Entanglement Swapping and Swapped Entanglement

Zangi, Sultan M.1; Shukla, Chitra2; Ur Rahman, Atta3; Zheng, Bo1,4

2023-03-01

10.3390/e25030415

ENTROPY   Impact Factor & Quartile

1099-4300

Entanglement swapping is gaining widespread attention due to its application in entanglement distribution among different parts of quantum appliances. We investigate the entanglement swapping for pure and noisy systems, and argue different entanglement quantifiers for quantum states. We explore the relationship between the entanglement of initial states and the average entanglement of final states in terms of concurrence and negativity. We find that if initial quantum states are maximally entangled and we make measurements in the Bell basis, then average concurrence and average negativity of final states give similar results. In this case, we simply obtain the average concurrence (average negativity) of the final states by taking the product of concurrences (negativities) of the initial states. However, the measurement in non-maximally entangled basis during entanglement swapping degrades the average swapped entanglement. Further, the product of the entanglement of the initial mixed states provides an upper bound to the average swapped entanglement of final states obtained after entanglement swapping. The negativity work well for weak entangled noisy states but concurrence gives better results for relatively strong entanglement regimes. We also discuss how successfully the output state can be used as a channel for the teleportation of an unknown qubit.

entanglement swapping negativity concurrence

SCI

English

Others

Postdoctoral training funds[C615300501] ; National Natural Science Foundation of China[12175193]

Physics

Physics, Multidisciplinary

WOS:000958073200001

MDPI

Web of Science

1.Yunnan Univ, Sch Phys & Astron, Yunnan Key Lab Quantum Informat, Kunming 650500, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Dept Phys, Shenzhen 518055, Peoples R China
3.Univ Chinese Acad Sci, Sch Phys, Yuquan Rd 19A, Beijing 100049, Peoples R China
4.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China

Zangi, Sultan M.,Shukla, Chitra,Ur Rahman, Atta,et al. Entanglement Swapping and Swapped Entanglement[J]. ENTROPY,2023,25(3).

Zangi, Sultan M.,Shukla, Chitra,Ur Rahman, Atta,&Zheng, Bo.(2023).Entanglement Swapping and Swapped Entanglement.ENTROPY,25(3).

Zangi, Sultan M.,et al."Entanglement Swapping and Swapped Entanglement".ENTROPY 25.3(2023).