Details

Autor(en) / Beteiligte

• Li, Yong-Qiang
• Li, Xiang
• Jia, Xiang-Fu
• Yang, Guo-Hui

Titel

Quantum Dense Coding Properties Between Two Spatially Separated Atoms in Free Space

Ist Teil von

• International journal of theoretical physics, 2020-11, Vol.59 (11), p.3378-3386

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2020

Quelle

SpringerLink

Beschreibungen/Notizen

• Quantum dense coding properties between two identical and spatially separated atoms in free space with different initial states is investigated. It shows that dense coding capacity χ experienced a sharp decline firstly and then gradually increased to be one steady value 1 with increasing Γ t . The realization of dense coding capacity χ is found to be strongly dependent on the initial states. It is worth noting that the initial pure state | e e 〉 is not useful for dense coding in this system, due to the dense coding capacity χ is always less than 1(a valid dense coding capacity satisfies χ > 1). Otherwise, for the initial entangled state and mixed state, one can obtain the valid dense coding capacity, the results show that one threshold value of t c is exists, and when t < t c the dense coding capacity is valid. Tuning the atomic distance between the two atoms slightly broaden the valid dense coding region and improve the value of t c . Decreasing the purity a of initial states not only broaden the region but also prolong the effective time where one can carry out the valid dense coding successfully.