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Robust quantum-network memory based on spin qubits in isotopically engineered diamond

Journal Article (2022)
Author(s)

C.E. Bradley (TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

Śebastian de Bone (TU Delft - QuTech Advanced Research Centre, QuSoft, TU Delft - QID/Elkouss Group)

P. F.W. Möller (Student TU Delft)

S. Baier (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab, Kavli institute of nanoscience Delft)

M.J. Degen (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QID/Hanson Lab)

S.J.H. Loenen (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft)

Hans P. Bartling (Kavli institute of nanoscience Delft, TU Delft - QID/Taminiau Lab, TU Delft - QuTech Advanced Research Centre)

R. Hanson (TU Delft - QN/Hanson Lab, TU Delft - QID/Hanson Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

D. Elkouss Coronas (TU Delft - Quantum Information and Software, TU Delft - QuTech Advanced Research Centre)

Tim Taminiau (TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

More authors (External organisation)

Research Group
QID/Elkouss Group
Copyright
© 2022 C.E. Bradley, S.W. de Bone, P. F.W. Möller, S. Baier, M.J. Degen, S.J.H. Loenen, H.P. Bartling, R. Hanson, D. Elkouss Coronas, T.H. Taminiau, More Authors
DOI related publication
https://doi.org/10.1038/s41534-022-00637-w
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 C.E. Bradley, S.W. de Bone, P. F.W. Möller, S. Baier, M.J. Degen, S.J.H. Loenen, H.P. Bartling, R. Hanson, D. Elkouss Coronas, T.H. Taminiau, More Authors
Research Group
QID/Elkouss Group
Issue number
1
Volume number
8
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Abstract

Quantum networks can enable quantum communication and modular quantum computation. A powerful approach is to use multi-qubit nodes that provide quantum memory and computational power. Nuclear spins associated with defects in diamond are promising qubits for this role. However, dephasing during optical entanglement distribution hinders scaling to larger systems. Here, we show that a 13C-spin quantum memory in isotopically engineered diamond is robust to the optical link operation of a nitrogen-vacancy centre. The memory lifetime is improved by two orders-of-magnitude upon the state-of-the-art, surpassing reported times for entanglement distribution. Additionally, we demonstrate that the nuclear-spin state can survive ionisation and recapture of the nitrogen-vacancy electron. Finally, we use simulations to show that combining this memory with previously demonstrated entanglement links and gates can enable key network primitives, such as deterministic non-local two-qubit gates, paving the way for test-bed quantum networks capable of investigating complex algorithms and error correction.