266 citations · 1.1k across the 24 of their papers we have counts for
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Resource-efficient Direct Characterization of General Density Matrix
Liang Xu, Mingti Zhou, Runxia Tao +12
Sequential weak measurements allow the direct extraction of individual density-matrix elements instead of globally reconstructing the whole density matrix, opening a new avenue for…
Online optimization for optical readout of a single electron spin in diamond
Xue Lin, Jingwei Fan, Runchuan Ye +4
The nitrogen-vacancy (NV) center in diamond has been developed as a promising platform for quantum sensing, especially for magnetic field measurements in the nano-tesla range with…
Sensitivity-enhanced magnetometry using nitrogen-vacancy ensembles via adaptively complete transitions overlapping
Bao Chen, Bing Chen, Xinyi Zhu +3
Nitrogen-vacancy (NV) centers in diamond are suitable sensors of high-sensitivity magnetometry which have attracted much interest in recent years. Here, we demonstrate sensitivity-…
Preserving Entanglement in a Solid-Spin System Using Quantum Autoencoders
Feifei Zhou, Yu Tian, Yumeng Song +6
Entanglement, as a key resource for modern quantum technologies, is extremely fragile due to the decoherence. Here, we show that a quantum autoencoder, which is trained to compress…
Mixed-signal data acquisition system for optically detected magnetic resonance of solid-state spins
Feifei Zhou, Shupei Song, Yuxuan Deng +3
We report a mixed-signal data acquisition (DAQ) system for optically detected magnetic resonance (ODMR) of solid-state spins. This system is designed and implemented based on a Fie…
Noise prediction and reduction of single electron spin by deep-learning-enhanced feedforward control
Nanyang Xu, Feifei Zhou, Xiangyu Ye +7
Noise-induced control imperfection is an important problem in applications of diamond-based nano-scale sensing, where measurement-based strategies are generally utilized to correct…
Machine-learning-assisted electron-spin readout of nitrogen-vacancy center in diamond
Peng Qian, Xue Lin, Feifei Zhou +5
Machine learning is a powerful tool in finding hidden data patterns for quantum information processing. Here, we introduce this method into the optical readout of electron-spin sta…
Calibration-Free Vector Magnetometry Using Nitrogen-Vacancy Center in Diamond Integrated with Optical Vortex Beam
Bing Chen, Xianfei Hou, Feifei Ge +7
We report a new method to determine the orientation of individual nitrogen-vacancy (NV) centers in a bulk diamond and use them to realize a calibration-free vector magnetometer wit…
Digital Quantum Simulation of Floquet Topological Phases with a Solid-State Quantum Simulator
Bing Chen, Shuo Li, Xianfei Hou +6
Quantum simulator with the ability to harness the dynamics of complex quantum systems has emerged as a promising platform for probing exotic topological phases. Since the flexibili…
Detecting dynamical quantum phase transition via out-of-time-order correlations in a solid-state quantum simulator
Bing Chen, Xianfei Hou, Feifei Zhou +3
Quantum many body system in equilibrium can be effectively characterized using the framework of quantum statistical mechanics. However, nonequilibrium behaviour of quantum many bod…
Pulse-width-induced polarization enhancement of optically-pumped N-V electron spin in diamond
Yumeng Song, Yu Tian, Zhiyi Hu +7
The nitrogen-vacancy (N-V) center in diamond is a widely-used platform for quantum information processing and metrology. The electron-spin state of N-V center could be initialized…
Quantum state tomography of a single electron spin in diamond with Wigner reconstruction
Bing Chen, Jianpei Geng, Feifei Zhou +3
We present the experimental reconstruction of the Wigner function of an individual electronic spin qubit associated with a nitrogen-vacancy (NV) center in diamond at room temperatu…
Dynamically Polarizing Spin Register of NV Centers in Diamond using Chopped Laser Pulses
Nanyang Xu, Yu Tian, Bing Chen +4
Nuclear spins nearby nitrogen-vacancy (NV) centers in diamond are excellent quantum memory for quantum computing and quantum sensing, but are difficult to be initialized due to the…
Wavelet-based fast time-resolved magnetic sensing with electronic spins in diamond
Nanyang Xu, Fengjian Jiang, Yu Tian +6
Time-resolved magnetic sensing is of great importance from fundamental studies to applications in physical and biological sciences. Recently the nitrogen-vacancy (NV) defect center…
Experimental Realization of Quantum Artificial Intelligence
Li Zhaokai, Liu Xiaomei, Xu Nanyang +1
Machines are possible to have some artificial intelligence like human beings owing to particular algorithms or software. Such machines could learn knowledge from what people taught…
Coherence-protected Quantum Gate by Continuous Dynamical Decoupling in Diamond
Xiangkun Xu, Zixiang Wang, Changkui Duan +8
To implement reliable quantum information processing, quantum gates have to be protected together with the qubits from decoherence. Here we demonstrate experimentally on nitrogen-v…
Quantum Discord for Investigating Quantum Correlations without Entanglement in Solids
Xing Rong, Zixiang Wang, Fangzhou Jin +7
Quantum systems unfold diversified correlations which have no classical counterparts. These quantum correlations have various different facets. Quantum entanglement, as the most we…
Quantum Factorization of 143 on a Dipolar-Coupling NMR system
Nanyang Xu, Jing Zhu, Dawei Lu +3
Quantum algorithms could be much faster than classical ones in solving the factoring problem. Adiabatic quantum computation for this is an alternative approach other than Shor's al…
Simulation of chemical reaction dynamics on an NMR quantum computer
Dawei Lu, Nanyang Xu, Ruixue Xu +4
Quantum simulation can beat current classical computers with minimally a few tens of qubits and will likely become the first practical use of a quantum computer. One promising appl…
Room-temperature implementation of the Deutsch-Jozsa algorithm with a single electronic spin in diamond
Fazhan Shi, Xing Rong, Nanyang Xu +9
The nitrogen-vacancy defect center (NV center) is a promising candidate for quantum information processing due to the possibility of coherent manipulation of individual spins in th…
Implementation of a Quantum-simulation Algorithm of Calculating Molecular Ground-state Energy on an NMR Quantum Computer
Jiangfeng Du, Nanyang Xu, Xinhua Peng +3
It is exponentially hard to simulate quantum systems by classical algorithms, while quantum computer could in principle solve this problem polynomially. We demonstrate such an quan…
Complete Adiabatic Quantum Search in Unsorted Databases
Nanyang Xu, Xinhua Peng, Mingjun Shi +1
We propose a new adiabatic algorithm for the unsorted database search problem. This algorithm saves two thirds of qubits than Grover's algorithm in realizations. Meanwhile, we anal…
A Non-Oracle Quantum Search Algorithm and Its Experimental Implementation
Nanyang Xu, Jin Zhu, Xinhua Peng +2
Grover's algorithm has achieved great success. But quantum search algorithms still are not complete algorithms because of Grover's Oracle. We concerned on this problem and present…
A Quantum Adiabatic Algorithm for Factorization and Its Experimental Implementation
Xinhua Peng, Zeyang Liao, Nanyang Xu +4
We propose an adiabatic quantum algorithm capable of factorizing numbers, using fewer qubits than Shor's algorithm. We implement the algorithm in an NMR quantum information process…