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Second generation readout for large format photon counting microwave kinetic inductance detectors

We present the development of a second generation digital readout system for photon counting microwave kinetic inductance detector (MKID) arrays operating in the optical and near-infrared wavelength bands. Our system retains much of the core signal processing architecture from the first generation s...

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Bibliographic Details
Published in:Review of scientific instruments 2020-12, Vol.91 (12), p.124705-124705
Main Authors: Fruitwala, Neelay, Strader, Paschal, Cancelo, Gustavo, Zmuda, Ted, Treptow, Ken, Wilcer, Neal, Stoughton, Chris, Walter, Alex B., Zobrist, Nicholas, Collura, Giulia, Lipartito, Isabel, Bailey, John I., Mazin, Benjamin A.
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Language:English
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Summary:We present the development of a second generation digital readout system for photon counting microwave kinetic inductance detector (MKID) arrays operating in the optical and near-infrared wavelength bands. Our system retains much of the core signal processing architecture from the first generation system but with a significantly higher bandwidth, enabling the readout of kilopixel MKID arrays. Each set of readout boards is capable of reading out 1024 MKID pixels multiplexed over 2 GHz of bandwidth; two such units can be placed in parallel to read out a full 2048 pixel microwave feedline over a 4 GHz–8 GHz band. As in the first generation readout, our system is capable of identifying, analyzing, and recording photon detection events in real time with a time resolution of order a few microseconds. Here, we describe the hardware and firmware, and present an analysis of the noise properties of the system. We also present a novel algorithm for efficiently suppressing IQ mixer sidebands to below −30 dBc.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0029457