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

Abstract

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 $0.940\pm 0.005$ for the bare qubit to $0.993\pm 0.002$ 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.

Minor changes. Updated figures, some text and added more references

References in corpus (16)

• Surface codes: Towards practical large-scale quantum computation
• Universal dynamical decoupling of a single solid-state spin from a spin bath
• Robust randomized benchmarking of quantum processes
• Decoherence-protected quantum gates for a hybrid solid-state spin register
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Nano-engineered Diamond Waveguide as a Robust Bright Platform for Nanomagnetometry Using Shallow Nitrogen Vacancy Centers
• Quantifying the quantum gate fidelity of single-atom spin qubits in silicon by randomized benchmarking
• Universal coherence protection in a solid-state spin qubit
• Protecting a solid-state spin from decoherence using dressed spin states
• Room temperature coherent control of protected qubit in hexagonal boron nitride
• The SMART protocol -- Pulse engineering of a global field for robust and universal quantum computation
• Quantum Computation Protocol for Dressed Spins in a Global Field
• Optimal control of fast and high-fidelity quantum gates with electron and nuclear spins of a nitrogen-vacancy center in diamond
• Implementation of the SMART protocol for global qubit control in silicon
• Coherent control of electron spin qubits in silicon using a global field
• Observing hyperfine interactions of NV centers in diamond in an advanced quantum teaching lab

Cited by in corpus (4)

• Entangling gates on degenerate spin qubits dressed by a global field
• High-Fidelity Entangling Gates for Electron and Nuclear Spin Qubits in Diamond
• A dressed singlet-triplet qubit in germanium
• Concatenated continuous driving of silicon qubit by amplitude and phase modulation