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§ Flux Qubits
As superconductivity is a macroscopically coherent phenomenon ( superconducting phenomena are categorized into macro-quantum phenomena ), macroscopic quantum states in superconductors give a challenging option for quantum computing.
It has been experimentally carried out to demonstrate macro-quantum tunneling ( MQT ) of a superconducting phase in current-biased Josephson junctions and SQUIDs.
