Journal
APPLIED PHYSICS EXPRESS
Volume 14, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.35848/1882-0786/abf029
Keywords
parametric amplifier; quantum computing; impedance engineering; quantum limited
Categories
Funding
- National Key Research and Development Program of China [2016YFA0301700]
- National Natural Science Foundation of China [61 674 132, 11 674 300, 11 625 419, 11 574 356]
- Strategic Priority Research Program of the CAS [XDB24030601]
- Anhui Initiative in Quantum Information Technologies [AHY080000]
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A broad-band flux-pumped Josephson parametric amplifier with an on-chip coplanar waveguide impedance transformer is proposed for scalable quantum processors. The device achieves an operational bandwidth over 600 MHz with a gain above 15 dB, high saturation power, and quantum-limited noise performance. Additionally, its center frequency can be tuned over several hundred megahertz, broadening the effective operational bandwidth to around 1 GHz.
The rapid progress towards scalable quantum processors demands amplifiers with large bandwidths and high saturation powers. For this purpose, we present a broadband flux-pumped Josephson parametric amplifier integrated with an on-chip coplanar waveguide impedance transformer. Our device can be fabricated with simple and straightforward photo-lithography. This device experimentally achieves an operational bandwidth over 600 MHz with a gain above 15 dB, and a high saturation power with quantum-limited noise performance. In addition, the center frequency of this device can be tuned over several hundred megahertz, which in turn broadens the effective operational bandwidth to around 1 GHz.
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