Fast Accurate State Measurement with Superconducting Qubits
Fast Accurate State Measurement with Superconducting Qubits
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DOI：
10.1103/physrevlett.112.190504
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发表时间：
2014-05-15
影响因子：
8.6
通讯作者：
Martinis, John M.
中科院分区：
文献类型：
--
作者：
Jeffrey, Evan;Sank, Daniel;Martinis, John M.
超导量子比特实验需要更大数量的量子比特和反馈等先进技术，因此需要更快、更精确的状态测量。我们设计了一个带通滤波器的多路复用测量系统，可以在不增加量子比特的环境阻尼的情况下进行快速测量。我们用它来演示在单个超导集成电路上同时测量四个量子比特，其中最快的可以在140 ns内测量到99.8%的精度。这种精度和速度适用于包括表面码纠错在内的高级多量子位实验。
Faster and more accurate state measurement is required for progress in superconducting qubit experiments with greater numbers of qubits and advanced techniques such as feedback. We have designed a multiplexed measurement system with a bandpass filter that allows fast measurement without increasing environmental damping of the qubits. We use this to demonstrate simultaneous measurement of four qubits on a single superconducting integrated circuit, the fastest of which can be measured to 99.8% accuracy in 140 ns. This accuracy and speed is suitable for advanced multiqubit experiments including surface-code error correction.