We propose a switchable THz metamaterial that can be switched between two functions of half-wave plate and quarter-wave plate.The two switchable functions can b
Huber et al.[Phys.Rev.Lett.118 (2017) 200502]have proved that a seven-qubit state whose three-body marginal states are all maximally mixed does not exist.Here,w
High-dimensional quantum states key distribution (HD-QKD) can enable more than one bit per photon and tolerate more noise.Recently,a practical HD-QKD system bas
It is known that the p-n junction of an absorption region is a crucial part for power conversion efficiency of photovoltaic power converters.We fabricate four s