標題: Carrying an arbitrarily large amount of information using a single quantum particle
作者: Hsu, Li-Yi
Lai, Ching-Yi
Chang, You-Chia
Wu, Chien-Ming
Lee, Ray-Kuang
電信工程研究所
光電工程學系
光電工程研究所
Institute of Communications Engineering
Department of Photonics
Institute of EO Enginerring
公開日期: 25-Aug-2020
摘要: Theoretically speaking, a photon can travel arbitrarily long before it enters into a detector, resulting in a click. How much information can a photon carry? We study a bipartite asymmetric "two-way signaling" protocol as an extension of that proposed by Del Santo and Dakic. Suppose that Alice and Bob are distant from each other and each of them has an n-bit string. They are tasked to exchange the information of their local n-bit strings with each other, using only a single photon during the communication. It has been shown that the superposition of different spatial locations in a Mach-Zehnder (MZ) interferometer enables bipartite local encodings. We show that, after the travel of a photon through a cascade of n-level MZ interferometers in our protocol, the one of Alice and Bob whose detector clicks can access the other's full information of the n-bit string, while the other can gain one bit of information. That is, the wave-particle duality makes two-way signaling possible, and a single photon can carry an arbitrarily large (but finite) amount of information.
URI: http://dx.doi.org/10.1103/PhysRevA.102.022620
http://hdl.handle.net/11536/155325
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.102.022620
期刊: PHYSICAL REVIEW A
Volume: 102
Issue: 2
起始頁: 0
結束頁: 0
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