This is known as the spectral gap.

这被称为光谱隙。

Some systems have a significant spectral gap, whereas others are gapless.

有些系统有明显的频谱间隙，而其他系统则无间隙。

They don't have the energy needed to overcome the spectral gap.

它们没有足够的能量来克服光谱差距。

Complex quantum systems are Turing-complete, and their halting problem is the spectral gap question.

复杂量子系统是图灵完备的，其停机问题就是谱隙问题。

Only recently, in 2015, did mathematicians prove that in general the spectral gap question is undecidable.

直到最近的 2015 年，数学家才证明谱隙问题一般是不可判定的。