Abstract: To reduce the influence of random channel polarization variation, especially fast polarization perturbation, for continuous-variable quantum key distribution (CV-QKD) systems, a simple and ...

Sarah D. Sparks is a reporter and data journalist for Education Week who covers the teaching profession and pedagogy for Education Week. She has covered education research and the science of learning ...

Tense is the form of a verb which tells you when something happened. Look at the verb ‘talk’ for example. Technically, there are only two grammatical tenses in English: present and past. To talk about ...