Robust entanglement gates for trapped-ion qubits

Abstract

High-fidelity two-qubit entangling gates play an important role in many quantum information processing tasks and are a necessary building block for constructing a universal quantum computer. Such high-fidelity gates have been demonstrated on trapped-ion qubits, however, control errors and noise in gate parameters may still lead to reduced fidelity. Here we propose and demonstrate a general family of two-qubit entangling gates which are robust to different sources of noise and control errors. These gates generalize the celebrated Mølmer-Sørensen gate by using multi-tone drives. We experimentally implemented several of the proposed gates on ${}^{88}{\text{Sr}}^{+}$ ions trapped in a linear Paul trap, and verified their resilience.

arXiv commentMain text - 5 pages, 5 figures, Supplemental Materials - 3 pages, 3 figures

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