Zero-dynamics principle for perfect quantum memory in linear networks

Naoki Yamamoto, Matthew R. James

研究成果: Article査読

33 被引用数 (Scopus)


In this paper, we study a general linear networked system that contains a tunable memory subsystem; that is, it is decoupled from an optical field for state transportation during the storage process, while it couples to the field during the writing or reading process. The input is given by a single photon state or a coherent state in a pulsed light field. We then completely and explicitly characterize the condition required on the pulse shape achieving the perfect state transfer from the light field to the memory subsystem. The key idea to obtain this result is the use of zero-dynamics principle, which in our case means that, for perfect state transfer, the output field during the writing process must be a vacuum. A useful interpretation of the result in terms of the transfer function is also given. Moreover, a four-node network composed of atomic ensembles is studied as an example, demonstrating how the input field state is transferred to the memory subsystem and what the input pulse shape to be engineered for perfect memory looks like.

ジャーナルNew Journal of Physics
出版ステータスPublished - 2014 7月

ASJC Scopus subject areas

  • 物理学および天文学一般


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