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Demonstration of a Multiplexer of Dissipationless SQUIDs}



John Mates, Gene C. Hilton, Kent D. Irwin, Leila R. Vale, Konrad Lehnert


We report on the development of a microwave SQUID multiplexer for reading out arrays of low-temperature detectors. In this frequency-division multiplexer, each SQUID couples to a high-Q superconducting resonator so that flux through the SQUID shifts the resonant frequency. The multiplexer consists of multiple SQUIDs coupled to resonators of different resonant frequencies, all coupled to a common transmission line. We demonstrate multiple designs, with high $Q$ values (4,100-17,000), noise as low as 0.17$\mu\Phi_0}/\sqrt\mathrmHz}}$, power dissipation as low as 5pW per resonator, and a naturally linear readout scheme based on flux modulation. This multiplexing approach is compatible with existing low-temperature detectors such as superconducting transition-edge sensor (TES) detectors and magnetic calorimeters, and is capable of multiplexing thousands of detectors in a single channel.
Applied Physics Letters


SQUIDs, multiplexer


Mates, J. , Hilton, G. , Irwin, K. , Vale, L. and Lehnert, K. (2008), Demonstration of a Multiplexer of Dissipationless SQUIDs}, Applied Physics Letters, [online], (Accessed February 20, 2024)
Created January 17, 2008, Updated October 12, 2021