Josephson voltage standard

{c}
{title2=JVS}
{wiki}

The most practical/precise volt standard.

It motivated the definition of the <ampere in the 2019 redefinition of the SI base units>

Quick <NIST> article about it: https://www.nist.gov/news-events/news/2013/04/primary-voltage-standard-whole-world (https://web.archive.org/web/20190410011041/https://www.nist.gov/news-events/news/2013/04/primary-voltage-standard-whole-world[archive])

The wiki page https://en.wikipedia.org/wiki/Josephson_voltage_standard contains amazing schematics of the device, apparently made by the <US Government>.

\Image[https://upload.wikimedia.org/wikipedia/commons/2/2b/Layout_and_Schematic_of_JVS_Chip.jpg]

\Video[https://www.youtube.com/watch?v=VoRab8U2eS0]
{title=The evolution of voltage metrology to the latest generation of JVSs by Alain Rüfenacht}
{description=Talk given in 2023. The speaker is from <NIST>, and the talk was hosted by the <BIPM>. Fantastic talk.}

\Video[https://www.youtube.com/watch?v=VoRab8U2eS0]
{title=Technical aspects of realizing the DC volt in the laboratory with a JVS by Stéphane Solve}
{description=Talk given in 2023. The speaker is from <BIPM>, and the talk was hosted by the <BIPM>. Fantastic talk.}
