Atmospheric turbulance: Random refractive index of the air: modelling using stochastic hydrodynamic methods; Effects: light beam shift due to wavefront distorsion; Attenuations: order of the magnitude in the total effects; How to self-adapt this effect; etc. Miscellaneous scatterings ...
Working principle and experiment setup for PIN based homodyne (heterdyne) detection: Beating for signals; xxx Key techniques of PIN based homodyne (heterdyne) detection: How to select the appropriate PIN diode with completely the same characteristic parameters? xxx Sub-system ...
Working principle of single photon detector using APD: APD working principle; Electric driver for APD based SPD; APD materials (Si, InGaAs/InP, Ge; superductor, etc.) and their characteristics; Key sub-system of APD based SPD: Electric driver; How to choose the APD (diode selection); ...
General principle and schematic experiment setup for coherent laser communication. Key techniques in coherent laser communications: Laser source; PAT; Detection (heterdyne or homodyne detection); Atom filter; Atmosphere.
What are the key theoretical problems? Security proof of coherent state and squeezed state CV protocols for bare CVQKD system: What's the measure of security and so what's the absolute secure case (criterion)? How to provethe absolutesecurity of squeezed state andcoher ...
What are the key theoretical problems? Security proof of BB84 and E91, etc., protocols for bare QKD system: What's the measure of security and so what's the absolute secure case (criterion)? How to provethe absolutesecurity of BB84 and E91 protocol using a general approach? ...
The following is the key for the optical buffer using QCI mechanism: bandwidth-delay-product (BDP): Hence, we need not only more delay, but alsobigger bandwidth of the QCI (EIT, CPO, or whatever) window. how about gaseous medium: too narrow bandwidth but the delay is very go ...
1) Some basics: So far, how many kninds of entanglement are there? I mean, for multipartite entangled states, we know both W state and GHZ state. I just want to know their properties. 2) How to generate photon-photon pair? How many methods are there available so far? At least for SSPDC method, w ...
The following questions are those related to quantum entanglement in my mind: 1) What's the general definition of the measure of entanglement? so, far, we have got to know several items, such as Schmidt number, von Neumann entropy (compare with Shannon entropy), and concurrence. 2) ...
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