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Kalb, N. (author)Quantum networks promise to be the future architecture for secure communication and distributed quantum computation. This thesis describes experiments on nitrogenvacancy (NV) centres that lead towards a versatile multi-node quantum network consisting ofmulti-qubit nodes.<br/>The NV centre in diamond is a spinful optically-active crystal defect....doctoral thesis 2018
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Kalb, N. (author), Cramer, J. (author), Twitchen, D. J. (author), Markham, M. (author), Hanson, R. (author), Taminiau, T.H. (author)Repeated observations inhibit the coherent evolution of quantum states through the quantum Zeno effect. In multi-qubit systems this effect provides opportunities to control complex quantum states. Here, we experimentally demonstrate that repeatedly projecting joint observables of multiple spins creates quantum Zeno subspaces and...journal article 2016
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Cramer, J. (author), Kalb, N. (author), Rol, M.A. (author), Hensen, B.J. (author), Blok, M.S. (author), Markham, M. (author), Twitchen, D. J. (author), Hanson, R. (author), Taminiau, T.H. (author)Reliable quantum information processing in the face of errors is a major fundamental and technological challenge. Quantum error correction protects quantum states by encoding a logical quantum bit (qubit) in multiple physical qubits. To be compatible with universal fault-tolerant computations, it is essential that states remain encoded at all...journal article 2016
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Reiserer, A.A. (author), Kalb, N. (author), Blok, M.S. (author), van Bemmelen, Koen J M (author), Taminiau, T.H. (author), Hanson, R. (author), Twitchen, Daniel J. (author), Markham, Matthew (author)The realization of a network of quantum registers is an outstanding challenge in quantum science and technology. We experimentally investigate a network node that consists of a single nitrogen-vacancy center electronic spin hyperfine coupled to nearby nuclear spins. We demonstrate individual control and readout of five nuclear spin qubits...journal article 2016
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Hensen, B.J. (author), Kalb, N. (author), Blok, M.S. (author), Dréau, A.E. (author), Reiserer, A.A. (author), Vermeulen, R.F.L. (author), Schouten, R.N. (author), Markham, M. (author), Twitchen, D.J. (author), Goodenough, K.D. (author), Elkouss Coronas, D. (author), Wehner, S.D.C. (author), Taminiau, T.H. (author), Hanson, R. (author)The recently reported violation of a Bell inequality using entangled electronic spins in diamonds (Hensen et al., Nature 526, 682–686) provided the first loophole-free evidence against local-realist theories of nature. Here we report on data from a second Bell experiment using the same experimental<br/>setup with minor modifications. We find a...journal article 2016