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The final state of the qubit in the experiment by Y. Nakamura and others was measured by detecting a tunneling current through an additional probe-junction.
※ Ideally, zero tunneling current implies that the system ended up in the |0〉state, meanwhile if the final state corresponds to an excited state, the maximum current is generated.
In the experiment, the tunneling current shows an oscillating behavior as a function of pulse length.
These data demonstrate the coherent time-evolution of a quantum state in the charge qubit.
