Last years Nobel Prize in Physics commemorated the basic interest of quantum entanglement, and also envisioned the possible applications in “the 2nd quantum transformation”– a brand-new age when we are able to manipulate the weirdness of quantum mechanics, including quantum superposition and entanglement. A massive and totally practical quantum network is the holy grail of quantum details sciences. A high-performance quantum network needs not only ultra-low-loss quantum channels and quantum memory, but also high-performance quantum light sources. There has been interesting recent progress in satellite-based quantum interactions and quantum repeaters, but an absence of ideal single-photon sources has hindered further advances.
Experimental configuration of quantum disturbance between two independent solid-state QD single-photon sources separated by 302 km fiber.
In a recent research study, scientists accomplished high-visibility quantum disturbance between two independent semiconductor quantum dots, an essential advancement towards scalable quantum networks.
Scientist demonstrated high-visibility quantum disturbance in between 2 independent semiconductor quantum dots– a crucial step toward scalable quantum networks.
In 2015s Nobel Prize in Physics celebrated the basic interest of quantum entanglement, and likewise envisioned the possible applications in “the 2nd quantum transformation”– a new age when we are able to control the weirdness of quantum mechanics, consisting of quantum superposition and entanglement. A fully practical and large-scale quantum network is the holy grail of quantum info sciences. It will open a brand-new frontier of physics, with new possibilities for quantum computation, interaction, and metrology.
A high-performance quantum network needs not only ultra-low-loss quantum channels and quantum memory, but likewise high-performance quantum light sources. There has actually been exciting current progress in satellite-based quantum interactions and quantum repeaters, however a lack of ideal single-photon sources has actually obstructed further advances.
Experimental configuration of quantum interference between two independent solid-state QD single-photon sources separated by 302 km fiber. DM: dichromatic mirror, LP: long pass, BP: band pass, BS: beam splitter, SNSPD: superconducting nanowire single-photon detector, HWP: half-wave plate, QWP: quarter-wave plate, PBS: polarization beam splitter.
What is required of a single-photon source for quantum network applications? Third, for applications such as in quantum teleportation that require interfering with independent photons, the single photons ought to be indistinguishable.
A promising source is quantum dots (QDs), semiconductor particles of simply a couple of nanometers. In the previous 2 years, the exposure of quantum disturbance in between independent QDs has actually hardly ever exceeded the classical limit of 50% and distances have actually been restricted to around a few meters or kilometers.
As reported in Advanced Photonics, an international group of researchers has actually achieved high-visibility quantum interference in between 2 independent QDs connected with ~ 300 km optical fibers. They report effective and indistinguishable single-photon sources with ultra-low-noise, tunable single-photon frequency conversion, and low-dispersion long fiber transmission. The single photons are generated from resonantly driven single QDs deterministically paired to microcavities. Quantum frequency conversions are utilized to eliminate the QD inhomogeneity and shift the emission wavelength to the telecommunications band. The observed interference visibility depends on 93%. According to senior author Chao-Yang Lu, professor at the University of Science and Technology of China (USTC), “Feasible improvements can even more extend the range to ~ 600 km.”.
Lu remarks, “Our work jumped from the previous QD-based quantum experiments at a scale from ~ 1 km to 300 km, 2 orders of magnitude larger, and thus opens an interesting possibility of solid-state quantum networks.” With this reported dive, the dawn of solid-state quantum networks might quickly start breaking towards day.
Recommendation: “Quantum disturbance with independent single-photon sources over 300 km fiber” by Xiang You, Mingyang Zheng, Si Chen, Run-Ze Liu, Jian Qin, Mo-Chi Xu, Zheng-Xuan Ge, Tung-Hsun Chung, Yu-Kun Qiao, Yang-Fan Jiang, Han-Sen Zhong, Ming-Cheng Chen, Hui Wang, Yu-Ming He, Xiu-Ping Xie, Hao Li, Li-Xing You III, Christian Schneider, Juan Yin, Teng-Yun Chen, Mohamed Benyoucef, Yong-Heng Huo, Sven Höfling, Qiang Zhang, Chao-Yang Lu and Jian-Wei Pan, 27 December 2022, Advanced Photonics.DOI: 10.1117/ 1. AP.4.6.066003.