CVD-growth of ultra-pure diamond, generation of NV centers by ion-implantation and their spectroscopic characterization for quantum technological applications

Abstract

Abstract Applications of nitrogen-vacancy (NV) centers in diamond in quantum technology have attracted considerable attention in recent years. Deterministic generation of ensembles of NV centers can advance the research on quantum sensing, many-body quantum systems, multipartite entanglement and so on. Here we report the complete process of controlled generation of NV centers in diamond as well as their characterisation: growing diamond films through chemical vapor deposition (CVD), ion implantation and spectroscopic characterization of the defect centers using a confocal microscope. A microwave-assisted CVD set-up is presented which we constructed for the preparation of single-crystalline homoepitaxial diamond films. The films were prepared with minimized nitrogen concentration, which is confirmed through photoluminescence measurements. We demonstrate an in situ ultra high vacuum (UHV) implantation and heating process for creation of NV centers using a novel experimental set-up. For the first time hot implantation has been shown which prevents surface charging effects. We do not observe graphitization due to UHV heating. By optimizing the implantation parameters it has been possible to implant NV centers in a precise way. We present large area mapping of the samples to determine the distribution of the centers and describe the characterization of the centers by spectroscopic techniques. Reducing the decoherence caused by environmental noise is of primary importance for many applications in quantum technology. We demonstrate improvement on coherence time T_{2} of the NV spins by suppression of their interaction with the surrounding spin-bath using robust dynamical decoupling sequences.

References in corpus (11)

• Quantum Computing
• High-sensitivity diamond magnetometer with nanoscale resolution
• Universal dynamical decoupling of a single solid-state spin from a spin bath
• Nanoscale magnetic imaging of a single electron spin under ambient conditions
• Extending Quantum Coherence in Diamond
• Magnetic field imaging with NV ensembles
• Robust dynamical decoupling for quantum computing and quantum memory
• Dynamical Decoupling of a single electron spin at room temperature
• Single-spin magnetometry with multi-pulse sensing sequences
• Protecting a Spin Ensemble against Decoherence in the Strong-Coupling Regime of Cavity QED
• Quantum simulation of artificial Abelian gauge field using nitrogen-vacancy center ensembles coupled to superconducting resonators

Cited by in corpus (5)

• n-Type diamond synthesized with tert-butylphosphine for long spin coherence times of perfectly aligned NV centers
• Spin qubit based on the nitrogen-vacancy center analog in a diamond-like compound C3BN
• Optimization of a quantum control sequence for initializing an NV spin register
• Efficient Analysis of Photoluminescence Images for the Classification of Single-Photon Emitters
• Microscale Sensing with Strongly Interacting NV Ensembles at High Fields