Robust Entanglement Gates for Trapped-Ion Qubits

• Published in: Physical review letters Vol. 121; no. 18; p. 180502
• Main Authors: Shapira, Yotam, Shaniv, Ravid, Manovitz, Tom, Akerman, Nitzan, Ozeri, Roee
• Format: Journal Article
• Language: English
• Published: United States American Physical Society 02-11-2018
• Subjects: Data processing; Gates; Noise control; Quantum computers; Quantum computing; Quantum entanglement; Quantum phenomena; Quantum theory; Qubits (quantum computing)
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.121.180502

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 renowned Mølmer-Sørensen gate by using multitone drives. We experimentally implemented several of the proposed gates on ^{88}Sr^{+} ions trapped in a linear Paul trap and verified their resilience.