Robust quantum-network memory using decoherence-protected subspaces of nuclear spins
A.A. Reiserer (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab)
Norbert Kalb (TU Delft - QID/Hanson Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
M.S. Blok (Kavli institute of nanoscience Delft, TU Delft - QN/Quantum Transport, TU Delft - QuTech Advanced Research Centre)
Koen J M van Bemmelen (Student TU Delft, Kavli institute of nanoscience Delft)
T.H. Taminiau (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Taminiau Lab)
Ronald Hanson (Kavli institute of nanoscience Delft, TU Delft - QID/Hanson Lab, TU Delft - QN/Hanson Lab, TU Delft - QuTech Advanced Research Centre)
D. J. Twitchen (Element Six Innovation)
M. Markham (Element Six Innovation)
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Abstract
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 within one node. We then characterize the storage of quantum superpositions in individual nuclear spins under repeated application of a probabilistic optical internode entangling protocol. We find that the storage fidelity is limited by dephasing during the electronic spin reset after failed attempts. By encoding quantum states into a decoherence-protected subspace of two nuclear spins, we show that quantum coherence can be maintained for over 1000 repetitions of the remote entangling protocol. These results and insights pave the way towards remote entanglement purification and the realization of a quantum repeater using nitrogen-vacancy center quantum-network nodes.
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