High-Fidelity Electron Spin Gates for Scaling Diamond Quantum Register

Abstract

Diamond is a promising platform for quantum information processing as it can host highly coherent qubits that could allow for the construction of large quantum registers. A prerequisite for such devices is a coherent interaction between nitrogen vacancy (NV) electron spins. Entanglement between dipolar-coupled NV spin pairs has been demonstrated, but with a limited entanglement fidelity and its error sources have not been characterized. Here, we design and implement a robust, easy to implement entangling gate between NV spins in diamond and quantify the influence of multiple error sources on the gate performance. Experimentally, we demonstrate a record gate fidelity of $F=(96.0\pm 2.5)$ % under ambient conditions. Our identification of the dominant errors paves the way towards NV-NV gates beyond the error correction threshold.

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Cited by in corpus (4)

• The Role of Quantum Computing in Advancing Scientific High-Performance Computing: A perspective from the ADAC Institute
• Quantum Memory Enhanced Multipoint Correlation Spectroscopy for Statistically Polarized NMR
• Resource state generation for a multispin register in a hybrid matter-photon quantum information processor
• Efficiency of optimal control for noisy spin qubits in diamond