740 citations · 2k across the 28 of their papers we have counts for
28 papers
Optimal noisy quantum phase estimation with finite-dimensional states
Jin-Feng Qin, Jing Liu
Phase estimation in quantum interferometry is a major scenario where the quantum advantage is significantly revealed. Recently, the optimal finite-dimensional probe states (OFPSs)…
Lee-Yang zeros and quantum Fisher information matrix in a nonlinear system
Hong Tao, Yuguo Su, Xingyu Zhang +2
The distribution of Lee-Yang zeros not only matters in thermodynamics and quantum mechanics, but also in mathematics. Hereby we propose a nonlinear quantum toy model and discuss th…
Quantum speed limit for complex dynamics
Mao Zhang, Huai-Ming Yu, Jing Liu
Quantum speed limit focuses on the minimum time scale for a fixed mission and hence is important in quantum information where fast dynamics is usually beneficial. Most existing too…
QuanEstimation: An open-source toolkit for quantum parameter estimation
Mao Zhang, Huai-Ming Yu, Haidong Yuan +3
Quantum parameter estimation promises a high-precision measurement in theory, however, how to design the optimal scheme in a specific scenario, especially under a practical conditi…
Optimal Scheme for Quantum Metrology
Jing Liu, Mao Zhang, Hongzhen Chen +2
Quantum metrology can achieve far better precision than classical metrology, and is one of the most important applications of quantum technologies in the real world. To attain the…
Single-photon-triggered spin squeezing with decoherence reduction in optomechanics via phase matching
Zhucheng Zhang, Lei Shao, Wangjun Lu +4
Quantum spin squeezing is an important resource for quantum information processing, but its squeezing degree is not easy to preserve in an open system with decoherence. Here, we pr…
Bhatia-Davis formula in the quantum speed limit
Jing Liu, Zibo Miao, Libin Fu +1
The Bhatia-Davis theorem provides a useful upper bound for the variance in mathematics, and in quantum mechanics, the variance of a Hamiltonian is naturally connected to the quantu…
Quantum metrology with precision reaching beyond- scaling through -probe entanglement generating interactions
Xing Deng, Shou-Long Chen, Mao Zhang +7
Nonlinear interactions are recognized as potential resources for quantum metrology, facilitating parameter estimation precisions that scale as the exponential Heisenberg limit of $…
Generation and storage of spin squeezing via learning-assisted optimal control
Qing-Shou Tan, Mao Zhang, Yu Chen +2
The generation and storage of spin squeezing is an attracting topic in quantum metrology and the foundations of quantum mechanics. The major models to realize the spin squeezing ar…
Fluctuation-enhanced quantum metrology
Yu Chen, Hongzhen Chen, Jing Liu +2
The main obstacle for practical quantum technology is the noise, which can induce the decoherence and destroy the potential quantum advantages. The fluctuation of a field, which in…
Operational definition of a quantum speed limit
Yanyan Shao, Bo Liu, Mao Zhang +2
The quantum speed limit is a fundamental concept in quantum mechanics, which aims at finding the minimum time scale or the maximum dynamical speed for some fixed targets. In a larg…
Quantum Fisher information matrix and multiparameter estimation
Jing Liu, Haidong Yuan, Xiao-Ming Lu +1
Quantum Fisher information matrix (QFIM) is a core concept in theoretical quantum metrology due to the significant importance of quantum Cramér-Rao bound in quantum parameter estim…
Multiqubit matter-wave interferometry under decoherence and the Heisenberg scaling recovery
Yanming Che, Jing Liu, Xiao-Ming Lu +1
Most matter-wave interferometry (MWI) schemes for quantum sensing are so far evaluated in ideal situations without noises. In this work, we provide assessments of generic multiqubi…
Control-enhanced multiparameter quantum estimation
Jing Liu, Haidong Yuan
Most studies in multiparameter estimation assume the dynamics is fixed and focus on identifying the optimal probe state and the optimal measurements. In practice, however, controls…
Valid lower bound for all estimators in quantum parameter estimation
Jing Liu, Haidong Yuan
The widely used quantum Cramer-Rao bound (QCRB) sets a lower bound for the mean square error of unbiased estimators in quantum parameter estimation, however, in general QCRB is onl…
Quantum parameter estimation with optimal control
Jing Liu, Haidong Yuan
A pivotal task in quantum metrology, and quantum parameter estimation in general, is to de- sign schemes that achieve the highest precision with given resources. Standard models of…
Maximal quantum Fisher information for general su(2) parametrization processes
Xiao-Xing Jing, Jing Liu, Heng-Na Xiong +1
Quantum Fisher information is a key concept in the field of quantum metrology, which aims to enhance the parameter accuracy by using quantum resources. In this paper, utilizing a r…
Quantum Fisher information and symmetric logarithmic derivative via anti-commutators
Jing Liu, Jie Chen, Xiao-Xing Jing +1
Symmetric logarithmic derivative (SLD) is a key quantity to obtain quantum Fisher information (QFI) and to construct the corresponding optimal measurements. Here we develop a metho…
Maximal quantum Fisher information for phase estimation without initial parity
Xu Yu, Xiang Zhao, Luyi Shen +3
Mach-Zehnder interferometer is a common device in quantum phase estimation and the photon losses in it are an important issue for achieving a high phase accuracy. Here we thoroughl…
Quantifying non-Markovianity for a chromophore-qubit pair in a super-Ohmic bath
Jing Liu, Kewei Sun, Xiaoguang Wang +1
An approach based on a non-Markovian time-convolutionless polaron master equation is used to probe the quantum dynamics of a chromophore-qubit in a super-Ohmic bath. Utilizing a me…
Quantum multiparameter metrology with generalized entangled coherent state
Jing Liu, Xiao-Ming Lu, Zhe Sun +1
We propose a generalized form of entangled coherent states (ECS) and apply them in a multi-arm optical interferometer to estimate multiple phase shifts. We obtain the quantum Crame…
Quantum metrology with unitary parametrization processes
Jing Liu, Xiaoxing Jing, Xiaoguang Wang
Quantum Fisher information is a central quantity in quantum metrology. We discuss an alternative representation of quantum Fisher information for unitary parametrization processes.…
Fidelity susceptibility and quantum Fisher information for density operators with arbitrary ranks
Jing Liu, Heng-Na Xiong, Fei Song +1
Taking into account the density matrices with non-full ranks, we show that the fidelity susceptibility is determined by the support of the density matrix. Combining with the corres…
Quantum Fisher information for density matrices with arbitrary ranks
Jing Liu, Xiao-Xing Jing, Wei Zhong +1
We provide a new expression of the quantum Fisher information(QFI) for a general system. Utilizing this expression, the QFI for a non-full rank density matrix is only determined by…