| The solid-state electron spin caused by structural defects in diamond has always been the focus of research.Nitrogen-vacancy color center,referred to as NV color center,has become a test platform for various quantum technologies due to its long coherence time at room temperature,optical initialization and readout,and microwave control.NV color centers have broad prospects in the fields of quantum computing,precision magnetic field measurement,quantum registers,and biophysics.This article focuses on the development of NV color centers in quantum computing and quantum networks and corresponding technologies.The most widely known quantum circuit model of quantum computing requires single-bit and two-bit gates that can physically achieve high fidelity,as well as the scalability of qubits.In previous researchs NV color centers can only perform two-bit operations with neighboring nuclear spins,and the number of neighboring nuclear spins is obviously not scalable.Here,entanglement generation via an ultra-fast two-qubit gate based on the electrical dipole coupling of two neighboring NV color centers is proposed.The fidelity of C-NOT operation can reach 98.88%,and the execution time of gate operation is about hundred nanoseconds,which is two orders of magnitude faster than the traditional phase accumulation scheme.The gate operation and expansion scheme fill the blank of fast two-bit operation between NV color centers.Regarding the development of NV color centers in quantum networks,this article focuses on the theory and technology of how to generate entanglement between two NV color centers at a distance,studies and analyzes the theoretical scheme of entanglement generation,and explores how to use optical cavity And cavity length stabilization technology,such as quasi-zero stiffness passive vibration isolation technology and PDH negative feedback cavity stabilization technology,enhances the zero-phonon radiation efficiency. |
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