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単一光子源
単一光子光源
The high- performance single-photon source based on this method of using carbon nanotubes will be a new technique that will lead to the development of inexpensive and highly integrated general-purpose quantum information devices in the field of quantum information, which includes quantum cryptography.
A timing adjuster (202) outputs the messenger signal, as a trigger signal, in synchronism with a clock signal used to pulse drive the pulse-driven messenger single-photon source (201).
In a quantum encryption transmitter apparatus (200), a pulse-driven messenger single-photon source (201) generates a pair of photons, one of which is outputted as a quantum signal and the other of which is outputted as a messenger signal.
Single photons, in which the number of photons contained in a pulse is restricted to one, have recently been attracting attention in quantum information devices such as those for quantum cryptography. To realize highly integrated general-purpose quantum information devices, there is a need for a single-photon source that can generate highly pure and highly efficient single photons at room temperature in the telecommunication wavelength band.
In order to make this technology widely and universally popular in the future, it is essential to produce inexpensive and highly integrable quantum information devices. It is also desirable to develop a single-photon source that is highly integrable on silicon chips, which can be combined with elements such as an optical integrated circuit called silicon photonics.
This group noticed that the nitgrogen-vacancy center (N-V center) in a diamond emits a stable photon at room temperature and tried driving it with an electric current using N-V center as a single-photon source.
An antibunching observed by photon correlation spectroscopy verified the emission from the N-V center, showing the N-V center works as a single-photon source.
In this case, N-V center is expected to play not a role of a single-photon source but a role of a quantum repeater.
この場合、NV中心は単一光子源としてではなく、量子中継器としての機能を果たすことも期待されます。
However, it is difficult to generate single photons with both high purity and high efficiency with the current single-photon source, and the development of a technique that can fulfil both of these conditions for practical applications in quantum information devices is highly sought after.
An efficient and high-quality single-photon source is thought to be necessary to realize quantum key distribution, quantum repeaters and photonic quantum information processing.
また、効率的、高品質の単一発光源は量子情報等の実現にとって不可欠と考えられている。
This group, by making use of single emission centers (N-V center) in diamond as single-photon sources, succeeded, for the first time in the world, in verifying the generation of single-photon source at room temperature in an electrically driven solid-state device that requires high integration and energy-saving for practical use.
High-efficiency single-photon generation via large-scale active time multiplexing| Frontier Research Institute for Interdisciplinary Sciences Assistant professor Fumihiro Kaneda at FRIS, Tohoku University and Professor Paul Kwiat at University of Illinois have built the world's most efficient single-photon source.
金田文寛 助教『Science Advances』誌に論文掲載|東北大学 学際科学フロンティア研究所 - Frontier Research Institute for Interdisciplinary Sciences 新領域創成研究部の金田文寛助教、イリノイ大学アーバナ・シャンペーン校のPaul Kwiat教授らのグループは、時間多重化法と呼ばれる手法により、世界最高の効率をもつ単一光子発生源の開発に成功しました。
We successfully demonstrated a quantum cryptography experiment using a single-photon source for the first time.
今回、スタンフォード大学と協力し、世界で初めて単一光子光源を用いた量子暗号実験に成功した。
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