Many-Body Entanglement

Xiang-Ping Liao, Mao-Fa Fang, Zheng Xiao-Juan +1 more

We study three-body entanglement induced by spontaneous emission in a three two-level atoms system by using the entanglement tensor approach. The results show that the amount of entanglement is strongly dependent on the initial state of the system and the species of atoms. The three-body entanglement is the result of the coherent superposition of the two-body entanglements. The larger the two-body entanglement is, the stronger the three-body entanglement is. On the other hand, if there exists a great difference in three two-body entanglement measures, the three-body entanglement is very weak. We also find that the maximum of the two-body entanglement obtained with nonidentical atoms is greater than that obtained with identical atoms via adjusting the difference in atomic frequency.

Jeff Hecht

Bi Si

The entangled state of quantum human body was studied surrounding the microcosmic field of digital human body. The main contents are the state of quantum human body and the entangled state of quantum human body. The former included the density functor, density matrix of quantum human body and the density matrix of mixed state of human body system. The last one included the self spinning entangled state of two particles in which the the quantum human body self spinning was 1/2 and Bell base, the photon polarization state and double photon entangled state of human body system, the fixed field feature and latent variable of human body system, the application of it in human body system information, the measurement of quantum human body state and Winger function. It provided theoretical and experimental gist for the microcosmic study of digital human body.

Zhiming Rao

In light of quantum theory,we investigate the entanglement properties of two entangled two-level atoms that interact resonantly with a single-mode vacuum field with atomic motion.The results show that if the two atoms are prepared in maximun entangled(EPR)state initially,the maximum of three-body entanglement measure is equated with the perfect three-body W entangled state.The parameter of field-mode structure p influences the time evolution osciuation property of three-body entlinglement measure,with the gradually increasing of p,the average of three-body entanglement measure will gradually decrease,three-body entangled state will tend to disentangled state inch by inch.