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The quest for long-lived quantum bit

The field of quantum information processing (quantum computation and quantum communication) has grown considerably in recent decades. Numerous proof-of-principle experiments on small-scale quantum systems (few physical degrees of freedom) have been carried out in various physical frameworks such as NMR (nuclear magnetic resonance), trapped ions, linear optics and superconducting circuits. In spite of all these achievements, and to make it a useful technology, an important step of scaling is required for multi-qubit (quantum-bit) protocols. The main obstacle here is the destruction of quantum coherence ...
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