arXiv subjects

Li-Ming Si

Publications and source records attributed to Li-Ming Si.

2 recordsLinked to original sources

arXiv2008

Quantum phase transition and entanglement in Li atom system

In this paper we study the quantum phase transition and entanglement in s1=1/2 and s2=1 spin pair system by the exact diagonalization method. We show that, for this exactly solvable quantum bi-spin system, entanglement appears before quantum phase transition and disappears after it. Moreover, we show that the von Neumann entropy, as a measure of entanglement, can reveal quantum phase transition in this system.

quant-ph↗

arXiv2007

Improved Time Domain Method to Measure Near-Field Distribution of Buried-Object

The paper analyses the ground antenna echo using microwave frequency detector and high speed sampling technology and a new method detecting buried object in time domain near-field is presented. The method detecting particular reflection echo frequency of microwave pulse via digital signal processing is to reduce the false alarm rate. Simulation results show that this method has advantages of easy identification and high precision.

physics.class-ph↗