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Coherent quantum oscillations in the time domain have never been detected in SQUID systems ( in 2003 ).
Pulsed microwaves instead of continuous ones must be applied to probe the time e-volution. Observation of such oscillations would imply the demonstration of macro-quantum coherence ( MQC ) since the 1980’s .
The determination of decoherence time is the major remaining task to evaluate the feasibility of this type of flux qubits for practical quantum computing.
