination, we measure an average SPAM fidelity of $${\mathcal{F}}=0.99971(3)$$ F = 0.99971 ( 3 ) , a factor of ≈2 improvement over the best reported performance of any qubit.

Source: npj Quantum Information

DOI: 10.1038/s41534-020-0265-5

Authors: Justin E. Christensen, David Hucul, Wesley C. Campbell, Eric R. Hudson

Institutions: University of California, Los Angeles, United States Air Force Research Laboratory, Rome Laboratory

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,490

Funders: Army Research Office, Air Force Research Laboratory