On December 16, Huawei launched the beta version of Hongmeng OS 2.0 mobile phone system as scheduled. P40 and mate 30 series can apply to participate in the test, mainly for developers.

At the press conference, Huawei displayed Huawei mobile phones that have upgraded Hongmeng OS to demonstrate the features of Hongmeng OS. From the experience point of view, this mobile phone is not different from the current emui developed by Huawei based on Android in terms of operation habits and interface design. In addition, Android apps can be freely downloaded and run in the built-in Huawei app store.

According to sina science and technology report, a field staff member said that the demonstration machine is only to show the distributed ability based on Hongmeng OS. The official version of Hongmeng OS in the future will definitely have a new interface design on mobile phones.
Many developers and media participating in the December 16 harmonyos 2.0 mobile phone developer beta event said that there are many differences between Hongmeng OS and Android system from the perspective of Huawei's relevant technical experts and on-site display functions.

According to Wang Chenglu, President of Huawei's consumer business software, "over the past five years, Huawei's software team has basically replaced the core parts of Android system From the underlying driver to the abstract layer of hardware, to the programming framework above Huawei, etc. We have changed everything we can.

Wang Chenglu has repeatedly stressed that Hongmeng OS was born not to replace Android, but to surpass Android and build the next generation operating system in the era of Internet of things

According to Xinhua news agency and others, some lunar samples collected by chang'e-5 were officially handed over. The lunar samples weighed 1731g. This also marks the beginning of China's first work on the storage, analysis and research of extraterrestrial objects, and the chang'e-5 mission has shifted from engineering implementation to scientific research.

The lunar samples brought back by chang'e-5 will be used for three purposes: first, scientific research; second, it will be displayed in the National Museum of Tibet for popular science education; third, according to international cooperation conventions and multilateral bilateral cooperation agreements, the lunar samples and data management measures will be shared with relevant scientists, and some samples may be sent as state gifts according to international practices.

There are many important roles in the study of lunar samples. It is of great significance to study the lunar surface interaction and lunar soil texture. The lunar sample stock is only 1731g, and part of the Lunar Sample for research purposes is unknown.
According to Zou Yongliao, director of the General Department of lunar and deep space exploration of the Chinese Academy of Sciences, it is of great significance to study the composition characteristics (rock type, mineral composition, chemical composition, etc.) of the sampling area, the interaction between lunar surface materials and solar wind, and the pedogenic mechanism of lunar soil.
In addition, according to the actual composition characteristics, if the collected samples are or produced from ancient plagioclase materials, it is also of great scientific value for the study of the early history of the moon; if the collected samples have or come from the basalt of the moon sea, it is of great value to the study of the lunar volcanism and even the thermal history; if the collected samples have the composition of impact breccia, they are of great scientific value to the study of the early history of the moon It is of great value to study the impact effect of the ball.

Good news in the morning! At 1:59, the lunar exploration project chang'e-5, carrying lunar samples, landed at Siziwang Banner landing site in central Inner Mongolia, marking the successful completion of China's first mission of sampling and returning extraterrestrial objects.

At about 1:00 a.m., Beijing aerospace flight control center injected high-precision navigation parameters into the chang'e-5 orbiter and reentry vehicle combination through the ground TT & C station. After that, the orbiter and the reentrant are usually unlocked and separated from the South Atlantic sea level at an altitude of about 5000 km, and then the orbiter completes the evasion as planned.

At 1:33 a.m., chang'e-5 entered the earth's atmosphere at a speed close to the second universe speed (about 11.2 kilometers per second), about 120 kilometers above the ground, and performed the first aerodynamic deceleration. After falling to a predetermined height, the retractor jumps out of the atmosphere and begins to slide downward after reaching the highest point. After that, the reentrant enters the atmosphere again and performs a second aerodynamic deceleration. When it descends to a height of about 10 km above the ground, the retractor opens the parachute to complete the final deceleration and maintain a stable attitude, and then lands smoothly in the predetermined area. The technicians who are responsible for the measurement, control and recovery of the search and recovery tasks will find the targets in time and carry out the recovery work in an orderly manner.

On December 3, the lifter ignited and took off and entered the orbit precisely. The rendezvous, docking and sample transfer with the orbiter and the reentrant assembly were completed on December 6. After that, separation and controlled lunar landing were carried out as planned. From December 12 to 16, the combination of the orbiter and the reentry vehicle separated from the orbiter and returned to earth on December 17 after completing two monthly earth transfer incident and two orbit corrections.

According to the plan, the recovered chang'e-5 reentrant will be airlifted to Beijing to open the cabin after completing the necessary ground treatment work, and take out the sample container and cargo. The National Space Administration will hold a handover ceremony at the right time and formally hand over the lunar samples to the ground application system. The first work related to the storage, analysis and research of extraterrestrial objects in China will also be started.

