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Physicist develops new photon source for tap-proof communication

New method for generating quantum-entangled photons in a spectral range of light previously inaccessible developed

Date:
March 27, 2020
Source:
Cluster of Excellence PhoenixD / Leibniz University Hannover
Summary:
An international team has developed a new method for generating quantum-entangled photons in a spectral range of light that was previously inaccessible. The discovery can make the encryption of satellite-based communications much more secure in the future.
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An international team with the participation of Prof. Dr. Michael Kues from the Cluster of Excellence PhoenixD at Leibniz University Hannover has developed a new method for generating quantum-entangled photons in a spectral range of light that was previously inaccessible. The discovery can make the encryption of satellite-based communications much more secure in the future.

A 15-member research team from the UK, Germany and Japan has developed a new method for generating and detecting quantum-entangled photons at a wavelength of 2.1 micrometres. In practice, entangled photons are used in encryption methods such as quantum key distribution to completely secure telecommunications between two partners against eavesdropping attempts. The research results are presented to the public for the first time in the current issue ofScience Advances.

Until now, it has been only technically possible to implement such encryption mechanisms with entangled photons in the near-infrared range of 700 to 1550 nanometers. However, these shorter wavelengths have disadvantages, especially in satellite-based communication: They are disturbed by light-absorbing gases in the atmosphere as well as the background radiation of the sun. With the existing technology, end-to-end encryption of transmitted data can only be guaranteed at night, but not on sunny and cloudy days.

The international team, led by Dr. Matteo Clerici from the University of Glasgow, wants to solve this problem with its discovery. The photon pairs entangled at two micrometre wavelength would be significantly less influenced by the solar background radiation, says Prof. Dr. Michael Kues from the PhoenixD Cluster of Excellence at Leibniz University of Hannover. In addition, so-called transmission windows exist in the earth's atmosphere, especially for wavelengths of two micrometers, so that the photons are less absorbed by the atmospheric gases, in turn allowing a more effective communication.

为他们的实验中,研究人员使用一种nonlinear crystal made of lithium niobate. They sent ultrashort light pulses from a laser into the crystal and a nonlinear interaction produced the entangled photon pairs with the new wavelength of 2.1 micrometres.

The research results published in the journalScience Advances描述的实验系统的细节d the verification of the entangled photon pairs: "The next crucial step will be to miniaturize this system by converting it into photonic integrated devices, making it suitable for mass production and for the use in other application scenarios," says Kues.

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Story Source:

Materialsprovided byCluster of Excellence PhoenixD / Leibniz University Hannover.注意:内容可能被编辑风格d length.


Journal Reference:

  1. Shashi Prabhakar, Taylor Shields, Adetunmise C. Dada, Mehdi Ebrahim, Gregor G. Taylor, Dmitry Morozov, Kleanthis Erotokritou, Shigehito Miki, Masahiro Yabuno, Hirotaka Terai, Corin Gawith, Michael Kues, Lucia Caspani, Robert H. Hadfield, Matteo Clerici.Two-photon quantum interference and entanglement at 2.1 μm.Science Advances, 2020; 6 (13): eaay5195 DOI:10.1126/sciadv.aay5195

Cite This Page:

Cluster of Excellence PhoenixD / Leibniz University Hannover. "Physicist develops new photon source for tap-proof communication: New method for generating quantum-entangled photons in a spectral range of light previously inaccessible developed." ScienceDaily. ScienceDaily, 27 March 2020. .
Cluster of Excellence PhoenixD / Leibniz University Hannover. (2020, March 27). Physicist develops new photon source for tap-proof communication: New method for generating quantum-entangled photons in a spectral range of light previously inaccessible developed.ScienceDaily. Retrieved June 28, 2023 from www.koonmotors.com/releases/2020/03/200327161724.htm
Cluster of Excellence PhoenixD / Leibniz University Hannover. "Physicist develops new photon source for tap-proof communication: New method for generating quantum-entangled photons in a spectral range of light previously inaccessible developed." ScienceDaily. www.koonmotors.com/releases/2020/03/200327161724.htm (accessed June 28, 2023).

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