A robust quantum memory for quantum networks

Quantum networks are a promising technology with applications in quantum computation and communication. The key idea is to use photons to entangle network nodes, which contain data qubits that can robustly store and process quantum states. The size and complexity of current quantum network protocols are limited by the decoherence of the data qubits during the entanglement-link generation process[1,2]. In this work, we introduce a new type of data qubit for quantum networks, consisting of a nearest-neighbours pair of C13 nuclear spins [3] in a diamond lattice. We show that this qubit provides an extremely coherent quantum memory, that is also robust to the optical entanglement links. This extended coherence is expected to enable a new generation of quantum network protocols.



1. Pompili, Matteo, et al. "Realization of a multinode quantum network of remote solid-state qubits." Science 372.6539 (2021): 259-264.

2. Bradley, C. E., et al. "Robust quantum-network memory based on spin qubits in isotopically engineered diamond." npj Quantum Information 8.1 (2022): 122.

3. H. P. Bartling, et al. " Entanglement of Spin-Pair Qubits with Intrinsic Dephasing Times Exceeding a Minute" Phys. Rev. X 12, 011048, (2022)