Quantropy

John Baez introduces a notion of “quantropy” which is supposed to be a quantum-dynamical analogue to entropy in statistical mechanics.

“But wait,” you say, “there’s already a perfectly good notion of entropy in quantum mechanics: von Neumann entropy!”

Yes, I reply, but that’s still statistical mechanics; quantum statistics. Baez’s analogy is between thermodynamics and the path integral formulation of quantum dynamics.

“Is that really a robust analogy?” you ask.

I’ll need a better night’s sleep before I can give you an answer on that, I reply.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s