2019
DOI: 10.1038/s41928-019-0300-8
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A superconducting thermal switch with ultrahigh impedance for interfacing superconductors to semiconductors

Abstract: A number of current approaches to quantum and neuromorphic computing use superconductors as the basis of their platform or as a measurement component, and will need to operate at cryogenic temperatures. Semiconductor systems are typically proposed as a top-level control in these architectures, with low-temperature passive components and intermediary superconducting electronics acting as the direct interface to the lowest-temperature stages.The architectures, therefore, require a low-power superconductorsemicon… Show more

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Cited by 81 publications
(61 citation statements)
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“…Detailed measurements indicate that relatively few electrons, injected at energies several orders of magnitude higher than the superconducting gap, trigger the generation of a large number of quasiparticles and weaken superconductivity. This is in stark contrast to previously demonstrated devices actuated by quasiparticle injection at low energy 10 , 15 , 17 , where gate currents comparable to the device critical current (a few μA) were needed for switching. For larger gate currents, injected electrons locally increase temperature and drive the nanowires normal.…”
Section: Introductioncontrasting
confidence: 77%
See 1 more Smart Citation
“…Detailed measurements indicate that relatively few electrons, injected at energies several orders of magnitude higher than the superconducting gap, trigger the generation of a large number of quasiparticles and weaken superconductivity. This is in stark contrast to previously demonstrated devices actuated by quasiparticle injection at low energy 10 , 15 , 17 , where gate currents comparable to the device critical current (a few μA) were needed for switching. For larger gate currents, injected electrons locally increase temperature and drive the nanowires normal.…”
Section: Introductioncontrasting
confidence: 77%
“…Consequently, architectures that do not rely on Josephson junctions are subjected to intense study. Such pioneering approaches are based on three or four terminal devices where electrical currents 13 , locally generated Oersted fields 14 or heat 15 17 drive a superconducting channel normal. Finally, recent experiments suggest that moderate electric fields might affect superconductivity in metallic nanowires 18 , 19 .…”
Section: Introductionmentioning
confidence: 99%
“…With 40 μW electrical power dissipation, our optical readout presents 100x lower heat load than typical readout schemes using a cryogenic amplifier, and is 10x faster than the thermal switch reported by Mccaughan et al 9 . While our demonstration was limited by high optical coupling losses, simple improvements would result in a readout limited only by the internal efficiency of the SNSPD and could reduce the necessary optical power from the 1 mW used in this work to 5 μW (see Supplementary Discussion 4).…”
Section: Discussionmentioning
confidence: 82%
“…"T" is the optical transmitter consisting of a silicon LED. b) Part of a SOEN neuron: a thresholding, amplification, transmission, and detection drive train, adapted from [3]. c) Demonstration of the drive chain in (b).…”
Section: Superconducting Optoelectronic Neural Networkmentioning
confidence: 99%