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Absorption of light in superconducting electronics is a major limitation on the quality of circuit architectures that integrate optical components with superconducting components. A 10 nm thick film of a typical superconducting material like niobium can absorb over half of any incident optical radiation. We propose instead using superconductors which are transparent to the wavelengths used elsewhere in the system. In this paper we investigated reduced indium tin oxide (ITO) as a potential transparent superconductor for electronics. We fabricated and characterized superconducting wires of reduced indium tin oxide. We also showed that a 10 nm thick film of the material would only absorb about 1 - 20% of light between 500 - 1700 nm.

Optomechanical systems have applications in nanoscale materials characterization and ultralight dark matter detection. Here we outline a quantum optomechanics readout method based on truncated nonlinear interferometry for sensing below the standard quantum limit.

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