According to CCTV news and the latest news from NASA, chang'e-5 has successfully entered the lunar earth transfer orbit. In the future, the chang'e-5 orbiter and the reentrant combination carrying lunar samples will carry out intermediate orbit correction during the lunar earth transfer process, and select an opportunity to separate the orbiter and the reentrant, and return to earth according to the plan.

The second lunar earth transfer incident was carried out for the combination of chang'e-5 orbiter and reentrant. Four 150 n engines were successfully ignited at about 230 km from the lunar surface. The engines were shut down normally after about 22 minutes. According to the real-time telemetry data monitoring, the combination of the orbiter and the reentrant has successfully entered the lunar earth transfer orbit.

At 9:54 on December 12, the combination of chang'e-5 orbiter and reentry vehicle experienced a six-day waiting around the moon. The first lunar earth transfer incident was implemented, and the orbit was changed from a nearly circular orbit to an elliptical orbit with a height of about 200 km.

For the first time in history, a quantum computer built with photons has surpassed even the fastest classical supercomputer, according to US media.

A team of physicists led by Pan Jianwei and Lu Chaoyang from the University of science and technology of China (USTC), led by Pan Jianwei and Lu Chaoyang, realized the fast solution of the "Gaussian Bose sampling" task using the "nine chapters" prototype of quantum computing. According to a paper published online in the international academic journal Science, the result was 76 detected photons, far exceeding the previous record of five measured photons and the computing power of classic supercomputers.

The optical quantum interference physical figure. (website of University of science and technology of China)

Unlike traditional computers built with silicon processors, the "nine chapters" quantum computer is a sophisticated desktop device composed of lasers, mirrors, prisms and photon detectors, the report said. It's not a general-purpose computer that one day can send e-mail or store documents, but it can show the potential of quantum computing technology.

Computing power is far beyond the classical computer

Last year, Google made headlines, and its "sikomo" quantum processor took about three minutes to complete a task that took 10000 years for a supercomputer to complete. In its paper, the team of CUHK estimated that it would take an astonishing 2.5 billion years to perform the computing task of "nine chapters" by using the world's top supercomputer "Shenwei Taihu light".

The report pointed out that this is only the second time that scientists have demonstrated "quantum hegemony". The term describes a time when a quantum computer is exponentially faster than any classical computer to actually perform computing tasks that other devices cannot.

This time not only proves the principle, but there are some signs that "Gaussian boson sampling" may have practical uses, such as solving special problems in quantum chemistry and mathematics. More broadly, the ability to control photons as qubits is a prerequisite for building any large-scale quantum Internet. Quantum bits are similar to the bits used to represent information in the field of classical computing.

Scott Aronson is a theoretical computer scientist at the University of Texas at Austin. In 2011, he and his then student Alex alshibov pioneered the basic principles of Bose sampling. For many years, arenson said, boson sampling experiments have been limited to detecting only about three to five photons, which is "far from quantum hegemony". "It's hard to scale up, pay tribute to them," he said

In the past few years, quantum computing technology has leapt from obscurity to a multi billion dollar undertaking, and its potential impact on national security, the global economy and the foundations of physics and computer science has also been recognized, the report said. In 2019, the national quantum plan act of the United States was signed into law, and the United States intends to invest more than 1.2 billion US dollars (about 6.6 yuan per US dollar) in the field of quantum technology in the next 10 years. This field has also attracted a lot of hype, with some publishing unrealistic timetables and others boasting that quantum computers will completely obsolete classical computers.

According to the report, the latest action of CUHK team to demonstrate the potential of quantum computing is crucial, because the method it adopts is quite different from that of Google. "Xikemo" uses metal superconducting rings to form qubits, and in chapter nine, photons themselves are quantum bits. Lu Chaoyang said that this further independently confirmed that the principle of quantum computing can even realize "quantum hegemony" on completely different hardware. "Therefore, we are convinced that in the long run, it will be feasible to build useful quantum simulators and fault-tolerant quantum computers.".

Last year, the CUHK team demonstrated 14 photon Bose sampling, which is difficult for laptop computers, but easy for supercomputers. In order to expand the scale and ultimately achieve quantum hegemony, they adopted a slightly different protocol, namely "Gaussian boson sampling".

Christina Silberhorn, a quantum optics expert at the University of Paderborn in Germany and one of the developers of Gaussian boson sampling, said the technology was designed to avoid the unreliable single photon used by arenson and alcibov's vanilla boson sampling.

The report points out that Silberhorn admits that even so, the complexity of the CUHK installation is still daunting. The operation of "nine chapters" starts with a laser beam, which is divided into several beams to strike 25 crystals made of potassium Titanophosphate. When each crystal is hit, it reliably emits photons in two opposite directions. The photons are then fed into 100 inputs, where they quickly pass through a path of 300 prisms and 75 mirrors. Finally, these photons fall into 100 slits and are detected there. The average running time of the experiment was more than 200 seconds. The team of CUHK detected about 43 photons in each operation. But in one run, they observed 76 photons - enough to justify their claim to quantum hegemony.