Real chips have been produced using several alternative computing technologies to silicon.
Notes on verification
Confirmed via multiple independent sources covering distinct alternative chip technologies (GaAs, SiC, carbon nanotube, superconducting circuits), each with credible documentation from academic, industry, and encyclopedic references.
Sources
- Silicon is still King and it is proving difficult to topple it - IEEE Future Directions (cmte.ieee.org)
- https://news.mit.edu/2019/carbon-nanotube-transistor-computer-chip-ibm-analog-devices-0828 (news.mit.edu)
- https://ethw.org/The_GaAs_MESFET:_The_Basis_for_Modern_Wireless_Communications_Systems (ethw.org)