Fiber-Coupled Cavity-QED Source of Identical Single Photons

Letter

Fiber-Coupled Cavity-QED Source of Identical Single Photons

H. Snijders, J. A. Frey, J. Norman, V. P. Post, A. C. Gossard, J. E. Bowers, M. P. van Exter, W. Löffler, and D. Bouwmeester

Phys. Rev. Applied 9, 031002 – Published 28 March 2018

Abstract

We present a fully fiber-coupled source of high-fidelity single photons. An (In,Ga)As semiconductor quantum dot is embedded in an optical Fabry-Perot microcavity with a robust design and rigidly attached single-mode fibers, which enables through-fiber cross-polarized resonant laser excitation and photon extraction. Even without spectral filtering, we observe that the incident coherent light pulses are transformed into a stream of single photons with high purity (97%) and indistinguishability (90%), which is measured at an in-fiber brightness of 5% with an excellent cavity-mode-to-fiber coupling efficiency of 85%. Our results pave the way for fully fiber-integrated photonic quantum networks. Furthermore, our method is equally applicable to fiber-coupled solid-state cavity-QED-based photonic quantum gates.

Received 17 October 2017
Revised 10 January 2018

DOI:https://doi.org/10.1103/PhysRevApplied.9.031002

Physics Subject Headings (PhySH)

Atoms, ions, & molecules in cavities Cavity quantum electrodynamics Optical quantum information processing Quantum networks Single photon sources

III-V semiconductors Optical fibers Quantum dots

Quantum Information, Science & TechnologyAtomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Snijders¹, J. A. Frey², J. Norman³, V. P. Post¹, A. C. Gossard³, J. E. Bowers³, M. P. van Exter¹, W. Löffler^1,*, and D. Bouwmeester^1,2

¹Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
²Department of Physics, University of California, Santa Barbara, California 93106, USA
³Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA