The nuclear spins are long-lived and robust against optical excitation of the NV electron spin, which can make these spins a robust quantum register for quantum error correction.In Ch. ![]() Using dynamical decoupling techniques these nuclear spins can be detected via the NV electron spin through the hyperfine interaction. As the number of spins that are close enough to the NV centre to be strongly coupled is limited, we employ the weakly coupled nuclear spins in the spin bath of the NV centre. At liquid helium temperatures (cryogenic temperature, ~4 K = -269 C), the NV electron spin provides high-fidelity single-shot readout and long coherence times.The NV centre is surrounded by naturally available (1.1% abundance) nuclear C13 spins. The spin state can be manipulated by microwave fields and optically read out. This defect effectively results in an electronic spin that can be addressed as a qubit. The nitrogen-vacancy (NV) centre in diamond is a lattice defect consisting of a nitrogen atom (N) and a vacancy (V) on two adjacent diamond lattice sites. Errors can be detected and corrected by measurement of correlations, so-called stabilizer-measurements, on these qubits.The experimental work presented in this thesis employs multiple spins in diamond as qubits to explore and implement error correction protocols. ![]() In such protocols, a quantum state is protected against errors by encoding in multiple qubits. In this thesis we present the experimental implementation of quantum error correction protocols based on spins in diamond. Therefore, realistic large-scale quantum information processing requires the protection of quantum bits (qubits) against errors. However, quantum information is very fragile inevitable errors continuously build up and eventually all information is lost. ![]() Quantum error correction with spins in diamondÄigital information based on the laws of quantum mechanics promisses powerful new ways of computation and communication.
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