Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer
Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer
复制标题
俘获离子量子计算机中单独寻址的两个量子位门的串扰抑制
DOI：
10.1103/physrevlett.129.240504
复制
发表时间：
2022
影响因子：
8.6
通讯作者：
Kim, Jungsang
中科院分区：
文献类型：
--
作者：
Fang, Chao;Wang, Ye;Huang, Shilin;Brown, Kenneth R.;Kim, Jungsang
由于控制信号的溢出引起的目标量子位和相邻旁观者量子位之间的串扰表示限制量子计算机中的两量子位纠缠门的保真度的主要误差源。我们表明，在我们的激光驱动的陷阱离子系统的相干串扰误差可以建模为residualinteraction，并可以主动取消单量子比特回波脉冲。我们提出并证明了一个串扰抑制方案，消除所有的一阶串扰只利用本地控制的目标量子位，而不是现有的计划，需要控制所有相邻的量子位。我们报告了一个两量子比特的贝尔态保真度为99.52（6）%的回波脉冲后，集体门和99.37（5）%的回波脉冲施加到每个门在一个五离子链。该方案可广泛应用于具有类似相互作用哈密顿量的其他平台。
Crosstalk between target and neighboring spectator qubits due to spillover of control signals represents a major error source limiting the fidelity of two-qubit entangling gates in quantum computers. We show that in our laser-driven trapped-ion system coherent crosstalk error can be modeled as residualinteraction and can be actively canceled by single-qubit echoing pulses. We propose and demonstrate a crosstalk suppression scheme that eliminates all first-order crosstalk utilizing only local control of target qubits, as opposed to an existing scheme which requires control over all neighboring qubits. We report a two-qubit Bell state fidelity of 99.52(6)% with the echoing pulses applied after collective gates and 99.37(5)% with the echoing pulses applied to each gate in a five-ion chain. This scheme is widely applicable to other platforms with analogous interaction Hamiltonians.