Re: [Aspuru-Guzik Group List] ITAMP lunch seminar - Sebastian Hofer, University of Vienna (Thu, 04/07)

*ITAMP Topical Lunch Discussion* *Speaker:* Sebastian Hofer (University of Vienna, group M. Aspelmeyer) *Title:* Optomechanical Entanglement as a Resource for Quantum Control and Information Protocols *Abstract: *The opto- and electro-mechanical light--matter interaction provides the means to create entanglement between a mechanical oscillator and an electromagnetic field. In this talk I will discuss several quantum information and control protocols making use of this type of entanglement as their main resource. First, I will describe a Bell test using the Einstein--Podolski--Rosen entangled state recently generated by Palomaki et al., which would rule out any local and realistic explanation of the measured data without assuming the validity of quantum mechanics at macroscopic scales. Although challenging, the parameter regime required for our scheme has been demonstrated or is within reach of current experiments. In the second part, I will show how we can utilize entanglement within the framework of time-continuous quantum control in order to engineer the quantum state of a mechanical system. Specifically, I will analyze the creation of bipartite mechanical entanglement via time-continuous entanglement swapping, and preparation of a squeezed mechanical state by time-continuous teleportation. Finally I will show an experimental demonstration of optomechanical state estimation by Kalman filtering as a first step towards the implementation of the analyzed protocols. *Date:* Thursday, April 7th *Time:* 12:00-1:30 pm Pizza will be served. *Location:* B-106 @ Center for Astrophysics (60 Garden Street) Directions: after entering the lobby of the CfA, turn right to enter the hallway of the B building. In the hallway, turn right again, and B-106 is there. -- Dr. Igor Pikovski Institute for Theoretical Atomic, Molecular and Optical Physics (ITAMP) Harvard-Smithsonian Center for Astrophysics 60 Garden St, MS-14; Cambridge, MA 02138, USA Tel.: +1 (617) 496-7613 e-mail: igor.pikovski(a)cfa.harvard.edu www.cfa.harvard.edu/~igor.pikovski/