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.