Micro Drum (5915626244)

Multiple versions of NIST's superconducting circuit containing a 'micro drum' were fabricated on this sapphire chip, shown next to a penny for scale. NIST scientists cooled one such drum to the lowest possible energy level, the quantum ground state.
For more information see the NIST Tech Beat story.
See also
www.nist.gov/pml/quantum/drum-tb070611.cfm
Credit: Teufel/NIST
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