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Microfabricated traps and high-fidelity readout for trapped ions

David Lucas, Oxford University

(Session : Thursday from )

Abstract. Two essential goals for quantum information processing are scaling up the number of qubits in the system and achieving fast high-fidelity operations. We report on progress in the Oxford ion trap group towards these goals. Firstly we are designing, fabricating and testing several multi-zone traps for increasing the number of qubits that can be manipulated. Secondly we have been studying high-fidelity readout using different detection methods. We have already reported high-fidelity readout for a single qubit (99.99% in 145us) using a photomultiplier [1]. We have now also demonstrated simultaneous readout of a 4-ion "qunybble" using a CCD camera: the 99.99% fidelity level is also achieved, despite the presence of significant cross-talk between neighbouring qubits. We will discuss the criteria for reliable readout in the context of the system design for an ion trap QC. [1] A.H.Myerson et al., PRL 2008.