Artistic impression of the sample, the pulse sequence, and the density matrix. Credit: Image by Antti Paraoanu
A superconducting qubit is an artificial atom fabricated on a silicon chip as an electrical circuit made of capacitors and tunnel junctions. This technology is one of the most promising for the realization of quantum computers.
In the experiment, the circuit was operated in a regime where it no longer absorbs or emits electromagnetic waves of certain frequency, as if it would be hiding under an invisibility cloak – hence the term “dark state.” Then, by using a sequence of microwave pulses, the team employed the dark state to realize a transfer of population from the ground energy level to the second energy level, without populating the first energy level...
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