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QI: Fachverband Quanteninformation

QI 4: Quantum Thermodynamics and Open Quantum Systems

QI 4.2: Vortrag

Dienstag, 21. September 2021, 14:30–14:45, H3

Necessary structure of a thermodynamic bath for entanglement generation via bath engineering — •Steffen Wilksen, Frederik Lohof, and Christopher Gies — Institut für Theoretische Physik, Universität Bremen, Otto-Hahn-Allee, 28334 Bremen

Interaction of a quantum mechanical system with the environment is usually considered to be an obstacle when preparing entangled states, because this interaction induces decoherence and destroys the entanglement. This does not have to be the case, as coupling the system to a carefully engineered thermal bath can help to create entanglement and even stabilize it indefinitely.

First we consider a non-interacting two-qubit Hamiltonian, where the entanglement is solely created by the system-bath interaction. Specifically, we look at the strength of entanglement as a function of different system parameters. We then generalize our results for a Hamiltonian of arbitrary size and examine the requirements of the Hamiltonian and thermal bath to create entangled states. In particular, we find necessary conditions for the structure of the system-bath interaction that give rise to the occurrence of bath mediated entanglement generation.