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High-gain weakly nonlinear flux-modulated Josephson parametric amplifier using a SQUID array

X. Zhou ; V. Schmitt ; P. Bertet ; D. Vion ; Waltraut Wustmann (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Vitaly Shumeiko (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; D. Esteve
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 89 (2014), 21, p. Article No. 214517.
[Artikel, refereegranskad vetenskaplig]

We have developed and measured a high-gain quantum-limited microwave parametric amplifier based on a superconducting lumped LC resonator with the inductor L including an array of eight superconducting quantum interference devices (SQUIDs). This amplifier is parametrically pumped by modulating the flux threading the SQUIDs at twice the resonator frequency. Around 5 GHz, a maximum gain of 31 dB, a product amplitude gain x bandwidth above 60 MHz, and a 1 dB compression point of -123 dBm at 20 dB gain are obtained in the nondegenerate mode of operation. Phase-sensitive amplification-deamplification is also measured in the degenerate mode and yields a maximum gain of 37 dB. The compression point obtained is 18 dB above what would be obtained with a single SQUID of the same inductance, due to the smaller nonlinearity of the SQUID array.

Nyckelord: quantum, amplification, noise, band



Denna post skapades 2014-11-14. Senast ändrad 2015-01-21.
CPL Pubid: 205780

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Ämnesområden

Fysik

Chalmers infrastruktur