Frequency modulated laser beam with highly efficient intensity stabilisation

Superbunching pseudothermal light with intensity modulated laser light and rotating groundglass

Pseudothermal light by scattering laser light from rotating groundglass has been extensively employed to study optical coherence in both classical and quantum optics ever since its invention in 1960s. In this paper, we will show that by replacing the invariant intensity laser light in pseudothermal light source with intensity modulated laser light, superbunching pseudothermal light can be obtained. Two-photon interference in Feynman's path integral theory is employed to interpret the phenomenon. Two-photon superbunching is experimentally observed by employing common instruments in optical labo…

利用带有随机波动的改进本振光强度攻击对离散调制连续变量量子密钥分发的量子黑客攻击

Quantum hacking against discrete-modulated continuous-variable quantum key distribution using modified local oscillator intensity attack with random fluctuations

本文提出了一种针对离散调制连续变量量子密钥分发的隐蔽量子黑客攻击，窃听者通过模拟本振光强度的随机波动，干扰参数估计并导致通信双方高估密钥率，该攻击仅能通过实时高精度监测消除，且适用于本地本振光系统。

用于无调制器诱骗态量子密钥分发的简化强度与相位调制发射机

Simplified intensity- and phase-modulated transmitter for modulator-free decoy-state quantum key distribution

提出一种无需体调制器的新型光发射机设计，通过直接调制激光器结合光注入锁定与相干干涉生成GHz级强度和相位可调脉冲，实现诱骗态QKD，具有低成本、紧凑及易于光子集成的优势。

A direct GHz-clocked phase and intensity modulated transmitter applied to quantum key distribution

Quantum key distribution (QKD), a technology that enables perfectly secure communication, has evolved to the stage where many different protocols are being used in real-world implementations. Each protocol has its own advantages, meaning that users can choose the one best-suited to their application, however each often requires different hardware. This complicates multi-user networks, in which users may need multiple transmitters to communicate with one another. Here, we demonstrate a direct-modulation based transmitter that can be used to implement most weak coherent pulse based QKD protocols…

A modulated mirror for atomic interferometry

A novel atomic beam splitter, using reflection of atoms off an evanescent light wave, is investigated theoretically. The intensity or frequency of the light is modulated in order to create sidebands on the reflected de Broglie wave. The weights and phases of the various sidebands are calculated using three different approaches: the Born approximation, a semiclassical path integral approach, and a numerical solution of the time-dependent Schrödinger equation. We show how this modulated mirror could be used to build practical atomic interferometers.

Dynamical Casimir Effect in Optically Modulated Cavities

Cavities with periodically oscillating mirrors have been predicted to excite photon pairs out of the quantum vacuum in a process known as the Dynamical Casimir effect. Here we propose and analyse an experimental layout that can provide an efficient modulation of the effective optical length of a cavity mode in the near-infrared spectral region. An analytical model of the dynamical Casimir emission is developed and compared to the predictions of a direct numerical solution of Maxwell's equations in real time. A sizeable intensity of dynamical Casimir emission is anticipated for realistic operat…