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Quantum computations on a topologically encoded qubit / D. Nigg; M. Muller; E. A. Martinez; P. Schindler; M. Hennrich; T. Monz; M. A. Martin-Delgado; R. Blatt

Science, Volume: 345, Issue: 6194, Pages: 302 - 305

Swansea University Author: Muller, Markus

DOI (Published version): 10.1126/science.1253742

Abstract

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...

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Published in: Science
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa28335
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Abstract: 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.
Keywords: Quantum Computation
College: College of Science
Issue: 6194
Start Page: 302
End Page: 305