%0 Journal Article
%A Nigg, Daniel
%A Müller, Markus
%A Martínez, Esteban A.
%A Schindler, Philipp
%A Hennrich, Markus
%A Monz, Thomas
%A Martín-Delgado Alcántara, Miguel Ángel
%A Blatt, Rainer
%T Quantum computations on a topologically encoded qubit
%D 2014
%@ 0036-8075
%U https://hdl.handle.net/20.500.14352/35594
%X The construction of a quantum computer remains a fundamental scientific and technological challenge, in particular due to unavoidable noise. Quantum states and operations can be protected from errors using protocols for fault-tolerant quantum computing (FTQC). Here we present a step towards this by implementing a quantum error correcting code, encoding one qubit in entangled states distributed over 7 trapped-ion qubits. We demonstrate the capability of the code to detect one bit flip, phase flip or a combined error of both, regardless on which of the qubits they occur. Furthermore, we apply combinations of the entire set of logical single-qubit Clifford gates on the encoded qubit to explore its computational capabilities. The implemented 7-qubit code is the first realization of a complete Calderbank-Shor-Steane (CSS) code and constitutes a central building block for FTQC schemes based on concatenated elementary quantum codes. It also represents the smallest fully functional instance of the color code, opening a route towards topological FTQC.
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