Related papers: Double-Pulse Generation of Indistinguishable Single Photons with Optically Controlled Polarization

Double-Pulse Generation of Indistinguishable Single Photons with Optically Controlled Polarization

URL: http://arxiv.org/abs/2109.09279v6
Date: Sun, 13 Feb 2022 07:34:38 GMT
Title: Double-Pulse Generation of Indistinguishable Single Photons with Optically Controlled Polarization
Authors: Junyong Yan, Shunfa Liu, Xing Lin, Yongzheng Ye, Jiawang Yu, Lingfang Wang, Ying Yu, Yanhui Zhao, Yun Meng, Xiaolong Hu, Dawei Wang, Chaoyuan Jin, Feng Liu
Abstract summary: We show a method to generate indistinguishable single photons with optically controlled polarization by two laser pulses off-resonant with neutral exciton states. Our work makes an important step towards indistinguishable single-photon sources with near-unity collection efficiency.
Score: 11.085249064902994
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Single-photon sources play a key role in photonic quantum technologies. Semiconductor quantum dots can emit indistinguishable single photons under resonant excitation. However, the resonance fluorescence technique typically requires cross-polarization filtering which causes a loss of the unpolarized quantum dot emission by 50%. To solve this problem, we demonstrate a method to generate indistinguishable single photons with optically controlled polarization by two laser pulses off-resonant with neutral exciton states. This scheme is realized by exciting the quantum dot to the biexciton state and subsequently driving the quantum dot to an exciton eigenstate. Combining with magnetic field, we demonstrated the generation of photons with optically controlled polarization (polarization degree of 101(2)%), laser-neutral exciton detuning up to 0.81 meV, high single-photon purity (99.6(1)%) and indistinguishability (85(4)%). Laser pulses can be blocked using polarization and spectral filtering. Our work makes an important step towards indistinguishable single-photon sources with near-unity collection efficiency.