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

By A. Reiserer, N. Kalb, M. Blok, Koen J. M. van Bemmelen, Daniel J. Twitchen, M. Markham, Tim Taminiau, Ronald Hanson. 2016

156 citations recorded by the source corpus.

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 (NV) 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 inter-node 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 realisation of a quantum repeater using NV center quantum network nodes.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/68dfda4b5ed2b5325ad4c6d81d95e18003ec9db4

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Deterministic delivery of remote entanglement on a quantum network (2017, background): “In combination with recent progress on robust storage of quantum states during remote entangling operations [10, 32], the techniques reported here reveal a direct path to the creation of many-body quantum states distributed over multiple quantum network nodes.”
Quantum information processing with superconducting circuits: a review (2016, background): “Important experimental steps toward largescale quantum networks have recently been taken through demonstrations of loopholefree Bell tests [524, 525], quantum network memory [526], perfect state transfer of an entangled photonic qubit [527], and digital photonic QIP [528–530].”
A link layer protocol for quantum networks (2019, background): “99 (2 μs) [82] Carbon initialization in |0⟩ 0.”
Quantum internet: A vision for the road ahead (2018, background): “In a similar fashion, carbon-13 nuclear spins near a diamond N-V center provide a robust register of memory qubits that do not interact with the laser control fields on the N-V electron spin (84).”