Robust phase-controlled gates for scalable atomic quantum processors using optical standing waves

Shannon Whitlock

European Center for Quantum Sciences and aQCess - Atom Quantum Computing as a Service, Institut de Science et d’Ingénierie Supramoléculaire (UMR 7006), University of Strasbourg and CNRS

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A simple scheme is presented for realizing robust optically controlled quantum gates for scalable atomic quantum processors by driving the qubits with optical standing waves. Atoms localized close to the antinodes of the standing wave can realize phase-controlled quantum operations that are potentially more than an order of magnitude less sensitive to the local optical phase and atomic motion than corresponding travelling wave configurations. The scheme is compatible with robust optimal control techniques and spatial qubit addressing in atomic arrays to realize phase controlled operations without the need for tight focusing and precise positioning of the control lasers. This will be particularly beneficial for quantum gates involving Doppler sensitive optical frequency transitions and provides an all optical route to scaling up atomic quantum processors.

We put forward a simple scheme for realizing robust optically controlled quantum gates for scalable atomic quantum processors by driving the qubits with optical standing waves. Compared to existing strategies based on travelling wave lasers, atoms localized close to the antinodes of an optical standing wave can be made to realize phase-controlled quantum operations, even without the need for tight focusing of the control lasers, that are inherently much less sensitive to atomic position variations and atomic motion, thus providing a route to circumvent several dominant errors for atom based quantum processors.

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Cited by

[1] Nicolas Douard, Ahmed Samet, George Giakos, and Denis Cavallucci, IFIP Advances in Information and Communication Technology 682, 139 (2023) ISBN:978-3-031-42531-8.

[2] Sven Jandura, Jeff D. Thompson, and Guido Pupillo, "Optimizing Rydberg Gates for Logical-Qubit Performance", PRX Quantum 4 2, 020336 (2023).

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