Details

Autor(en) / Beteiligte

• Guo, Qiujiang
• Zheng, Shi-Biao
• Wang, Jianwen
• Song, Chao
• Zhang, Pengfei
• Li, Kemin
• Liu, Wuxin
• Deng, Hui
• Huang, Keqiang
• Zheng, Dongning
• Zhu, Xiaobo
• Wang, H
• Lu, C-Y
• Pan, Jian-Wei

Titel

Dephasing-Insensitive Quantum Information Storage and Processing with Superconducting Qubits

Ist Teil von

• Physical review letters, 2018-09, Vol.121 (13), p.130501-130501, Article 130501

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2018

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• A central task towards building a practical quantum computer is to protect individual qubits from decoherence while retaining the ability to perform high-fidelity entangling gates involving arbitrary two qubits. Here we propose and demonstrate a dephasing-insensitive procedure for storing and processing quantum information in an all-to-all connected superconducting circuit involving multiple frequency-tunable qubits, each of which can be controllably coupled to any other through a central bus resonator. Although it is generally believed that the extra frequency tunability enhances the control freedom but induces more dephasing impact for superconducting qubits, our results show that any individual qubit can be dynamically decoupled from dephasing noise by applying a weak continuous and resonant driving field whose phase is reversed in the middle of the pulse. More importantly, we demonstrate a new method for realizing a two-qubit phase gate with inherent dynamical decoupling via the combination of continuous driving and qubit-qubit swapping coupling. We find that the weak continuous driving fields not only enable the conditional dynamics essential for quantum information processing, but also protect both qubits from dephasing during the gate operation.