2,2′-(Butane-1,4-di­yl)diisoquinolinium tetra­chloridozincate(II)

The crystal of the title compound, (C22H22N2)[ZnCl4], consists of 2,2′-(butane-1,4-di­yl)diisoquinolinium organic cations and [ZnCl4]2− complex anions. The cation is located across a twofold axis and the ZnII atom of the anion is located on the other twofold axis. The centroid–centroid distance between parallel pyridine rings of neighboring mol­ecules is 3.699 (3) Å, but the face-to-face separation of 3.601 (3) Å suggests there is no significant π–π stacking in the crystal structure

3-(Benzimidazolium-2-yl)propionate dihydrate

In the crystal struture of the title compound, C10H10N2O2·2H2O, the component species are linked to the water mol­ecules by N—H⋯O and O—H⋯O hydrogen bonds to form a three-dimensional network structure

Experimental Realization of Nonadiabatic Holonomic Single-Qubit Quantum Gates with Two Dark Paths in a Trapped Ion

For circuit-based quantum computation, experimental implementation of universal set of quantum logic gates with high-fidelity and strong robustness is essential and central. Quantum gates induced by geometric phases, which depend only on global properties of the evolution paths, have built-in noise-resilience features. Here, we propose and experimentally demonstrate nonadiabatic holonomic single-qubit quantum gates on two dark paths in a trapped $^{171}\mathrm{Yb}^{+}$ ion based on four-level systems with resonant drives. We confirm the implementation with measured gate fidelity through both quantum process tomography and randomized benchmarking methods. Meanwhile, we find that nontrivial holonomic two-qubit quantum gates can also be realized within current experimental technologies. Compared with previous implementations on three-level systems, our experiment share both the advantage of fast nonadiabatic evolution and the merit of robustness against systematic errors, and thus retains the main advantage of geometric phases. Therefore, our experiment confirms a promising method for fast and robust holonomic quantum computation.Comment: 13 pages, 5 figure

3a,11b-Dihydr­oxy-2-oxo-2,3,3a,11b-tetra­hydro-1H-imidazo[4,5-f][1,10]phenanthrolin-7-ium chloride

In the crystal structure of the title compound, C13H11N4O3 +·Cl−, the dihedral angle between the two pyridine rings is 9.72 (9) Å. Ions are linked via N—H⋯Cl, O—H⋯Cl and O—H⋯O hydrogen bonds, forming a three-dimensional framework

Octane-1,8-diyldipyridinium dibromide dihydrate

The asymmetric unit of the title compound, C18H26N2 2+·2Br−·2H2O, consists of one-half of the organic cation, one Br− anion and one water mol­ecule. The organic cation is situated on a centre of inversion. The dihedral angle between the pyridine ring and the plane of the central linkage is 59.3 (1)°. The cations, anions and water mol­ecules are linked via O—H⋯Br, C—H⋯Br and C—H⋯O hydrogen bonds, forming a three-dimensional framework

2,2′-(Decane-1,10-di­yl)dibenz­imid­azo­lium dichloride trihydrate

The organic cation in the title compound, C24H32N4 2+·2Cl−·3H2O, is situated on an inversion centre. The cations, anions and water mol­ecules are linked via N—H⋯O, N—H⋯Cl, O—H⋯O and O—H⋯Cl hydrogen bonds and C—H⋯π interactions, forming a three-dimensional framework

N′-(Phenyl­sulfon­yl)isonicotinohydrazide monohydrate

In the title compound, C12H11N3O3S·H2O, the pyridine ring makes a dihedral angle of 24.78 (14)° with the phenyl ring. Intra­molecular N—H⋯O and inter­molecular O—H⋯O hydrogen bonds are observed and stabilize the packing in the crystal structure

2,4,8,10-Tetra­oxa-3,9-dithia­spiro­[5.5]undecane 3,9-dioxide

The asymmetric unit of the title compound, C5H8O6S2, consists of two spiro­[5.5]undecane mol­ecules. The nonplanar six-membered rings adopt chair conformations. In the crystal structure, weak inter­molecular C—H⋯O inter­actions, together with close O⋯S contacts in the range 3.308 (3)–3.315 (3) Å, stabilize the packing

1,1′-(Butane-1,4-di­yl)dipyridinium dibromide dihydrate

The organic cation in the title compound, C14H18N2 2+·2Br−·2H2O, is situated on an inversion centre. The cations, anions and water mol­ecules are linked via O—H⋯Br, C—H⋯Br and C—H⋯O hydrogen bonds, and π–π stacking inter­actions between adjacent pyridine rings, with a centroid–centroid separation of 3.8518 (17) Å