Post-selective two-photon interference from a continuous non-classical stream of photons emitted by a quantum dot

Polarization properties of single photons emitted by nitrogen-vacancy defect in diamond at low temperature

In this report, the polarization properties of the photoluminescence emitted by single nitrogen-vacancy (NV) color centers in diamond are investigated using resonant excitation at cryogenic temperature. We first underline that the two excited-state orbital branches are associated with two orthogonal transition dipoles. Using selective excitation of one dipole, we then show that the photoluminescence is partially unpolarized owing to fast relaxation between the two orbitals induced by the thermal bath. This result might be important in the context of the realization of indistinguishable single …

单光子发射体多光子事件的选择性滤波

Selective filtering of multi-photon events from a single-photon emitter

该研究针对单光子源纯度受自发辐射和再激发限制的问题，利用多光子错误的光谱-时间特性，通过窄带光谱滤波将零延迟二阶相干度降低近一个数量级，在不影响目标单光子发射的前提下显著抑制多光子错误率。

用于类注意力选择性再现的量子储备池计算

Quantum Reservoir Computing for Attention-like Selective Reproduction

该研究针对量子储备池计算（QRC）提出类注意力选择性再现任务，通过模拟自旋储备池实验验证其可准确选择并再现被提示输入流，为复杂认知任务研究提供了起点。

A non-Markovian optical signature for detecting entanglement in coupled excitonic qubits

We identify an optical signature for detecting entanglement in experimental nanostructure systems comprising coupled excitonic qubits. This signature owes its strength to non-Markovian dynamical effects in the second-order temporal coherence function of the emitted radiation. We calculate autocorrelation and cross-correlation functions for both selective and collective light excitation, and prove that the coherence properties of the emitted light do indeed carry information about the entanglement of the initial multi-qubit state. We also show that this signature can survive in the presence of …

中性及带电激子在偏振选择性腔体中单光子发射的理论

Theory of single-photon emission from neutral and charged excitons in a polarization-selective cavity

研究中性及带电激子在偏振选择性腔体中单光子发射的量子动力学，提出优化态初始化配置，实现近100%偏振效率，推导出光子输出与 Purcell 增强发射率的关系公式。

Atomic Clouds as Spectrally-Selective and Tunable Delay Lines for Single Photons from Quantum Dots

We demonstrate a compact, spectrally-selective, and tunable delay line for single photons emitted by quantum dots. This is achieved by fine-tuning the wavelength of the optical transitions of such "artificial atoms" into a spectral window in which a cloud of natural atoms behaves as slow-light medium. By employing the ground-state fine-structure-split exciton confined in an InGaAs/GaAs quantum dot as a source of single photons at different frequencies and the hyperfine-structure-split $D_1$ transition of Cs-vapors as a tunable delay-medium, we achieve a differential delay of up 2.4 ns on a 7.5…