论文标题
由于观众Qubits而导致的受控相对门中的基准测试误差
Benchmarking Coherent Errors in Controlled-Phase Gates due to Spectator Qubits
论文作者
论文摘要
操作多量量子处理器的主要挑战是减轻多量相干错误。对于超导电路，除了源自控制线不完善的串扰外，Qubits之间的分散耦合是多Qubit的相干误差的主要来源。由于与一个或多个观众码头涉及的两个量子位的分散耦合，我们在受控相栅极中基准的相位误差。我们使用量子过程断层扫描测量相关的门不忠。此外，我们指出，由于门Qubits耦合到门期间的非计算状态，因此增强了两Qubit的条件相误差。我们的工作对于理解对多Quition设置中有限的ON/OFF比率的两倍大门的忠诚度的限制很重要。
A major challenge in operating multi-qubit quantum processors is to mitigate multi-qubit coherent errors. For superconducting circuits, besides crosstalk originating from imperfect isolation of control lines, dispersive coupling between qubits is a major source of multi-qubit coherent errors. We benchmark phase errors in a controlled-phase gate due to dispersive coupling of either of the qubits involved in the gate to one or more spectator qubits. We measure the associated gate infidelity using quantum process tomography. In addition, we point out that, due to coupling of the gate qubits to a non-computational state during the gate, two-qubit conditional phase errors are enhanced. Our work is important for understanding limits to the fidelity of two-qubit gates with finite on/off ratio in multi-qubit settings.
