Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 18: Transport: Quantum Coherence and Quantum Information Systems 2 (jointly with TT, MA)
HL 18.7: Vortrag
Montag, 26. März 2012, 16:45–17:00, BH 243
Quantum state transfer in boundary-controlled and fully engineered spin chains — Analia Zwick1,2, Gonzalo A. Álvarez1, •Joachim Stolze1, and Omar Osenda2 — 1Institut für Physik, TU Dortmund, Germany — 2Facultad de Matemática, Astronomía y Física and Instituto de Física Enrique Gaviola, Universidad Nacional de Córdoba, Argentina
Quantum state transfer in presence of noise is one of the main challenges for building quantum computers. We compare the quantum state transfer properties for two classes of qubit chains under the influence of static randomness. In fully engineered chains all nearest-neighbor couplings are tuned in such a way that a single-qubit state can be transferred perfectly between the ends of the chain, while in boundary-controlled chains only the two couplings between the transmitting and receiving qubits and the remainder of the chain can be optimized. We study how the noise in the couplings affects the state transfer fidelity depending on the noise model and strength as well as the chain type and length. We show that the desired level of fidelity and transfer time are important factors in designing a chain. In particular we demonstrate that transfer efficiency comparable or better than that of the most robust engineered systems can also be reached in boundary-controlled chains without the demanding engineering of a large number of couplings.