Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quanteninformation: Atome und Ionen 2

Q 47.2: Talk

Thursday, March 15, 2012, 14:15–14:30, V7.02

Dynamical decoupling sequences for realizing robust quantum gates and memories with trapped ions — •Christian Piltz, Anastasiya Khromova, Benedikt Scharfenberger, Timm Florian Gloger, Michael Johanning, Andrés Varón, and Christof Wunderlich — Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany

Dynamical decoupling (DD) is a widely used technique in the framework of nuclear magnetic resonance to protect the coherence of quantum systems against a detrimental environment. DD pulse sequences can be used to enhance the coherence time of quantum memories and the fidelity of quantum gates. However, imperfections of pulses may destroy quantum information or interfere with gate dynamics. We investigate different sequences with respect to their capability to suppress decoherence while still being robust against pulse imperfections in an ion trap experiment. Our results obtained with ¹⁷¹Yb⁺ ions demonstrate that sequences based on varying phases are self-correcting. We found sequences that allow for the implementation of a conditional quantum gate even if the gate time is more than one order of magnitude longer than the coherence time of the system. Furthermore, we show that DD sequences can be combined with selective recoupling to implement quantum memories with trapped ions.