In any textbooks I have seen, vacuum states are defined as:(adsbygoogle = window.adsbygoogle || []).push({});

a |0>= 0

What is the difference between|0> and 0?

Again, what happens whena^{+}act on |0> and 0?

andNumber Operator a^{+}a act on |0> and 0?

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# Quantum States and ladder operator

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