Keynote Speaker

Title

Non-equilibrium interaction between quantum devices

Abstract

Non-equilibrium interactions between quantum devices are unavoidable during read-out processes, as exemplified by the readout of the state of charge and spin qubits realized in semiconductor quantum dots. Here one often employs a biased quantum point contact (QPC) as charge detector and has to consider potential back-action processes acting on the quantum dot circuitry(1). Recent experiments are reviewed that illuminate such back-action processes and attempt to clarify their physical origins. In particular we discuss the action of a biased QPC as emitter of energy quanta onto an electrically separated but close-by detector circuit containing either a double quantum dot(2) or an individual QPC(3). In either case current driven through the strongly biased QPC emitter results in a driven current in the adjacent and unbiased detector circuit.

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Title

Quantum communication between quantum memories

Abstract

One of the challenges in quantum information and communication is a faithful transfer of a quantum state of a pulse of light – an information carrier - onto a state of atomic memory where it can be stored and processed. In particular, storage of entangled states of light is of major importance since entangled states form the basis for many quantum information protocols.

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Title

Dynamics of open quantum systems: From cold atoms and ions to biological complexes

Abstract

One of the principal aims of quantum information science is the achievement of controlled quantum dynamics in small to medium sized quantum many-particle systems and the uncovering of important principles governing their dynamics. The results of this endeavor will be the application of these findings to the simulation of quantum effects that may not be directly accessible in standard experiments or the analysis of naturally occurring dynamics.

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