Fidelity of photon-mediated entanglement between remote nuclear-spin multi-qubit registers

Abstract

The electron spin of a nitrogen-vacancy center in diamond lends itself to the control of proximal ${}^{13}$C nuclear spins via dynamical decoupling methods, possibly combined with radio-frequency driving. Long-lived single-qubit states and high-fidelity electron-nuclear gates required for the realization of a multiqubit register have already been demonstrated. Towards the goal of a scalable architecture, linking multiple such registers in a photonic network represents an important step. Multiple pairs of remotely entangled qubits can enable advanced algorithms or error correction protocols. We investigate how a photonic architecture can be extended from the intrinsic nitrogen spin to multiple ${}^{13}$C spins per node. Applying decoherence-protected gates sequentially, we simulate the fidelity of creating multiple pairs of remotely entangled qubits. Even though the currently achieved degree of control of ${}^{13}$C spins might not be sufficient for large-scale devices, the two schemes are compatible in principle. One requirement is the correction of unconditional phases acquired by unaddressed nuclear spins during a decoupling sequence.

10 pages, 6 figures

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Cited by in corpus (4)

• Improved Electron-Nuclear Quantum Gates for Spin Sensing and Control
• High-Fidelity Entangling Gates for Electron and Nuclear Spin Qubits in Diamond
• Qubit-qudit entanglement transfer in defect centers with high-spin nuclei
• Suppression of coherent errors during entangling operations in NV centers in diamond