Generation and efficient measurement of single photons from fixed-frequency superconducting qubits

被引：26
作者：
Kindel, William F. [1 ,2 ,3 ]
Schroer, M. D. [4 ]
Lehnert, K. W. [1 ,2 ,3 ,5 ]
机构：
[1] Univ Colorado, JILA, Boulder, CO 80309 USA
[2] NIST, Boulder, CO 80309 USA
[3] Univ Colorado, Dept Phys, Boulder, CO 80309 USA
[4] GE Aviat, Cincinnati, OH 45215 USA
[5] NIST, Boulder, CO 80305 USA
来源：
PHYSICAL REVIEW A | 2016年 / 93卷 / 03期
基金：
美国国家科学基金会;
关键词：
MICROWAVE FIELDS; QUANTUM; CIRCUITS;
D O I：
10.1103/PhysRevA.93.033817
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We demonstrate and evaluate an on-demand source of single itinerant microwave photons. Photons are generated using a highly coherent, fixed-frequency qubit-cavity system, and a protocol where the microwave control field is far detuned from the photon emission frequency. By using a Josephson parametric amplifier (JPA), we perform efficient single-quadrature detection of the state emerging from the cavity. We characterize the imperfections of the photon generation and detection, including detection inefficiency and state infidelity caused by measurement back-action over a range of JPA gains from 17 to 33 dB. We observe that both detection efficiency and undesirable back-action increase with JPA gain. We find that the density matrix has its maximum single-photon component rho(11) = 0.36 +/- 0.01 at 29 dB JPA gain. At this gain, back-action of the JPA creates cavity photon number fluctuations that we model as a thermal distribution with an average photon number (n) over bar = 0.041 +/- 0.003.
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页数：8
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