Sequential Dispersive Measurement of a Superconducting Qubit

被引：14
|
作者：
Peronnin, T. [1 ]
Markovic, D. [2 ]
Ficheux, Q. [1 ]
Huard, B. [1 ]
机构：
[1] Univ Claude Bernard Lyon 1, Lab Phys, CNRS, ENS Lyon,Univ Lyon, Lyon 69342, France
[2] Univ Paris Saclay, Univ Paris Sud, Unite Mixte Phys, CNRS, Palaiseau 91767, France
来源：
PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 18期
关键词：
QUANTUM TRAJECTORIES; DYNAMICS;
D O I：
10.1103/PhysRevLett.124.180502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present a superconducting device that realizes the sequential measurement of a transmon qubit. The device disables common limitations of dispersive readout such as Purcell effect or transients in the cavity mode by turning on and off the coupling to the measurement channel on demand. The qubit measurement begins by loading a readout resonator that is coupled to the qubit. After an optimal interaction time with negligible loss, a microwave pump releases the content of the readout mode by upconversion into a measurement line in a characteristic time as low as 10 ns, which is 400 times shorter than the lifetime of the readout resonator. A direct measurement of the released field quadratures demonstrates a readout fidelity of 97.5% in a total measurement time of 220 ns. The Wigner tomography of the readout mode allows us to characterize the non-Gaussian nature of the readout mode and its dynamics.
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页数：6
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