Suppressing charge noise decoherence in superconducting charge qubits
Suppressing charge noise decoherence in superconducting charge qubits
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DOI：
10.1103/physrevb.77.180502
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发表时间：
2008-05-01
影响因子：
3.7
通讯作者：
Schoelkopf, R. J.
中科院分区：
文献类型：
--
作者：
Schreier, J. A.;Houck, A. A.;Schoelkopf, R. J.
我们提出了跨量子比特的实验实现，这是一种改进的超导电荷量子比特，源于库珀对盒。我们通过实验验证了预测的对1/f电荷噪声灵敏度的指数抑制。这消除了电荷量子位元退相的主要来源，这会导致均匀展宽的跃迁，弛豫和退相时间在微秒范围内。我们对量子比特谱、非谐性和电荷色散的系统表征与理论符合得很好。
We present an experimental realization of the transmon qubit, which is an improved superconducting charge qubit derived from the Cooper pair box. We experimentally verify the predicted exponential suppression of sensitivity to 1/f charge noise. This removes the leading source of dephasing in charge qubits which results in homogeneously broadened transitions with relaxation and dephasing times in the microsecond range. Our systematic characterization of the qubit spectrum, anharmonicity, and charge dispersion shows excellent agreement with theory.