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High Fidelity Control of a Nitrogen-Vacancy Spin Qubit at Room Temperature using the SMART Protocol by Vallabhapurapu, Hyma H.; Hansen, Ingvild; Adambukulam, Chris; Stohr, Rainer; Denisenko, Andrej; Yang, Chih Hwan; Laucht, Arne is a scholarly article available to read on EtoBox.

What is High Fidelity Control of a Nitrogen-Vacancy Spin Qubit at Room Temperature using the SMART Protocol about?

A practical implementation of a quantum computer requires robust qubits that are protected against their noisy environment. Dynamical decoupling techniques have been successfully used in the past to offer protected high-fidelity gate operations in negatively-charged Nitrogen-Vacancy (NV-) centers in diamond, albeit under specific conditions with the intrinsic nitrogen nuclear spin initialised. In this work, we show how the SMART protocol, an extension of the dressed-qubit concept, can be implemented for continuous protection to offer Clifford gate fidelities compatible with fault-tolerant schemes, whilst prolonging the coherence time of a single NV- qubit at room temperature. We show an improvement in the average Clifford gate fidelity from $0.940\pm0.005$ for the bare qubit to $0.993\pm0.002$ for the SMART qubit, with the nitrogen nuclear spin in a random orientation. We further show a $\gtrsim$ 30 times improvement in the qubit coherence times compared to the bare qubit.

Author

Vallabhapurapu, Hyma H.; Hansen, Ingvild; Adambukulam, Chris; Stohr, Rainer; Denisenko, Andrej; Yang, Chih Hwan; Laucht, Arne

Published

2022

Language

EN