Historical NBS one-volt Josephson array

Documentary micrograph of a historical one-volt Josephson voltage standard with 3,020 junctions. The microwave feed at left connects to four junction chains at right. Reproduced in Figure 1 of NIST Special Publication 958 (2001); the photograph’s capture date is unverified. This is an electrical-metrology chip.

Organization

National Bureau of Standards / NIST

Photograph date

Not supplied by source

Photographer / creator

NBS / NIST

Reuse terms

U.S. federal employee work: public domain in the United States; worldwide royalty-free reuse under NIST technical-publication terms.

NBS / NIST. Figure 1 in A Practical Josephson Voltage Standard at One Volt, NIST Special Publication 958, pp. 315–318. Republished courtesy of the National Institute of Standards and Technology.

Rotated 90 degrees counterclockwise to match the source figure, proportionally resized and converted to WebP by QubitWire on October 17, 2026. Complete embedded micrograph preserved without crop or retouching.