Preserving a qubit during state-destroying operations on an adjacent qubit at a few micrometers distance

Sainath Motlakunta (), Nikhil Kotibhaskar, Chung-You Shih, Anthony Vogliano, Darian McLaren, Lewis Hahn, Jingwen Zhu, Roland Hablützel and Rajibul Islam
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Sainath Motlakunta: University of Waterloo
Nikhil Kotibhaskar: University of Waterloo
Chung-You Shih: University of Waterloo
Anthony Vogliano: University of Waterloo
Darian McLaren: University of Waterloo
Lewis Hahn: University of Waterloo
Jingwen Zhu: University of Waterloo
Roland Hablützel: University of Waterloo
Rajibul Islam: University of Waterloo

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Protecting qubits from accidental measurements is essential for controlled quantum operations, especially during state-destroying measurements or resets on adjacent qubits, in protocols like quantum error correction. Current methods to preserve atomic qubits against such disturbances waste coherence time, extra qubits, and introduce additional errors. We demonstrate the feasibility of in-situ state-reset and state-measurement of trapped ions, achieving >99.9% fidelity in preserving an ‘asset’ ion-qubit while a neighboring ‘process’ qubit is reset, and >99.6% preservation fidelity while applying a detection beam for 11 μs on the same neighbor at a distance of 6 μm. This is achieved through precise wavefront control of addressing optical beams and using a single ion as both a quantum sensor for optical aberrations and an intensity probe with >50 dB dynamic range. Our demonstrations advance quantum processors, enhancing speed and capabilities for tasks like quantum simulations of dissipation and measurement-driven phases, and implementing error correction.

Date: 2024
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DOI: 10.1038/s41467-024-50864-2

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