  We study the slowing, storing and releasing of microwave pulses in a
superconducting circuits composed of two coplanar waveguide resonators and a
superconducting transmon-type qubit. The quantum interference analogy to
electromagnetically induced transparency is created in two coupled resonators.
By tuning the resonance frequency of the transmon, we dynamically tune the
effective coupling between the resonators. Via the modulation of the coupling,
we show the tunable true time delay of microwave pulses at the single-photon
level. We also store the microwave field in a high-Q resonator and release the
signal from it to the output port. Our scheme promises applications in both
quantum information processing and classical wireless communications.
