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Q: Fachverband Quantenoptik und Photonik

Q 47: Quantum Computing I

Q 47.3: Talk

Thursday, March 9, 2017, 15:15–15:30, P 2

The equivalence of static and dynamic magnetic gradient induced coupling — •Sabine Wölk and Christof Wunderlich — Department Physik, Universität Siegen, 57068 Siegen, Germany

A laser-less interaction between internal and motional states of trapped ions can be induced by a static [1] or by a dynamic [2] magnetic gradient field. Taking advantage of such Magnetic Gradient Induced Coupling (MAGIC), conditional quantum dynamics with effective spin states and motional states can be carried out which is useful for a variety of experiments in quantum information science.

Here, we show that the coupling mechanism in the presence of a dynamic gradient is the same, in a dressed state basis, as in the case of a static gradient [3]. This insight can be used to overcome demanding experimental requirements when using a dynamic gradient field. At the same time it opens new experimental perspectives when using a dynamic gradient field by taking advantage of long range coupled ions, for example, for multi-qubit dynamics.
[1] F. Mintert and Ch. Wunderlich, Phys. Rev. Lett. 87, 257904 (2001)
[2] C. Ospelkaus et al., Nature 476, 181 (2011)
[3] S. Wölk and Ch. Wunderlich, arXiv: 1606.04821