Open AccessThe spatial degrees of freedom of MIMO quantum channels
Author(s) -
Hailin Xiao,
Shan Ouyang,
Zaiping Nie
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.3685
Subject(s) - quantum key distribution , degrees of freedom (physics and chemistry) , mimo , computer science , quantum capacity , quantum information science , quantum , physics , quantum information , quantum mechanics , quantum network , statistical physics , telecommunications , quantum entanglement , channel (broadcasting)
Quantum communication is a process of quantum key distribution QKD. Current QKD technology restricts communication to a low bit rate. To improve the QKD bit rate and develop high rate and capacity, we propose a multiple-input-multiple-output quantum key distribution system. However, quantum field itself inevitably involves quantum noise which is determined by the quantum mechanics , which restrains the increase of capacity, and limits space resource utilization, that is, the problem of spatial degrees of freedom arises. The quantumization of the photon field and the electromagnetic wave equation satisfying the Schrdinger equation condition are adopted to investigate the upper bound of the spatial degrees of freedom for MIMO quantum channels, which will provide theoretical support and technical basis for developing robust space time processing algorithm for MIMO quantum communication and designing high performance systems.