Cryotron

When this device is immersed in a liquid helium bath both wires become superconducting and hence offer no resistance to the passage of electric current.

[3] Juri Matisoo[4] developed a version of the cryotron incorporating a Josephson junction switched by the magnetic field from a control wire.

The circuit was (like the traditional cryotron) capable of some amplification (i.e gain greater than unity) had a switching rate of less than 800 picoseconds.

Although the requirement for cryogenic cooling limited its practicality, it wasn't until the late 2010s that commercial transistors came close to matching this performance.

[citation needed] The Cryotron brought Buck a number of interviews with various news agencies at the time, international scientific renown, and while the work didn't survive Buck's death, many of the techniques for the research of the device would be used at Intel and other chip manufacturers and in the research of other more modern and interactive computers, especially at MIT.