News on China's scientific and technological development.

America doesn't lead in quantum gravimeter. China does.

Here's an old post of mine on this strategic tech from last year. News on China's scientific and technological development.

Since then,

Institute of Electrical Engineering of CAS has developed their own superconducting quantum gravimeter. So, that's another team.

USTC built an atom gravimeter (USTC-AG11) that worked in a seismic station in Yunnan, for over five months. A continuous operational record. More importantly another team in China at the frontier.

Zhejiang University of Technology tested their quantum gravimeter in a shipborne experiment the Yellow Sea. They literally published their work this month.

Finally, Huazhong. Well, let's hear from their own mouth, from a few months ago.



So, a new SOTA record by a factor of 2.

Since America doesn't lead in quantum gravimeter then how can they lead in Quantum Sensors?

gpt said:

On the other hand, the US has a lead in:

• Quantum Sensors
• Atomic Clocks
• Gravitational Sensors

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I read in the space thread that China has been testing various types of cold atomic clocks in the Mengtian laboratory. Which I think is quite close to the leading edge, so how far back is China really in this field or is it something like the US simply producing more papers on the subject?

Shanghai Institute of Microsystems successfully developed a mobile high-efficiency superconducting single photon detection system　　​

Recently, the teams of Li Hao and You Lixing of the Shanghai Institute of Microsystems, Chinese Academy of Sciences, in cooperation with Futong Quantum Technology (Zhejiang) Co., Ltd., successfully developed a system based on a small liquid helium Dewar (working temperature 4.2K) with a detection efficiency of more than 1550nm in the 1550nm band. 70% of mobile superconducting single-photon detection systems paves the way for future high-performance single-photon detection applications based on mobile platforms (airborne, vehicle-mounted, etc.). The relevant research results are titled "Mobile superconducting strip photon detection system with efficiency over 70% at a 1550 nm wavelength)" and were published on Optics Express .
Superconducting strip photon detector (SSPD: Superconducting strip photon detector), as a high-performance single photon detector, is widely used in fields such as quantum information and weak light detection, and has effectively promoted scientific and technological progress in related fields. However, the comprehensive detection performance of SSPD significantly depends on the operating temperature of the device. The lower the temperature, the higher the system detection efficiency. So far, high-efficiency SSPD systems usually require the use of GM refrigerators (T ≤ 2.5 K), adsorption refrigerators (T ≤ 0.85 K) or even lower temperature refrigerators. The mass, volume, power consumption, etc. of these systems have become The key reasons that limit the application of SSPD in mobile platforms such as airborne. If a high-efficiency SSPD can be achieved at an operating temperature of 4.2K, a small liquid helium Dewar can be used to construct a small, low-power, short-time working superconducting single-photon detection system, providing a feasible solution for mobile platform applications such as drones and aviation. s solution.
The photoresponsiveness of SSPD is closely related to the disorder of superconducting film materials. Highly disordered superconducting film material control technology is used to achieve superconducting film materials with higher surface resistance. Enhancing the detection sensitivity of SSPD is a way to increase the operating temperature of SSPD. one. In this project, the researchers used NbTiN superconducting thin film materials with a surface resistance of over 600Ω to achieve SSPD with near-saturated detection efficiency at an operating temperature of 4.2K. At the same time, a small liquid helium Dewar dedicated to SSPD was developed and manufactured. Combined with a battery-based low-power circuit module, a mobile single-photon detection system with a detection efficiency of more than 70% was realized.
The first author of the paper is Zhang Xiaofu, an associate researcher at Shanghai Institute of Microsystems, and the second author is Ma Ruoyan, a doctoral candidate at Shanghai Institute of Microsystems. The corresponding authors are Zhang Xiaofu and You Lixing from Shanghai Institute of Microsystems. The research was supported by projects such as the National Natural Science Foundation of China and the Shanghai Sail Project

dingyibvs said:

Which is a misread of Huawei's actual publication, as you can see for yourself in the article. It says 1/30, not 1/30ms.

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NearLink application.

there are so many amazing products out of Huawei's unveiling and this smart glasses is pretty cool too.

Looks good and offers 11 hours of listening or 9 hours of communication, with fast charging & AR functionality I assume this uses Kirin A2 also (due to the need for advanced sound quality)
It can even monitor health by inspecting cervical spine

PopularScience said:

NearLink application.

Please, Log in or Register to view URLs content!

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That's really impressive, would be immediately noticeable if you use those pens often. It's so noticeable just by watching it. I wonder if it takes care of the audio lag issue as well for BT speakers/headphones.

tphuang said:

there are so many amazing products out of Huawei's unveiling and this smart glasses is pretty cool too.

Looks good and offers 11 hours of listening or 9 hours of communication, with fast charging & AR functionality I assume this uses Kirin A2 also (due to the need for advanced sound quality)

Please, Log in or Register to view URLs content!

It can even monitor health by inspecting cervical spine

Click to expand...

Dang, their models all narrow and sleek face. I am fat and round, wonder if they will be comfortable.

Robot installation data for 2022 dropped

this is interesting, telegram wants to build its wechat super app with help from Tencent

This is a software version of tech sharing, I guess

Huawei working with UAE telecom provider to complete 400G@Super C+L testing