Reduced Sensitivity to Charge Noise in Semiconductor Spin Qubits via Symmetric Operation
Reduced Sensitivity to Charge Noise in Semiconductor Spin Qubits via Symmetric Operation
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DOI：
10.1103/physrevlett.116.110402
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发表时间：
2016-03-16
影响因子：
8.6
通讯作者：
Hunter, A. T.
中科院分区：
文献类型：
--
作者：
Reed, M. D.;Maune, B. M.;Hunter, A. T.
我们展示了交换耦合半导体量子点的改进操作，大大降低了交换操作的电荷噪声的敏感性。该方法涉及偏置双点之间的电荷状态的反交叉对称，其中相对于栅极电压的交换能量的导数被最小化。通过调整隧道耦合，交换保持高度可调。我们发现，这种方法减少了电荷噪声的失相效应的一个以上的因素5相比，在附近的电荷状态的反交叉操作，增加了我们的量子位的可观察到的交换振荡的数量由一个类似的因素。性能也随着汇率的提高而提高，有利于快速量子操作。
We demonstrate improved operation of exchange-coupled semiconductor quantum dots by substantially reducing the sensitivity of exchange operations to charge noise. The method involves biasing a double dot symmetrically between the charge-state anticrossings, where the derivative of the exchange energy with respect to gate voltages is minimized. Exchange remains highly tunable by adjusting the tunnel coupling. We find that this method reduces the dephasing effect of charge noise by more than a factor of 5 in comparison to operation near a charge-state anticrossing, increasing the number of observable exchange oscillations in our qubit by a similar factor. Performance also improves with exchange rate, favoring fast quantum operations.