What does it mean for half of an empty box to be full?

4 03/2015

Wednesday, 04 Mar. 2015, 15:30 - 16:30

Presenter: Eric Brown (University of Waterloo, Canada)
Host: VCQ
Where: IQOQI-Seminarroom, Boltzmanngasse 3, 3rd floor, 1090 Vienna

Abstract: It is known that the vacuum state of a quantum field is spatially entangled. This is true both in free and confined spaces, for example in an optical cavity. The obvious consequence of this, however, is surprising and intuitively challenging. Namely that, in some formal sense, half of an empty box is full. However, what does this physically mean in terms of, say, measurements that can actually be made? In this contribution I will discuss a new and simple perspective that answers this question precisely and physically concretes the phenomenon. In so doing I will also propose a simple experimental setup for the verification of vacuum entanglement.