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We investigate the properties of a single photon generated by a solid-state emitter subject to strong pure dephasing. We employ a model in which all the elements of the system, including the propagating fields, are treated quantum mechanically. We analytically derive the density matrix of the emitted photon, which contains full information about the photon, such as its pulse profile, power spectrum, and purity. We visualize these analytical results using realistic parameters and reveal the conditions for maximizing the purity of generated photons.

It is revealed that quadrature squeezing occurs in the output field from a one-dimensional atom driven by a classical field. The degree of squeezing depends on the intensity of the input field, and reaches 28% at the maximum. It can roughly be regarded that the output field is in a superposition of coherent and number states.