Mixed states and pure states in QM

Matt Weiss (of the “Brooklyn” Quantum Meetup) will discuss the mathematics of pure states vs. mixed states, the latter of which come in two forms: “improper mixtures,” being the partial states of entangled quantum systems, and “proper mixtures,” which arise due to classical ignorance about which quantum system one is dealing with. He'll emphasize the crucial difference between the uncertainty associated with a local superposition, and the uncertainty associated with a local mixture, whether proper or improper. His aim will be to show the impossibility of the “stealth communication” proposed in last week’s lecture. There is in principle no way to locally determine whether a measurement has been made on a distant particle whose entangled pair one might hold in one’s possession even if, when the results of measurements on both particles are later compared, they reveal nonlocal correlations."

You will receive zoom access info shortly after you RSVP by meetup message and/or email (if I have your email address) if you RSVP by 12:01 PM on Aug 9.

Cheers,
Moshe Rozenblit PhD