Cryotronics is the production of electronics

Electronics

Electronics is the branch of science, engineering and technology that deals with electrical circuits involving active electrical components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies...

 that utilize superconductivity

Superconductivity

Superconductivity is a phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristic temperature. It was discovered by Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum...

, and is not to be confused with cryoelectronics

Cryoelectronics

Cryoelectronics or cryolectronics is the study of superconductivity at low temperatures and its applications. It is not to be confused with cryotronics, the study of the production of superconductor materials....

 or cryolectronics. The simplest use of cryotronics is the cryotron

Cryotron

The cryotron is a switch that operates using superconductivity. The cryotron works on the principle that magnetic fields destroy superconductivity. This simple device consists of two superconducting wires with different critical temperature . A straight wire of tantalum is wrapped around with a...

, which is a switch. Rapid single flux quantum

Rapid single flux quantum

In electronics, rapid single flux quantum is a digital electronics technology that relies on quantum effects in superconducting devices, namely Josephson junctions, to process digital signals. Josephson junctions are the active elements for RSFQ electronics, like transistors are the active...

 digital electronics technology is a good example of cryotronics, as it is based on superconductors. Additionally, the sensitive amplifiers used in radio telescope

Radio telescope

A radio telescope is a form of directional radio antenna used in radio astronomy. The same types of antennas are also used in tracking and collecting data from satellites and space probes...

s are cooled using liquid helium

Liquid helium

Helium exists in liquid form only at extremely low temperatures. The boiling point and critical point depend on the isotope of the helium; see the table below for values. The density of liquid helium-4 at its boiling point and 1 atmosphere is approximately 0.125 g/mL Helium-4 was first liquefied...

 to reduce thermal noise.Cryotronics includes creating,
1.supersensitive miniature receivers for detecting weak radio signals.
2.a crytron switch depends on the effect of inducing persistent current in a closed superconducting circuit for eg.ring