New publication in Nature Physics
Our paper “Experimental investigation of the uncertainty principle in the presence of quantum memory and its application to witnessing entanglement” by myself, Deny Hamel, Roger Colbeck, Kent Fisher and K.J. Resch has been published last week in the online edition of Nature Physics. Heisenberg’s uncertainty principle provides a fundamental limitation on the ability of an observer holding classical information to predict the outcome when one of two measurements is performed on a quantum system. However, an observer with access to a particle (stored in a quantum memory) which is entangled with the system generally has a reduced uncertainty. We show this experimentally using entangled photon pairs, an optical delay line serving as a simple quantum memory and fast, active feed-forward.