TY - JOUR

T1 - Photoneutralization of charges in GaAs quantum dot based entangled photon emitters

AU - Yang, Jingzhong

AU - Fandrich, Tom

AU - Benthin, Frederik

AU - Keil, Robert

AU - Sharma, Nand Lal

AU - Nie, Weijie

AU - Hopfmann, Caspar

AU - Schmidt, Oliver G.

AU - Zopf, Michael

AU - Ding, Fei

N1 - Funding Information: The authors thank X. Cao for fruitful discussion and gratefully acknowledge the funding by the German Federal Ministry of Education and Research (BMBF) within the project Q.Link.X (16KIS0869) and QR.X (16KISQ015), the European Research Council (QD-NOMS GA715770) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy (EXC-2123) QuantumFrontiers (390837967).

PY - 2022/3/3

Y1 - 2022/3/3

N2 - Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent of photonic quantum technologies. They are known for the ability to generate discrete photonic states on-demand with low multiphoton emission, near-unity entanglement fidelity, and high single photon indistinguishability. However, quantum dots typically suffer from luminescence blinking, lowering the efficiency of the source and hampering their scalable application in quantum networks. In this paper, we investigate and adjust the intermittence of the neutral exciton emission in a GaAs/AlGaAs quantum dot under two-photon resonant excitation of the neutral biexciton. We investigate the spectral and quantum optical response of the quantum dot emission to an additional wavelength tunable gate laser, revealing blinking caused by the intrinsic Coulomb blockade due to charge capture processes. Our finding demonstrates that the emission quenching can be actively suppressed by controlling the balance of free electrons and holes in the vicinity of the quantum dot and thereby significantly increasing the quantum efficiency by 30%.

AB - Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent of photonic quantum technologies. They are known for the ability to generate discrete photonic states on-demand with low multiphoton emission, near-unity entanglement fidelity, and high single photon indistinguishability. However, quantum dots typically suffer from luminescence blinking, lowering the efficiency of the source and hampering their scalable application in quantum networks. In this paper, we investigate and adjust the intermittence of the neutral exciton emission in a GaAs/AlGaAs quantum dot under two-photon resonant excitation of the neutral biexciton. We investigate the spectral and quantum optical response of the quantum dot emission to an additional wavelength tunable gate laser, revealing blinking caused by the intrinsic Coulomb blockade due to charge capture processes. Our finding demonstrates that the emission quenching can be actively suppressed by controlling the balance of free electrons and holes in the vicinity of the quantum dot and thereby significantly increasing the quantum efficiency by 30%.

KW - quant-ph

KW - cond-mat.mtrl-sci

KW - physics.optics

UR - http://www.scopus.com/inward/record.url?scp=85126466523&partnerID=8YFLogxK

U2 - 10.48550/arXiv.2110.02346

DO - 10.48550/arXiv.2110.02346

M3 - Article

VL - 105

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 11

M1 - 115301

ER -