High-Fidelity Two-Qubit Gates Using a Microelectromechanical-System-Based Beam Steering System for Individual Qubit Addressing
Abstract
In a large scale trapped atomic ion quantum computer, high-fidelity two-qubit gates need to be extended over all qubits with individual control. We realize and characterize high-fidelity two-qubit gates in a system with up to four ions using radial modes. The ions are individually addressed by two tightly focused beams steered using microelectromechanical system mirrors. We deduce a gate fidelity of 99.49(7)% in a two-ion chain and 99.30(6)% in a four-ion chain by applying a sequence of up to 21 two-qubit gates and measuring the final state fidelity. We characterize the residual errors and discuss methods to further improve the gate fidelity towards values that are compatible with fault-tolerant quantum computation.
- Publication:
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Physical Review Letters
- Pub Date:
- October 2020
- DOI:
- arXiv:
- arXiv:2003.12430
- Bibcode:
- 2020PhRvL.125o0505W
- Keywords:
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- Quantum Physics;
- Physics - Atomic Physics
- E-Print:
- 8 pages, 4 figures