Quantum systems without a classical limit

[wdlang]

in the literature, people are talking about 'quantum systems without a classical limit'

could anyone give me an example?

 

[ZapperZ]

There are no examples given in "the literature" that you read?

Zz.

 

[Avodyne]

Spin one-half. Or a system of coupled spin one-halfs.

 

[Ken G]

I'm not sure what is meant by "no classical limit." A white dwarf star in a sense is not a classical limit, even though it is a huge number of particles, but if you heat it up high enough it would explode and be a very classical type Ia supernova.