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DTSTART:20260329T030000
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DTSTAMP:20260312T163816Z
UID:68c18b9d9c36c604739961@ist.ac.at
DTSTART:20251104T110000
DTEND:20251104T120000
DESCRIPTION:Speaker: Nicolas Zapata\nhosted by Johannes Fink\nAbstract: Sup
 erconducting-based parametric amplifiers have become essentialcomponents f
 or the detection and readout of microwave quantum circuits. Amongtheir dif
 ferent implementations\, standing-wave amplifiers are particularlyattracti
 ve due to their ability to deliver high gain and quantum-limited noiseperf
 ormance with flexible engineering and fabrication. However\, their operati
 onnear an instability point imposes a fundamental constraint: the instanta
 neousbandwidth decreases with increasing amplifier gain\, a trade-off comm
 only knownas the gainbandwidth limit. One approach to mitigate this limita
 tion consists ofimpedance engineering\, which enables a tenfold bandwidth 
 increase at the 20dB gain levels typically required in quantum measurement
 s [1]. In this work\, weimplement a complementary approach based on two si
 multaneous parametricdrives that activate phase-preserving gain and freque
 ncy-conversion processes\,enabling parametric amplification without instab
 ility [2]. Realized in a granularaluminum Bose-Hubbard dimer [3]\, this me
 thod achieves a fivefold bandwidthenhancement at 20 dB gain\, surpasses th
 e conventional gainbandwidth limit upto 25 dB\, and maintains near-quantum
 -limited performance.[1] O. Naaman. & J. Aumentado\, PRX Quantum 3\, 02020
 1 (2022).[2] A. Metelmann. et al.\, arXiv 2208.00024 (2022).[3] N. Zapata.
  et al.\, Phys. Rev. Lett. 133\, 262604 (2024).
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Nicolas Zapata: Granular Aluminum Parametric Amplifier beyond the g
 ain- bandwidth limit
URL:https://talks-calendar.ista.ac.at/events/6008
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