Thursday, August 06, 201512:30 PM - 1:30 PMT-DO Conference Room|
Work measurement as a generalized quantum measurement
Juan Pablo PazUniversity of Buenos Aires
I will discuss a new method to measure the work performed on a driven quantum system and to sample its probability distribution P(w). The method is based on a simple fact that remained unnoticed until now: Work on a quantum system can be measured by performing a generalized quantum measurement at a single time. Such measurement, which technically speaking is denoted as a POVM (positive operator valued measure) reduces to an ordinary projective measurement on an enlarged system. This observation not only demystifies work measurement but also suggests a new quantum algorithm to efficiently sample the distribution P(w). This can be used, in combination with fluctuation theorems, to estimate free energies of quantum states on a quantum computer.
Host: Sebastian Deffner