Sbresny Friedrich, Hanschke Lukas, Schöll Eva, Rauhaus William, Scaparra Bianca, Boos Katarina, Zubizarreta Casalengua Eduardo, Riedl Hubert, Del Valle Elena, Finley Jonathan J, Jöns Klaus D, Müller Kai
Walter Schottky Institut, Department of Electrical and Computer Engineering and MCQST, Technische Universität München, 85748 Garching, Germany.
Institute for Photonic Quantum Systems (PhoQS), Center for Optoelectronics and Photonics Paderborn (CeOPP) and Department of Physics, Paderborn University, 33098 Paderborn, Germany.
Phys Rev Lett. 2022 Mar 4;128(9):093603. doi: 10.1103/PhysRevLett.128.093603.
We propose a scheme for the generation of highly indistinguishable single photons using semiconductor quantum dots and demonstrate its performance and potential. The scheme is based on the resonant two-photon excitation of the biexciton followed by stimulation of the biexciton to selectively prepare an exciton. Quantum-optical simulations and experiments are in good agreement and show that the scheme provides significant advantages over previously demonstrated excitation methods. The two-photon excitation of the biexciton suppresses re-excitation and enables ultralow multiphoton errors, while the precisely timed stimulation pulse results in very low timing jitter of the photons, and consequently, high indistinguishability. In addition, the polarization of the stimulation pulse allows us to deterministically program the polarization of the emitted photon (H or V). This ensures that all emission of interest occurs in the polarization of the detection channel, resulting in higher brightness than cross-polarized resonant excitation.
我们提出了一种利用半导体量子点产生高度不可区分单光子的方案，并展示了其性能和潜力。该方案基于双激子的共振双光子激发，随后对双激子进行激发以选择性地制备一个激子。量子光学模拟和实验结果吻合良好，表明该方案相对于先前展示的激发方法具有显著优势。双激子的双光子激发抑制了再激发，并实现了超低的多光子误差，而精确计时的激发脉冲导致光子的定时抖动非常低，从而具有高不可区分性。此外，激发脉冲的偏振使我们能够确定性地设定发射光子的偏振（水平或垂直）。这确保了所有感兴趣的发射都发生在检测通道的偏振方向上，从而比交叉偏振共振激发具有更高的亮度。
