Relativistic quantum reference frames

10 03/2016

Thursday, 10 Mar. 2016, 11:00 - 12:30

Workgroup Brukner Group

Presenter: Alexander Smith
Host: Jacques Pienaar
Where: IQOQI Seminar Room, 2nd Floor, Boltzmanngasse 3, 1090 Vienna

Progress in physics, from Aristotelian physics, to Galilean and Newtonian physics, and then to both special and general relativity, can be viewed as a continual refinement of the notion of a reference frame.
The next natural step in this progression is the idea of a quantumreference frame. In this talk, I will summarize the basic tools that have been developed to study quantum reference frames and examine
howthey may be applied to relativistic scenarios. In particular we will look at how two observers in different Lorentz frames that are partially correlated can communicate via the exchange of a single massive spin 1Ž2 particle.
We will then examine an approach to quantum reference frames involving a trace over global degrees of freedom, rather than an average over all possible orientations of a system with respect to an external
reference frame. This approach is anticipated to help deal with reference frames associated with non-compact groups, such as the Poincaré group.