Entanglement distribution maximization over one-side Gaussian noisy channel

The optimization of entanglement evolution for two-mode Gaussian pure states under one-side Gaussian map is studied. Even there isn't complete information about the one-side Gaussian noisy channel, one can still maximize the entanglement distribution by testing the channel with only two specific states

2-Nitro-N-(4-pyridinio)benzene­sulfonamidate monohydrate

The title compound, C11H9N3O4S·H2O, contains both an acid and a base centre and displays a zwitterionic structure. There are two independent mol­ecules and two water mol­ecules in the asymmetric unit. The dihedral angles between the benzene ring and the pyridinium ring are 109.7 (1) and 110.7 (1)°. The dihedral angles between the nitro group and the benzene ring are 116.1 (2) and 116.7 (1)°. The crystal structure is stabilized by N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds

4-(4-Nitro­benzene­sulfonamido)pyridinium nitrate

A short C—N distance [1.394 (2) Å] in the title compound, C11H10N3O4S+·NO3 −, is indicative of some conjugation of the sulfonamide π electrons with those of the pyridinium ring. The crystal structure is stabilized by N—H⋯O hydrogen bonds