Fast mixed-species quantum logic gates for trapped-ion quantum networks

• URL: http://arxiv.org/abs/2412.07185v2
• Date: Wed, 26 Mar 2025 05:08:10 GMT
• Title: Fast mixed-species quantum logic gates for trapped-ion quantum networks
• Authors: Zain Mehdi, Varun D. Vaidya, Isabelle Savill-Brown, Phoebe Grosser, Alexander K. Ratcliffe, Haonan Liu, Simon A. Haine, Joseph J. Hope, C. Ricardo Viteri,
• Abstract summary: We propose an approach to high-speed mixed-speciesangling operations in trapped-ion quantum computers.<n>We develop the theory and machine-design of pulse sequences that realise MHz-speed fast gates'<n>We show enables the protection of matter-photon interfaces against rapid spin dephasing in optical networks of trapped-ion processors.
• Score: 34.26719239756968
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum logic operations between physically distinct qubits is an essential aspect of large-scale quantum information processing. We propose an approach to high-speed mixed-species entangling operations in trapped-ion quantum computers, based on mechanical excitation of spin-dependent ion motion by ultrafast pulsed lasers. We develop the theory and machine-design of pulse sequences that realise MHz-speed `fast gates' between a range of mixed-isotope and mixed-species ion pairings with experimentally-realistic laser controls. We demonstrate the robustness of the gate mechanism against expected experimental errors, and identify errors in ultrafast single-qubit control as the primary technical limitation. The proposed mixed-species gate mechanism can be used for fast transfer of quantum information between specialized qubits and quantum memories, which we show enables the protection of matter-photon interfaces against rapid spin dephasing in optical networks of trapped-ion processors.

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