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Q: Fachverband Quantenoptik und Photonik

Q 1: Quantum Information: Concepts and Methods I

Q 1.1: Gruppenbericht

Montag, 6. März 2017, 14:30–15:00, P 2

Control of quantum state transfer in one dimensional structures — •David Petrosyan — Institute of Electronic Structure & Laser, Foundation for Research and Technology - Hellas, Heraklion, Crete, Greece

After an outline of the activities of our theoretical Quantum Optics and Technology group, which involve studies of cold atoms, coherent quantum effects in atomic ensembles, interacting Rydberg gases, physical implementations of quantum computation and communication, and quantum cryptography, I will present some of our results on control and manipulation of quantum state transfer in several physical settings, including atomic and photonic lattices.

Faithful transfer of quantum states in spin chains is indispensable for scalable realization of quantum computation in many systems where qubit-qubit interactions have finite range. I will discuss state transfer protocols in spin chains with static and dynamic inter-spin couplings, and their robustness with respect to diagonal and off-diagonal disorder. I will then present a scheme for a quantum spin transistor in a Heisenberg spin chain, which realizes conditional state transfer. A proof-of-concept realization of the device can be done with just a few cold, trapped atoms, but the idea is generally applicable to various other implementations of spin chains. Finally, I will describe manipulation and transfer of non-classical motional states of atoms in a lattice using Rydberg dressing with off-resonant lasers.