Fig. 2: Quadrature and power oscillations of emitted radiation from the driven qubit vs pulse length τ. | npj Quantum Information

Fig. 2: Quadrature and power oscillations of emitted radiation from the driven qubit vs pulse length τ.

From: Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source

Fig. 2: Quadrature and power oscillations of emitted radiation from the driven qubit vs pulse length τ.

Red stars represent the measured I quadrature amplitude, while blue stars correspond to the emitted power 〈P〉 = 〈(I2 + Q2)〉. Both traces are fitted to a sinusoid function with an exponential-decay envelope, simultaneously. The extracted decay rate is 2π * 629 kHz. Moreover, the phase of the two fitting curves is offset by π/2, which rules out a coherent state and provides evidence for single-photon emission. The top axis indicates the angle of the qubit-state rotation on the Bloch sphere. The external flux is Φ = 0.

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