Speaker: Vladimır Buzek (Research Center for Quantum Information, Slovak Academy of Sciences, Slovakia)

When: Thu, Jan 24, 4:00pm – 5:30pm

Where: S15-03-16 CQT Seminar Room

Talk on: Quantum infodynamics (An attempt to describe dynamics of open quantum systems using quantum information theory)

Abstract: In my talk will analyze how information encoded in a quantum system is “diluted” in reservoirs. In particular, I will describe a universal quantum homogenizer, which is a quantum machine that takes as an input a system qubit initially in the state _ and a set of N reservoir qubits initially prepared in the same state _. In the homogenizer the system qubit sequentially interacts with the reservoir qubits via the partial-SWAP transformation. The homogenizer realizes, in the limit sense, the transformation such that at the output each qubit is in an arbitrarily small neighborhood of the state _ irrespective of the initial states of the system and the reservoir qubits. This means that the system qubit undergoes an evolution that has a fixed point, which is the reservoir state _. The model of the homogenizer allows us to understand various aspects of the dynamics of open systems interacting with non-equilibrium environments. In particular, the reversibility vs or irreversibility of the dynamics of the open system is directly linked to specific (classical) information about the order in which the reservoir qubits interacted with the system qubit. I will analyze possible physical realization of quantum homogenization. In addition, I will discuss how entanglement is established between particles involved in homogenization process. Finally, I will show how a master equation governing dynamics of the system qubit during the homogenization process can be derived.