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Based on the Josephson effect. Yet another application of that phenomenal idea!
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Philosophically, this approach is promising because superconductivity is a macroscopic quantum phenomena of Bose Einstein condensation, and so as a macroscopic phenomena, it is easier to control and observe.
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It is fun to see that the representation of information in the QC basically uses an LC circuit, which is a very classical resonator circuit.
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As mentioned at https://en.wikipedia.org/wiki/Superconducting_quantum_computing#Qubit_archetypes there are actually a few different types of superconducting qubits:
  • flux
  • charge
  • phase
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and hybridizations of those such as:
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Input:
  • microwave radiation to excite circuit, or do nothing and wait for it to fall to 0 spontaneously
  • interaction: TODO
  • output: TODO
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Video 173. "Alexandre Blais - Quantum Computing with Superconducting Qubits (Part 1) - CSSQI 2012" by Institute for Quantum Computing (2012) Source. 784s explains why non-linearity is needed: otherwise the input energy would just go to higher and higher levels.
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Video 174. "Quantum Transport, Lecture 16: Superconducting qubits" by Sergey Frolov (2013) Source. 1171s describes several possible realizations: charge, flux, charge/flux and phase.
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Ancestors

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