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New Quantum Light Source Paves the Way to a Quantum Internet

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science

Conventional light sources for fiber optic communications emit many photons simultaneously. A photon is a particle of light that travels as a wave. In today’s telecommunications networks, information is transmitted by modulating the properties of light waves traveling through optical fibers, much like radio waves are modulated in AM and FM channels. However, in quantum communication, information is encoded in the phase of a single photon (the position of the photon within the wave in which it travels). This will allow us to connect quantum sensors in networks that span long distances, connection Quantum computer together. Researchers recently fabricated a single-photon source with an operating wavelength compatible with existing fiber communication networks. They did so by placing a semiconducting layer of molybdenum ditelluride over the array just an atom thick. Nano– Pillars of size. This is the first time researchers have demonstrated this type of tunable light source suitable for use in a communication system.

impact

The results of this work make it possible for the first time to integrate quantum light sources made of two-dimensional materials into existing communication networks. Moreover, the two-dimensional nature of the material facilitates building the device layer by layer.This helps integrate these light sources into new quantum computer Build larger modular computing systems to achieve quantum advantage for practical applications.

Overview

The ability to integrate fiber-based quantum information technology into existing optical networks will be an important step towards its application to quantum communications. To achieve this, quantum light sources generate single photons with controllable position and polarization in the 1.35 and 1.55 micrometer range where light travels with minimal loss in existing fiber optic networks, such as telecommunication networks. must be able to emit This combination of features has been elusive until now, despite 20 years of research effort. Two-dimensional (2D) semiconductors have recently emerged as a new platform for next-generation photonics and electronics applications. The scientist has demonstrated his 2D quantum emitter operating in the visible range, but single-photon emission in the most desirable communication band has never been achieved in his 2D system. To solve this problem, researchers at Los Alamos National Laboratory have developed a strain-engineered protocol that deterministically creates his two-dimensional quantum emitters with tunable operating wavelengths across the O and C communication bands. Did. The polarization of the emission can be tuned with a magnetic field by exploiting the valley degrees of freedom. The researchers obtained a single-photon purity of 90% and an operating temperature of 77 Kelvin. These groundbreaking results open the door to exciting developments in quantum technology.

fundraising

This work was supported by the Department of Energy’s Office of Science, Office of Science’s Fundamental Energy Science Program. Institute-led research and development program. Quantum Science Center at Oak Ridge National Laboratory, the National Center for Quantum Information Science. Postdoctoral Fellow Award for Institute Director.

Journal Link: Nature Communications

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