Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quanteninformation: Atome und Ionen 2

Q 47.5: Vortrag

Donnerstag, 15. März 2012, 15:00–15:15, V7.02

An individual trapped-ion pseudo-molecule with adjustable spin-spin coupling — •Andrés F. Varón, Anastasiya Khromova, Christian Piltz, Timm F. Gloger, Michael Johanning, and Christof Wunderlich — Universität Siegen, NT Fakultät, Department Physik, 57068 Siegen, Germany

Already early on during the development of quantum information science nuclear magnetic resonance (NMR) has been successfully applied to realize quantum algorithms based on J-coupling between nuclear spins in molecules. Scalability of NMR is hampered mainly by the use of ensembles of molecules. Additionally, nuclear spin resonances and J-coupling between spins are determined by the molecule structure, and thus often are not well suited for quantum computing. Here, we report on the creation and experimental investigation of an individual 3-spin pseudo-molecule that exhibits adjustable J-type coupling between spin states. This coupling has been employed to entangle consecutive spins or distant ones at demand using microwave radiation. Effective spin-1/2 systems are realized by using hyperfine states of trapped atomic ions. They are addressed with high fidelity since the resonances of individual spins are well separated due to a spatially varying magnetic field which also induces the J-type coupling mediated by the vibrational modes of this ion pseudo-molecule. The demonstration of Conditional-NOT gates between non-nearest neighbours serves as a proof-of- principle of a novel quantum bus employing a spin chain.