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Feedback Error Correction Method of Creating Pseudo-Pure States for NMR Quantum Computers

Minaru Kawamura
In this paper, a feedback error correction method of creating pseudo-pure states for large scale nuclear magnetic resonance quantum computers (NMR-QC) is proposed that is aimed at creating the initial states asymptotically within a specified error tolerance by using a spatial averaging method. The present method enables almost complete error correction and even enhances the NMR signal compared with the initial state. An implementation of this method was successfully demonstrated on a five-qubit NMR-QC.
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