Quantum repeaters: fundamental and future

Li, Yue; Hua, Sha; Liu, Yu; Ye, Jun; Zhou, Quan

doi:10.1117/12.717206

Cited by 2 publications

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“…In QKD systems, optical sources capable of highspeed modulation are also desirable, since they enable high-speed key transmission. This is of special interest due to the impossibility of optical amplification of the quantum states, albeit good progress is being made in the field of quantum repeaters [2]. Regarding operation frequency, laser diodes capable of high-speed modulation While λ~1550nm is, in terms of absorption in urban zones, the least attenuated in air (see Fig.…”

Section: Choice Of Wavelength and Source For The Transmittermentioning

confidence: 99%

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Free-Space Quantum Key Distribution

Carrasco‐Casado

Fernández

Denisenko

2016

Signals and Communication Technology

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Based on the firm laws of physics rather than unproven foundations of mathematical complexity, quantum cryptography provides a radically different solution for encryption and promises unconditional security. Quantum cryptography systems are typically built between two nodes connected to each other through fiber optic. This chapter focuses on quantum cryptography systems operating over free-space optical channels as a cost-effective and license-free alternative to fiber optic counterparts. It provides an overview of the different parts of an experimental free-space quantum communication link developed in the Spanish National Research Council (Madrid, Spain).Comment: 22 pages, 15 figure

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Section: Choice Of Wavelength and Source For The Transmittermentioning

confidence: 99%

“…In equation (1), IR is the detected intensity at a distance x from an initial Intensity I0, and γ is the attenuation coefficient. This attenuation coefficient is governed by two effects: the absorption and scattering coefficients (α and β, respectively) of molecules and aerosol particles present in the air, according to equation (2).…”

Section: E Imentioning

confidence: 99%