Montag, 18. Februar 2019, 11:00
Talk by Anupam Mazumdar, Mon. Feb. 18, 11 am at the IQOQI seminar room
Understanding linearized aspects of gravity in the framework of quantum mechanics is one of the great challenges in modern physics. Along this line, a prime question is to find whether the linearized gravity is a quantum entity subject to the rules of quantum mechanics. Here, I will introduce an idea for such a test based on the principle that two objects cannot be entangled without a quantum mediator. We show that despite the weakness of gravity, the phase evolution induced by the gravitational interaction of two micron size test masses in adjacent matter-wave interferometers can detectably entangle them even when they are placed far apart enough to keep Casimir-Polder forces at bay. I will discuss the prescription for witnessing this entanglement, which certifies gravity as a quantum off-shell mediator, through simple correlation measurements between two spins: one embedded in each test mass. I will discuss how this experiment can place a potential constraint on the nature of gravity at short distances as well.