Intrinsically narrowband pair photon generation in microstructured fibres

Squeezed light from microstructured fibres: towards free space quantum cryptography

Amplitude squeezed pulsed light has been produced using a microstructured silica fibre. By spectrally filtering after the nonlinear propagation in the fibre a squeezing value of -1.7dB has been measured. A quantum key distribution scheme based on squeezed light from such microstructured fibres is proposed.

Photon pair generation using four-wave mixing in a microstructured fibre: theory versus experiment

We develop a theoretical analysis of four-wave mixing used to generate photon pairs useful for quantum information processing. The analysis applies to a single mode microstructured fibre pumped by an ultra-short coherent pulse in the normal dispersion region. Given the values of the optical propagation constant inside the fibre, we can estimate the created number of photon pairs per pulse, their central wavelength and their respective bandwidth. We use the experimental results from a picosecond source of correlated photon pairs using a micro-structured fibre to validate the model. The fibre is…

用于量子应用的微结构光纤：展望

Microstructured optical fibres for quantum applications: perspective

本文综述了微结构光纤在量子技术中的最新进展，指出实心和空芯光纤的光学非线性可用于量子资源态生成与频率转换，且空芯光纤凭借低损耗、低延迟和低色散在量子网络链路及原子实验中具有巨大潜力。

Nonclassical 2-photon interference with separate intrinsically narrowband fibre sources

In this paper, we demonstrate a source of photon pairs based on four-wave-mixing in photonic crystal fibres. Careful engineering of the phase matching conditions in the fibres enables us to create photon pairs at 597 nm and 860 nm in an intrinsically factorable state showing no spectral correlations. This allows for heralding one photon in a pure state and hence renders narrow band filtering obsolete. The source is narrow band, bright and achieves an overall detection efficiency of up to 21% per photon. For the first time, a Hong-Ou-Mandel interference with unfiltered photons from separate fib…

用于量子中继器的集成窄带光子源实现纠缠交换

Entanglement Swapping with Integrated Narrowband Photon Sources for Quantum Repeaters

本研究采用与多原子量子存储平台兼容的集成窄带光子源，实现了高可见度的纠缠交换，完成了覆盖1.6 THz的系统级稳定，为现场部署量子中继器解决了关键技术挑战。

Giant Narrowband Twin-Beam Generation along the Pump Energy Propagation

Walk-off effects, originating from the difference between the group and phase velocities, limit the efficiency of nonlinear optical interactions. While transverse walk-off can be eliminated by proper medium engineering, longitudinal walk-off is harder to avoid. In particular, ultrafast twin- beam generation via pulsed parametric down-conversion (PDC) and four-wave mixing (FWM) is only possible in short crystals or fibres or in double-path schemes. Here we show that in high-gain PDC, one can overcome the destructive role of both effects and even turn them into useful tools for shaping the emiss…