کوانتوم اپتیک و کوانتوم اپتومکانیک

An unambiguous signature of strongly coupled systems is the occurrence of normal mode splitting, a phenomenon known to both classical and quantum physics.
In the simplest case, two independent harmonic oscillators coupled via an additional joint spring will behave as a pair of uncoupled oscillators so-called normal
modes  with shifted resonance frequencies compared to
the individual resonators.