PT - JOURNAL ARTICLE AU - Bennett, Anthony J. AU - Lee, James P. AU - Ellis, David J. P. AU - Meany, Thomas AU - Murray, Eoin AU - Floether, Frederik F. AU - Griffths, Jonathan P. AU - Farrer, Ian AU - Ritchie, David A. AU - Shields, Andrew J. TI - Cavity-enhanced coherent light scattering from a quantum dot AID - 10.1126/sciadv.1501256 DP - 2016 Apr 01 TA - Science Advances PG - e1501256 VI - 2 IP - 4 4099 - http://advances.sciencemag.org/content/2/4/e1501256.short 4100 - http://advances.sciencemag.org/content/2/4/e1501256.full SO - Sci Adv2016 Apr 01; 2 AB - The generation of coherent and indistinguishable single photons is a critical step for photonic quantum technologies in information processing and metrology. A promising system is the resonant optical excitation of solid-state emitters embedded in wavelength-scale three-dimensional cavities. However, the challenge here is to reject the unwanted excitation to a level below the quantum signal. We demonstrate this using coherent photon scattering from a quantum dot in a micropillar. The cavity is shown to enhance the fraction of light that is resonantly scattered toward unity, generating antibunched indistinguishable photons that are 16 times narrower than the time-bandwidth limit, even when the transition is near saturation. Finally, deterministic excitation is used to create two-photon N00N states with which we make superresolving phase measurements in a photonic circuit.