A review is given on the foundations and applications of non-Hermitian classical and
quantum physics. First, key theorems and central concepts in non-Hermitian linear algebra …

Magnonics addresses the dynamic excitations of a magnetically ordered material. These
excitations, referred to as spin waves and their quanta, magnons, are a powerful tool for …

Cavity magnonics deals with the interaction of magnons—elementary excitations in
magnetic materials—and confined electromagnetic fields. We introduce the basic physics …

Engineered quantum systems enabling novel capabilities for computation and sensing have
blossomed in the last decade. Architectures benefiting from combining complementary …

The magnon cat state represents a macroscopic quantum superposition of collective
magnetic excitations of large number spins that not only provides fundamental tests of …

Spin insulatronics covers efforts to generate, detect, control, and utilize high-fidelity pure
spin currents and excitations inside magnetic insulators. Ultimately, the new findings may …

Mechanical degrees of freedom, which have often been overlooked in various quantum
systems, have been studied for applications ranging from quantum information processing to …

Quantum information technology based on solid state qubits has created much interest in
converting quantum states from the microwave to the optical domain. Optical photons, unlike …

Cavity optomagnonics has emerged as a promising platform for studying coherent photon-
spin interactions as well as tunable microwave-to-optical conversion. However, current …

A quantum network consisting of magnonic and mechanical nodes connected by light is
proposed. Recent years have witnessed a significant development in cavity magnonics …