A superconducting thermal switch with ultrahigh impedance for interfacing superconductors to semiconductors
Adam N. McCaughan, Varun B. Verma, Sonia M. Buckley, Alexander N. Tait, Sae Woo Nam, Jeffrey M. Shainline
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 superconductorsemiconductor interface, which is not currently available. Here we report a superconducting switch that is capable of translating low-voltage superconducting inputs directly into semiconductor-compatible (above 1,000 mV) outputs at kelvin-scale temperatures (1K or 4K). To illustrate the capabilities in interfacing superconductors and semiconductors, we use it to drive a light-emitting diode (LED) in a photonic integrated circuit, generating photons at 1\,K from a low-voltage input and detecting them with an on-chip superconducting single-photon detector. We also characterize our devices timing response (less than 300 ps turn-on, 15 ns turn-off), output impedance (greater than 1Ω), and energy requirements (0.18fJ/um^2, 3.24 mV/nW).
, Verma, V.
, Buckley, S.
, Tait, A.
, , S.
and Shainline, J.
A superconducting thermal switch with ultrahigh impedance for interfacing superconductors to semiconductors, Nature Electronics, [online], https://doi.org/10.1063/1.5096403
(Accessed May 16, 2021)