In recent experiments on coupled quantum dot (QD) optical cavity systems apronounced interaction between the dot and the cavity has been observed evenfor detunings of many cavity linewidths. This interaction has been attributedto an incoherent phonon-mediated scattering process and is absent in atomicsystems. Here, we demonstrate that despite its incoherent nature, this processpreserves the signatures of coherent interaction between a QD and a strongdriving laser, which may be observed via the optical emission from theoff-resonant cavity. Under bichromatic driving of the QD, the cavity emissionexhibits spectral features consistent with optical dressing of the QDtransition. In addition to revealing new aspects of the off-resonant QD-cavityinteraction, this result provides a new, simpler means of coherently probingQDs than traditional approaches and opens the possibility of employingoff-resonant cavities to optically interface QD-nodes in quantum networks.
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