Ilya Golokolenov

Performance optimization of cascaded traveling wave Josephson parametric amplifiers

  1. Ilari Lilja,
  2. Ekaterina Mukhanova,
  3. Stanislav Khaldeev,
  4. Ilya Golokolenov,
  5. Visa Vesterinen,
  6. and Pertti Hakonen
Traveling-wave parametric amplifiers (TWPAs) based on Josephson metamaterials provide broadband gain with near-quantum-limited added noise. Whereas long nonlinear metamaterial devices
can deliver high gain, short arrays suffer less from dissipation, pump depletion, and internal standing waves which can degrade noise performance. Here, we demonstrate a cascaded TWPA architecture that combines the advantages of both approaches by employing a short (736-element), low-dissipation Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL)-based TWPA as the first amplification stage, followed by a conventional long (1632-element) TWPA that provides additional gain. The resulting amplifier cascade achieves nearly 30 dB of total gain over a tunable bandwidth of approximately 1 GHz while maintaining added noise close to the quantum limit. Our results establish a cascade of TWPAs as a practical approach for high-gain, broadband, quantum amplification with applications in quantum information processing, multi-mode entanglement, and quantum sensing applications at microwave frequencies.
arxiv pdf

Quantitative calibration of a TWPA applied to an optomechanical platform

  1. Alexandre Delattre,
  2. Ilya Golokolenov,
  3. Richard Pedurand,
  4. Nicolas Roch,
  5. Arpit Ranadive,
  6. Martina Esposito,
  7. Luca Planat,
  8. Andrew Fefferman,
  9. Eddy Collin,
  10. Xin Zhou,
  11. Mika A. Sillanpaa,
  12. Laure Mercier de Lepinay,
  13. Andrew D. Armour,
  14. and Jonas Glatthard
In the last decade, the microwave quantum electronics toolbox has been enriched with quantum limited detection devices such as Traveling Wave Parametric Amplifiers (TWPAs). The extreme
sensitivity they provide is not only mandatory for some physics applications within quantum information processing, but is also the key element that will determine the detection limit of quantum sensing setups. In the framework of microwave optomechanical systems, an unprecedented range of small motions and forces is accessible, for which a specific quantitative calibration becomes necessary. We report on near quantum-limited measurements performed with an aluminum drumhead mechanical device within the temperature range 4 mK – 400 mK. The whole setup is carefully calibrated, especially taking into account the power-dependence of microwave absorption in the superconducting optomechanical cavity. This effect is commonly attributed to Two-Level-Systems (TLSs) present in the metal oxide. We demonstrate that a similar feature exists in the TWPA, and can be phenomenologically fit with adapted expressions. The power and temperature dependence is studied over the full parameter range, leading to an absolute definition of phonon population (i.e. Brownian motion amplitude), with an uncertainty +-20 %.
arxiv pdf