Robust gate design for large ion crystals through excitation of local phonon modes

• URL: http://arxiv.org/abs/2207.04583v1
• Date: Mon, 11 Jul 2022 02:17:31 GMT
• Title: Robust gate design for large ion crystals through excitation of local phonon modes
• Authors: L.-M. Duan
• Abstract summary: We propose a scalable design of entangling quantum gates for large ion crystals. The gate design is universal and applicable for large ion crystals of arbitrary sizes.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a scalable design of entangling quantum gates for large ion crystals with the following desirable features: 1) The gate design is universal and applicable for large ion crystals of arbitrary sizes; 2) The gate has no speed limitation and can work outside of the Lamb-Dicke region; 3) The gate operates by driving from either continuous-wave or pulsed laser beams; 4) The gate is insensitive to slow variation of the laser optical phase and works under a thermal state for the ions' motion; 5) The intrinsic gate infidelity can be reduced to a level well below the threshold for fault-tolerant quantum computation under realistic experimental parameters. Different from the previous gate schemes, here we propose a gate design based on driving of the local oscillation mode of the ions instead of the collective normal modes and develop a formalism based on the Heisenberg equations to deal with the many-body quantum dynamics outside of the Lamb-Dicke region.

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