Dear Colleagues,

Symmetry is a driving force of Nature. It means equilibrium and tension. It features space-time curvatures, quantum information, states algebra, and the structure and properties of matter in isolated and open systems. Symmetry is formalized in mathematical groups, functions, orbitals, types of interactions, the properties of molecules, degrees of freedom, and in entropy–negentropy transformations; it characterizes order, chaos, fractalizations of structures, networks, and their patterned graphs. At present there is increasing clearness that symmetry, perhaps along with statistics, acts as a silent potential of matter, quanta, and energies. Its insights have always offered the way to make leaps in science and technology, while merging with the quantum information at the level of atoms, molecules, solid states, and nanomaterials at large, and may be the key to a unified understanding of the next level of quantum theory in general and of quantum nanochemistry in particular. The present Special Issue therefore aims to gather some of the current challenging research explorations in turning the scholastic quantum chemistry “to the earth”, however by further inherent complexification through its nano-design, properties, observation, and functionalization of certain symmetries/breaking symmetries into the intelligent nano-chemistry readiness level. The topics of interest include but are not limited to:

• Many-body structure of atoms, molecules, and solid states;
• Quanta, quantization, and low-dimensional systems;
• Opto-quantum interaction, dynamics, and correlations;
• Molecular symmetry, chemical graph theory, and nano-design;
• Functional nano-materials and spectroscopy;
• Symmetry-breaking and quasi-particles;
• Quantum linear algebra, operators, and chemical bonding entanglement;
• Quantum logics and molecular computation;
• Quantum information and artificial intelligence;
• Chemical spin-reactivity, approximation methods, and observability.

Prof. Dr. Habil. Mihai V. Putz
Guest Editor