Tech Briefs Magazine - June 2021 - 33

a switch, because when current flows
through the coiled wire, its magnetic
field reduces the current flowing
through the straight wire.
The new device is very much like a cryotron
in that it doesn't require Jo -
sephson junctions. The superconducting
nanowire device - called the nano-cryotron
- uses heat to trigger a switch
rather than a magnetic field. Current
runs through a superconducting, supercooled
wire called the channel. That
channel is intersected by an even smaller
wire called a choke - like a multilane
highway intersected by a side road. When
current is sent through the choke, its
superconductivity breaks down and it
heats up. Once that heat spreads from
the choke to the main channel, it causes
the main channel to also lose its superconducting
state.
Researchers are developing a superconducting nanowire that could enable more efficient superconducting
electronics. (Image: Christine Daniloff, MIT)
tion-based superconductors also may
not interface with conventional electronics
like those in cellphones or computers
- the noise from those swamps
the Josephson junction.
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In 1956, a superconducting computer
switch called the cryotron was developed.
It was little more than two superconducting
wires: One was straight and the other
was coiled around it. The cryotron acts as
The superconducting nanowire could
one day complement, or perhaps compete
with, Josephson junction-based superconducting
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Tech Briefs, June 2021
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Tech Briefs Magazine - June 2021

Table of Contents for the Digital Edition of Tech Briefs Magazine - June 2021

Tech Briefs Magazine - June 2021 - Intro
Tech Briefs Magazine - June 2021 - Sponsor
Tech Briefs Magazine - June 2021 - Band1
Tech Briefs Magazine - June 2021 - Band2
Tech Briefs Magazine - June 2021 - Cov1
Tech Briefs Magazine - June 2021 - Cov2
Tech Briefs Magazine - June 2021 - 1
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Tech Briefs Magazine - June 2021 - Cov3
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Tech Briefs Magazine - June 2021 - MD-Cov1
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Tech Briefs Magazine - June 2021 - ST-Cov1
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Tech Briefs Magazine - June 2021 - ST-1
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