Abstract
Low-noise amplification at microwave frequencies has become increasingly important for the research related to superconducting qubits and nanoelectromechanical systems. The fundamental limit of added noise by a phase-preserving amplifier is the standard quantum limit, often expressed as noise temperature \(T_q=\hbar \omega /2k_B\). Towards the goal of the quantum limit, we have developed an amplifier based on intrinsic negative resistance of a selectively damped Josephson junction. Here we present measurement results on previously proposed wide-band microwave amplification and discuss the challenges for improvements on the existing designs. We have also studied flux-pumped metamaterial-based parametric amplifiers, whose operating frequency can be widely tuned by external DC-flux, and demonstrate operation at \(2\omega \) pumping, in contrast to the typical metamaterial amplifiers pumped via signal lines at \(\omega \).
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Notes
This is due to the fact that, within the range of available junction parameters in our fabrication process, the tunability of resonant frequency of a single SQUID resonator would be strongly limited by the necessary, non-ideal tuning capacitance.
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Acknowledgments
Our work was supported in part by the EU 7th Framework Programme (FP7/2007-2013, Grant No. 228464 Microkelvin) and by the Academy of Finland (Projects No. 250280 [LTQ CoE Grant], No. 135908 and No. 263457). This research project made use of the Aalto University Cryohall infrastructure.
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Lähteenmäki, P., Vesterinen, V., Hassel, J. et al. Advanced Concepts in Josephson Junction Reflection Amplifiers. J Low Temp Phys 175, 868–876 (2014). https://doi.org/10.1007/s10909-014-1170-0
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DOI: https://doi.org/10.1007/s10909-014-1170-0