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We theoretically propose an efficient way to generate and detect squeezedlight by a single qubit in circuit QED. By tuning the qubit energy splittingclose to the fundamental frequency of the first harmonic mode (FHM) in atransmission line resonator and placing the qubit at the nodal point of thethird harmonic mode, one can generate the resonantly enhanced squeezing of theFHM upon pumping with the second harmonic mode. In order to investigate thephoton number splitting for the squeezed FHM, we have numerically calculatedthe qubit absorption spectrum, which exhibits regularly spaced peaks atfrequencies separated by twice the effective dispersive shift. It is also shownthat adding a small pump field for the FHM makes additional peaks develop inbetween the dominant ones as well.

Photon Number Splitting of Squeezed Light by a Single Qubit in Circuit QED