Photonic Implementation of Quantum Information Masking

Masking of quantum information spreads it over nonlocal correlations and hides from the subsystems. It is known that no operation can simultaneously mask all pure states [Phys. Rev. Lett. 120, 230501 (2018)], so in what sense masking useful? Here, we extend definition to general mixed states, show resource maskable far more abundant than no-go theorem seemingly suggests. Geometrically, lays on hyperdisks state hypersphere, strictly contains broadcastable states. We devise a photonic machine using time-correlated photons experimentally investigate properties qubit masking, demonstrate transfer into bipartite its faithful retrieval. The versatile has decent extensibility, may be applicable secret sharing fault-tolerant communication. Our results provide some insights comprehension potential application masking.