Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides

Chris Lennart Dreessen; Claudéric Ouellet-Plamondon; Petru Tighineanu; Xiaoyan Zhou; Leonardo Midolo; Anders Søndberg Sørensen; Peter Lodahl

doi:10.1088/2058-9565/aadbb8

Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides

Chris Lennart Dreessen, Claudéric Ouellet-Plamondon, Petru Tighineanu, Xiaoyan Zhou, Leonardo Midolo, Anders Søndberg Sørensen, Peter Lodahl

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5 Citations (Scopus)

Abstract

The fundamental process limiting the coherence of quantum-dot based single-photon sources is the interaction with phonons. We study theoretically the effect of phonon decoherence on the indistinguishability of single photons emitted from a quantum dot embedded in a suspended nanobeam waveguide. At low temperatures, the indistinguishability is limited by the coupling between the quantum dot and the fundamental vibrational modes of the waveguide and is sensitive to the quantum-dot position within the nanobeam cross-section. We show that this decoherence channel can be efficiently suppressed by clamping the waveguide with a low refractive index cladding material deposited on the waveguide. With only a few microns of cladding material, the coherence of the emitted single photons is drastically improved. We show that the degree of indistinguishability can reach near unity and become independent of the quantum-dot position. We finally show that the cladding material may serve dual purposes since it can also be applied as a means to efficiently outcouple single photons from the nanophotonic waveguide into an optical fiber. Our proposal paves the way for a highly efficient fiber-coupled source of indistinguishable single photons based on a planar nanophotonic platform.

Original language	English
Article number	015003
Journal	Quantum Science and Technology
Volume	4
Number of pages	12
ISSN	2058-9565
DOIs	https://doi.org/10.1088/2058-9565/aadbb8
Publication status	Published - Jan 2019

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title = "Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides",

abstract = "The fundamental process limiting the coherence of quantum-dot based single-photon sources is the interaction with phonons. We study theoretically the effect of phonon decoherence on the indistinguishability of single photons emitted from a quantum dot embedded in a suspended nanobeam waveguide. At low temperatures, the indistinguishability is limited by the coupling between the quantum dot and the fundamental vibrational modes of the waveguide and is sensitive to the quantum-dot position within the nanobeam cross-section. We show that this decoherence channel can be efficiently suppressed by clamping the waveguide with a low refractive index cladding material deposited on the waveguide. With only a few microns of cladding material, the coherence of the emitted single photons is drastically improved. We show that the degree of indistinguishability can reach near unity and become independent of the quantum-dot position. We finally show that the cladding material may serve dual purposes since it can also be applied as a means to efficiently outcouple single photons from the nanophotonic waveguide into an optical fiber. Our proposal paves the way for a highly efficient fiber-coupled source of indistinguishable single photons based on a planar nanophotonic platform.",

author = "Dreessen, {Chris Lennart} and Claud{\'e}ric Ouellet-Plamondon and Petru Tighineanu and Xiaoyan Zhou and Leonardo Midolo and S{\o}rensen, {Anders S{\o}ndberg} and Peter Lodahl",

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T1 - Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides

AU - Dreessen, Chris Lennart

AU - Ouellet-Plamondon, Claudéric

AU - Tighineanu, Petru

AU - Zhou, Xiaoyan

AU - Midolo, Leonardo

AU - Sørensen, Anders Søndberg

AU - Lodahl, Peter

PY - 2019/1

Y1 - 2019/1

N2 - The fundamental process limiting the coherence of quantum-dot based single-photon sources is the interaction with phonons. We study theoretically the effect of phonon decoherence on the indistinguishability of single photons emitted from a quantum dot embedded in a suspended nanobeam waveguide. At low temperatures, the indistinguishability is limited by the coupling between the quantum dot and the fundamental vibrational modes of the waveguide and is sensitive to the quantum-dot position within the nanobeam cross-section. We show that this decoherence channel can be efficiently suppressed by clamping the waveguide with a low refractive index cladding material deposited on the waveguide. With only a few microns of cladding material, the coherence of the emitted single photons is drastically improved. We show that the degree of indistinguishability can reach near unity and become independent of the quantum-dot position. We finally show that the cladding material may serve dual purposes since it can also be applied as a means to efficiently outcouple single photons from the nanophotonic waveguide into an optical fiber. Our proposal paves the way for a highly efficient fiber-coupled source of indistinguishable single photons based on a planar nanophotonic platform.

AB - The fundamental process limiting the coherence of quantum-dot based single-photon sources is the interaction with phonons. We study theoretically the effect of phonon decoherence on the indistinguishability of single photons emitted from a quantum dot embedded in a suspended nanobeam waveguide. At low temperatures, the indistinguishability is limited by the coupling between the quantum dot and the fundamental vibrational modes of the waveguide and is sensitive to the quantum-dot position within the nanobeam cross-section. We show that this decoherence channel can be efficiently suppressed by clamping the waveguide with a low refractive index cladding material deposited on the waveguide. With only a few microns of cladding material, the coherence of the emitted single photons is drastically improved. We show that the degree of indistinguishability can reach near unity and become independent of the quantum-dot position. We finally show that the cladding material may serve dual purposes since it can also be applied as a means to efficiently outcouple single photons from the nanophotonic waveguide into an optical fiber. Our proposal paves the way for a highly efficient fiber-coupled source of indistinguishable single photons based on a planar nanophotonic platform.

U2 - 10.1088/2058-9565/aadbb8

DO - 10.1088/2058-9565/aadbb8

M3 - Journal article

SN - 2058-9565

VL - 4

JO - Quantum Science and Technology

JF - Quantum Science and Technology

M1 - 015003

ER -

Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides

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