Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 9: Quantum Information: Quantum Computation I
Q 9.1: Gruppenbericht
Montag, 23. März 2015, 14:30–15:00, B/gHS
Experimental realization of Quantum Fourier Transform based on multiple coupling — •Theeraphot Sriarunothai1, Christian Piltz1, Svetoslav Ivanov2, Andrés Varón1, Gouri Giri1, and Christof Wunderlich1 — 1Department Physik, Universität Siegen, 57068 Siegen, Germany — 2Department of Theoretical Physics, Sofia University St Kliment Ohridski, Sofia 1164, Bulgaria
Here we present tools to realize a quantum computer. Using a MAgnetic field Gradient Induced Coupling (MAGIC) scheme, we have demonstrated addressability of individual ions, single qubit gates and conditional quantum dynamics. Now we show that either joint or selective coupling between qubits can be chosen.
Consisting of the mentioned tools, a novel route to implement Quantum Fourier Transform (QFT) is presented, using microwave driven trapped 171Yb+ ion qubits in a static magnetic gradient, which features adjustable long-range coupling between (non-)neighbouring ions. This enables to interact between all pairs of qubits simultaneously. Implementation of QFT using this method is significantly faster compared to the conventional sequential approach.
An experimental study of sub-sequences of the optimized QFT sequence is presented. During the whole sequence, the system dynamics are protected by dynamical decoupling pulses which are interleaved with the QFT sequence. We characterize the performance of the realization by comparing the results of basis states with the theoretical calculation. Furthermore, the QFT gate is also applied to some particular quantum states to calculate their periods.