QUANTUM ENTANGLEMENT OF COUPLED ANHARMONIC STRETCHES IN MOLECULES H2O AND SO2

摘要

Quantum entanglement of anharmonic stretches in molecules H2O and SO2 is studied in terms of the reduced-density linear entropy with initial squeezed vacuum states and thermal states. It is shown that the entropy of both kinds of initial states with a small amplitude n is quasi-periodic with the period of thermal states being larger than that of squeezed vacuum states for each molecule. The entropy evolution of both kinds of initial states with a larger amplitude n is irregular. For each kind of initial state, the frequency of oscillation of the entropy for SO2 is larger than that for H2O. That can be useful in quantum computing based on vibrational states in H2O and SO2.