Efficient demultiplexed single-photon source with a quantum dot coupled to a nanophotonic waveguide

被引:19
|
作者
Hummel, Thomas [1 ]
Ouellet-Plamondon, Clauderic [1 ]
Ugur, Ela [1 ]
Kulkova, Irina [2 ]
Lund-Hansen, Toke [2 ]
Broome, Matthew A. [1 ,3 ]
Uppu, Ravitej [1 ]
Lodahl, Peter [1 ]
机构
[1] Univ Copenhagen, Niels Bohr Inst, Ctr Hybrid Quantum Networks Hy Q, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
[2] Sparrow Quantum, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
[3] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England
基金
新加坡国家研究基金会;
关键词
D O I
10.1063/1.5096979
中图分类号
O59 [应用物理学];
学科分类号
摘要
Planar nanostructures allow near-ideal extraction of emission from a quantum emitter embedded within, thereby realizing deterministic single-photon sources. Such a source can be transformed into M single-photon sources by implementing active temporal-to-spatial mode demultiplexing. We report on the realization of such a demultiplexed source based on a quantum dot embedded in a nanophotonic waveguide. Efficient out-coupling (>60%) from the waveguide into a single mode optical fiber is obtained with high-efficiency grating couplers. As a proof-of-concept, active demultiplexing into M = 4 spatial channels is demonstrated by the use of electro-optic modulators with an end-to-end efficiency of >81% into single-mode fibers. Overall, we demonstrate four-photon coincidence rates of >1Hz even under nonresonant excitation of the quantum dot. The main limitation of the current source is the residual population of other exciton transitions, which corresponds to a finite preparation efficiency of the desired transition. We quantitatively extract a preparation efficiency of 15% using the second-order correlation function measurements. The experiment highlights the applicability of planar nanostructures as efficient multiphoton sources through temporal-to-spatial demultiplexing and lays out a clear path way of how to scale up toward demonstrating quantum advantages with the quantum dot sources. Published under license by AIP Publishing.
引用
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页数:5
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