Single photon source based on single trapped ion

Abstract

The present invention discloses a single photon source based on a single trapped ion. The source comprises a vacuum chamber, an ion trap chip and a calcium atomic furnace. The ion trap chip comprises an arsenic silicate substrate, a first silicon dioxide layer and a second silicon dioxide layer. The arseno silicate substrate is provided with a substrate through hole, the opposite side walls of the substrate through hole are respectively provided with fiber fixing grooves, the two fiber fixing grooves are respectively provided with two multimode fibers having the same optical axis, the opposite end surfaces of the two multimode fibers are concave surfaces, the surfaces of the concave surfaces are provided with dielectric films, the focal points of the concave surfaces of the two multimode fibers are overlapped, and an optical microcavity is formed between the concave surfaces of the two multimode fibers. The single photon source based on the single trapped ion realizes the Doppler limitation cooling of the single ion. The single photon source has higher generation efficiency and facilitates the connection with the current optical communication system to allow the prepared single photon line width to reach the natural line width of ion energy level transition.

Description

technical field [0001] The invention relates to the technical field of quantum information processing, in particular to a single-photon source based on a single trapped ion, which can generate a single-photon output device, which improves the single-photon output efficiency, narrows the single-photon linewidth, and improves the transmission of quantum communication distance, and improve the security of quantum communication. Background technique [0002] Quantum properties have unique functions in the field of information, which may break through the limits of existing classical information systems in terms of increasing computing speed, ensuring information security, increasing information capacity, and improving detection accuracy, so a new branch of discipline was born - Quantum information science. It is the product of the combination of quantum mechanics and information science, including: quantum cryptography, quantum communication, quantum computing and quantum measu...

AI Technical Summary

Problems solved by technology

However, there are technical difficulties in efficiently coupling such photons into single-mode fibers due to mode matching.

At present, the announced efficiency of this single photon source is relatively low, especially when the bandwidth is less than 1nm, the current value of H is less than 0.5

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