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Superconducting microwave parametric amplifier based on a quasi-fractal slow propagation line

Astghik Adamyan (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; S. E. de Graaf ; Sergey Kubatkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Andrey Danilov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Journal of Applied Physics (0021-8979). Vol. 119 (2016), 8,
[Artikel, refereegranskad vetenskaplig]

Quantum limited amplifiers are sought after for a wide range of applications within quantum technologies and sensing. One promising candidate is the travelling wave parametric amplifier which exploits the non-linear kinetic inductance of a superconducting transmission line. This type of microwave amplifier promises to deliver a high gain, a quantum limited noise performance over several GHz bandwidth, and a high dynamic range. However, practical realizations of this type of device have so far been limited by fabrication defects, since the length of the superconducting transmission line required for achieving substantial parametric gain is on the order of similar to 1m. Here, we report on a design for a microwave traveling wave amplifier based on a slow propagation line comprising a central strip with high kinetic inductance and quasi-fractal line-to-ground capacitors. Due to an enhanced per unit length inductance (73 nH cm(-1)) and capacitance (15 pF cm(-1)), the line has a microwave propagation velocity as low as 9.8 x 10(8) cm s(-1). This translates into parametric gain up to 0.5 dB cm(-1) and a total gain of 6 dB for just a similar to 10 cm long transmission line. Moreover, the flexibility of the presented design allows balancing the line inductance and capacitance in order to keep the characteristic impedance close to 50 Omega and to suppress standing waves, both factors being essential in order to implement a practical parametric amplifier in the microwave domain.

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Denna post skapades 2016-04-06. Senast ändrad 2016-07-05.
CPL Pubid: 234221


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik


Nanovetenskap och nanoteknik

Chalmers infrastruktur

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Slow propagation line-based superconducting devices for quantum technology