  In this work, we demonstrate reconfigurable frequency manipulation of quantum
states of light in the telecom C-band. Triggered single photons are encoded in
a superposition state of three channels using sidebands up to 53 GHz created by
an off-the-shelf phase modulator. The single photons are emitted by an
InAs/GaAs quantum dot grown by metal-organic vapor-phase epitaxy within the
transparency window of the backbone fiber optical network. A cross-correlation
measurement of the sidebands demonstrates the preservation of the single photon
nature; an important prerequisite for future quantum technology applications
using the existing telecommunication fiber network.
