Entanglement purification for quantum computation

We show that thresholds for fault-tolerant quantum computation are solely determined by the quality of single-system operations if one allows for d-dimensional systems with 8 < or = d < or = 32. Each system serves to store one logical qubit and additional auxiliary dimensions are used to creat...

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Bibliographic Details
Published in:Physical review letters 2003-02, Vol.90 (6), p.067901-067901, Article 067901
Main Authors: Dür, W, Briegel, H-J
Format: Article
Language:English
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Summary:We show that thresholds for fault-tolerant quantum computation are solely determined by the quality of single-system operations if one allows for d-dimensional systems with 8 < or = d < or = 32. Each system serves to store one logical qubit and additional auxiliary dimensions are used to create and purify entanglement between systems. Physical, possibly probabilistic two-system operations with error rates up to 2/3 are still tolerable to realize deterministic high-quality two-qubit gates on the logical qubits. The achievable error rate is of the same order of magnitude as of the single-system operations. We investigate possible implementations of our scheme for several physical setups.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.90.067901