A new source of single photons for quantum cryptography, qubits and more. Uniqueness of the development
It is the demonstration of high purity of single-photon inThe infrared range has direct applications in areas such as quantum key distribution for secure communications, explains Viktor Klimov. He is the lead author of a paper published in the journal Nature Nanotechnology.
To create quantum dots (pillboxes) emittingsingle photons, scientists used the synthesis in solution of colloidal nanoparticles. The quantum dots obtained in the course of chemical processes are a cadmium selenide core in a cadmium sulfide shell. To convert such structures into single photon emitters, the researchers inserted a layer of mercury sulfide between the shell and the core. It turned out that a simple increase in the thickness of the interlayer discretely changes the wavelength of the photon radiation.
Zachary (Zack) Robinson (left) and Vladimir Saevich (right) are part of the team that developed these infrared emitting quantum dots.
New structures are far superior to existing onesNear-infrared quantum dots, these new structures exhibit "unblinking" high-speed emission at the single-dot level, near-perfect single-photon purity at room temperature (which produces "quantum light"). They are stable under both optical and electrical excitation.
“This is just the first step.To make full use of “quantum light”, it is necessary to achieve the indistinguishability of photons. That is, make sure that all emitted photons are quantum mechanically identical. This is an extremely difficult task, which we will tackle further in our project,” concludes Viktor Klimov.
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