title: Cavity-enhanced coherent light scattering from a quantum dot.
abstract: 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.
authors.affiliation: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, UK.
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Bennett
authors.affiliation: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, UK.; Department of Engineering, University of Cambridge, 9 J. J. Thomson Avenue, Cambridge CB3 0FA, UK.
authors.forename: James P
authors.identifier: 0000-0001-5653-7331
authors.initials: JP
authors.lastname: Lee
authors.affiliation: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, UK.
authors.forename: David J P
authors.initials: DJ
authors.lastname: Ellis
authors.affiliation: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, UK.
authors.forename: Thomas
authors.identifier: 0000-0002-9055-3893
authors.initials: T
authors.lastname: Meany
authors.affiliation: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, UK.; Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: Eoin
authors.initials: E
authors.lastname: Murray
authors.affiliation: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, UK.; Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: Frederik F
authors.initials: FF
authors.lastname: Floether
authors.affiliation: Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Griffths
authors.affiliation: Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: Ian
authors.identifier: 0000-0002-3033-4306
authors.initials: I
authors.lastname: Farrer
authors.affiliation: Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: David A
authors.initials: DA
authors.lastname: Ritchie
authors.affiliation: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, UK.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Shields
mesh_terms: D003198:Computer Simulation; D008027:Light; D055095:Optics and Photonics / Q000379:methods*; D017785:Photons; D045663:Quantum Dots; D012542:Scattering, Radiation
keywords: Quantum physics; cavity; photon; resonant