Robust quantum-network memory using decoherence-protected subspaces of nuclear spins

Reiserer, A.A.; Kalb, N.; Blok, M.S.; van Bemmelen, Koen J M; Taminiau, T.H.; Hanson, R.; Twitchen, Daniel J.; Markham, Matthew

doi:10.1103/PhysRevX.6.021040

Robust quantum-network memory using decoherence-protected subspaces of nuclear spins

Title

Robust quantum-network memory using decoherence-protected subspaces of nuclear spins

Author

Reiserer, A.A. (TU Delft QID/Hanson Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Kalb, N. (TU Delft QID/Hanson Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Blok, M.S. (TU Delft QN/Quantum Transport; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
van Bemmelen, Koen J M (Student TU Delft; Kavli institute of nanoscience Delft)
Taminiau, T.H. (TU Delft QID/Taminiau Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Hanson, R. (TU Delft QID/Hanson Lab; TU Delft QN/Hanson Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Twitchen, Daniel J. (Element Six Innovation)
Markham, Matthew (Element Six Innovation)

Date

2016

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.

Subject

Quantum Physics
Quantum Information

To reference this document use:

http://resolver.tudelft.nl/uuid:b83b76f2-1f74-40f8-800f-0c5e521ba76b

DOI

https://doi.org/10.1103/PhysRevX.6.021040

ISSN

2160-3308

Source

Physical Review B, 6 (2)

Part of collection

Institutional Repository