  In spite of its outstanding success, quantum mechanics remains mysterious,
many problems such as wave/particle dualism and quantum nonlocality remain
open. Because a particle, e.g. a photon, is a quantum of a corresponding
quantum field, an arbitrary particle state directly corresponds to a quantum
field, which shows the quantum field is nonlocal. A microphysical entity (ME)
can be taken as the corresponding quantum field which is in the state of a
quantum, where the quantum field is responsible for the ME's wave-like nature
and the quantum for the ME's particle-like nature. A quantum state directly
corresponds to a quantum field. Base on this simple model, many big problems in
quantum physics, such as the wave/particle dualism, the collapse of the quantum
state on measurement, the nonlocality in quantum entanglement, quantum
teleportation, quantum swapping, and the paradox in the delayed-choice
entanglement swapping, can be solved in very simple and natural manners.
