107 citations · 235 across the 15 of their papers we have counts for
10 papers · 1 filter
Optimal Quantum State Tomography via Weak Value
Xuanmin Zhu, Dezheng Zhang, Runping Gao +3
To improve the efficiency of the state tomography strategy via weak value, we have searched the optimal coupling strength between the system and measuring device. For an arbitrary…
Degenerate perturbation theory to quantum search
Dezheng Zhang, Xuanmin Zhu, Yuanchun Deng +3
We utilize degenerate perturbation theory to investigate continuous-time quantum search on second-order truncated simplex lattices. In this work, we show that the construction of t…
Hybrid direct state tomography by weak value
Xuanmin Zhu, Qun Wei, Lixia Liu +1
Compared with the conventional quantum state tomography (QST), the direct state tomography (DST) using weak value is easily manipulated in experiments. However, the efficiency of t…
Direct state reconstruction with coupling-deformed pointer observables
Xuanmin Zhu, Yu-Xiang Zhang, Shengjun Wu
Direct state tomography (DST) using weak measurements has received wide attention. Based on the concept of coupling-deformed pointer observables presented by Zhang \emph{et al}.[Ph…
The amplification of weak measurements under quantum noise
Xuanmin Zhu, Yu-Xiang Zhang
The influence of outside quantum noises on the amplification of weak measurements is investigated. Three typical quantum noises are discussed. The maximum values of the pointer's s…
Quantum Uncertainty and Error-Disturbance Tradeoff
Yu-Xiang Zhang, Shengjun Wu, Zeng-Bing Chen
The uncertainty principle is often interpreted by the tradeoff between the error of a measurement and the consequential disturbance to the followed ones, which originated long ago…
The negative probabilities and information gain in weak measurements
Xuanmin Zhu, Qun Wei, Quanhui Liu +1
We study the outcomes in a general measurement with postselection, and derive upper bounds for the pointer readings in weak measurement. Using the idea of weak measurement, we stud…
Information gain versus coupling strength in quantum measurements
Xuanmin Zhu, Yuxiang Zhang, Quanhui Liu +1
We investigate the relationship between the information gain and the interaction strength between the quantum system and the measuring device. A strategy is proposed to calculate t…
Quantum measurements with preselection and postselection
Xuanmin Zhu, Yuxiang Zhang, Shengshi Pang +3
We study quantum measurement with preselection and postselection, and derive the precise expressions of the measurement results without any restriction on the coupling strength bet…
The classicality and quantumness of a quantum ensemble
Xuanmin Zhu, Shengshi Pang, Shengjun Wu +1
In this paper, we investigate the classicality and quantumness of a quantum ensemble. We define a quantity called classicality to characterize how classical a quantum ensemble is.…