Efficient fiber-coupled single-photon source based on quantum dots in a photonic-crystal waveguide

Title
Efficient fiber-coupled single-photon source based on quantum dots in a photonic-crystal waveguide
Authors
송진동RAPHAEL S. DAVEAUKRISHNA C. BALRAMTOMMASO PREGNOLATOJIN LIUEUN H. LEEVARUN VERMARICHARD MIRINSAE WOO NAMLEONARDO MIDOLOSØREN STOBBEKARTIK SRINIVASANPETER LODAHL
Keywords
single photon source; photnic crystal; qunatum dot
Issue Date
2017-02
Publisher
Optica
Citation
VOL 4, NO 2-184
Abstract
Many photonic quantum information processing applications would benefit from a high brightness, fiber-coupled source of triggered single photons. Here, we present a fiber-coupled photonic-crystal waveguide (PCWG) single-photon source relying on evanescent coupling of the light field from a tapered outcoupler to an optical fiber. A two-step approach is taken where the performance of the tapered outcoupler is recorded first on an independent device containing an on-chip reflector. Reflection measurements establish that the chip-to-fiber coupling efficiency exceeds 80%. The detailed characterization of a high-efficiency PCWG extended with a tapered outcoupling section is then performed. The corresponding overall single-photon source efficiency is 10.9% +/- 2.3%, which quantifies the success probability to prepare an exciton in the quantum dot, couple it out as a photon in the waveguide, and subsequently transfer it to the fiber. The applied outcoupling method is robust, stable over time, and broadband over several tens of nanometers, which makes it a highly promising pathway to increase the efficiency and reliability of planar chip-based single-photon sources.
URI
http://pubs.kist.re.kr/handle/201004/66437
ISSN
2334-2536
Appears in Collections:
KIST Publication > Article
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