Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity

TY - JOUR

T1 - Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity

AU - Madsen, K.H.

AU - Ates, S.

AU - Liu, J.

AU - Javadi, Alisa

AU - Albrecht, Sven Marian

AU - Yeo, Inah

AU - Stobbe, Søren

AU - Lodahl, Peter

PY - 2014/10/6

Y1 - 2014/10/6

N2 - We demonstrate a single-photon collection efficiency of (44.3±2.1)% from a quantum dot in a low-Q mode of a photonic-crystal cavity with a single-photon purity of g(2)(0)=(4±5)% recorded above the saturation power. The high efficiency is directly confirmed by detecting up to 962±46 kilocounts per second on a single-photon detector on another quantum dot coupled to the cavity mode. The high collection efficiency is found to be broadband, as is explained by detailed numerical simulations. Cavity-enhanced efficient excitation of quantum dots is obtained through phonon-mediated excitation and under these conditions, single-photon indistinguishability measurements reveal long coherence times reaching 0.77±0.19 ns in a weak-excitation regime. Our work demonstrates that photonic crystals provide a very promising platform for highly integrated generation of coherent single photons including the efficient out-coupling of the photons from the photonic chip.

AB - We demonstrate a single-photon collection efficiency of (44.3±2.1)% from a quantum dot in a low-Q mode of a photonic-crystal cavity with a single-photon purity of g(2)(0)=(4±5)% recorded above the saturation power. The high efficiency is directly confirmed by detecting up to 962±46 kilocounts per second on a single-photon detector on another quantum dot coupled to the cavity mode. The high collection efficiency is found to be broadband, as is explained by detailed numerical simulations. Cavity-enhanced efficient excitation of quantum dots is obtained through phonon-mediated excitation and under these conditions, single-photon indistinguishability measurements reveal long coherence times reaching 0.77±0.19 ns in a weak-excitation regime. Our work demonstrates that photonic crystals provide a very promising platform for highly integrated generation of coherent single photons including the efficient out-coupling of the photons from the photonic chip.

U2 - 10.1103/PhysRevB.90.155303

DO - 10.1103/PhysRevB.90.155303

M3 - Journal article

SN - 2469-9950

VL - 90

JO - Physical Review B

JF - Physical Review B

M1 - 155303

ER -