Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: Quantum Coherence and Quantum Information Systems II

TT 7.1: Talk

Monday, March 26, 2007, 14:00–14:15, H20

Use of dynamical coupling for improved quantum state transfer — •Andriy Lyakhov and Christoph Bruder — University of Basel, Switzerland

Efficient short-distance quantum state transfer is an important problem in quantum information processing. One of the most promising solutions is to use chains constructed from qubits that are statically coupled to each other [1]. Here, we propose a method to improve quantum state transfer in such transmission lines. The idea is to localize the information on the last qubit of a transmission line by dynamically varying the coupling constants between the first and the last pair of qubits. We also show that this method increases the fidelity of the state transfer and that this effect is stable to static disorder in the coupling constants and dynamical fluctuations in the coupling/decoupling functions [2].

[1] S. Bose, Phys. Rev. Lett. 91 207901 (2003)

[2] A. O. Lyakhov and C. Bruder, Phys. Rev. B 74, 235303 (2006)