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

TY - JOUR

T1 - Efficient fiber-coupled single-photon source based on quantum dots in a photonic-crystal waveguide

AU - Daveau, Raphaël S.

AU - Balram, Krishna C.

AU - Pregnolato, Tommaso

AU - Liu, Jin

AU - Lee, Eun H.

AU - Song, Jin D.

AU - Verma, Varun

AU - Mirin, Richard

AU - Nam, Sae Woo

AU - Midolo, Leonardo

AU - Stobbe, Søren

AU - Srinivasan, Kartik

AU - Lodahl, Peter

PY - 2017/2/20

Y1 - 2017/2/20

N2 - 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) singlephoton 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.

AB - 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) singlephoton 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.

U2 - 10.1364/OPTICA.4.000178

DO - 10.1364/OPTICA.4.000178

M3 - Journal article

C2 - 28584859

AN - SCOPUS:85013343492

SN - 2334-2536

VL - 4

SP - 178

EP - 184

JO - Optica

JF - Optica

IS - 2

ER -