Pan Jianwei and Lu Chaoyang team of China University of Science and Technology set four world records in experiments

Recently, Chinese Academy of Sciences academician, Professor Pan Jianwei of China University of Science and Technology and others, in cooperation with scientists in Germany and the Netherlands, for the first time in the international community to achieve 20 photon input 60 x 60 mode interference line of the bose sampling quantum computing, in the four key indicators have greatly refreshed the international record, close to the realization of the important goal of quantum computing research.” Quantum hegemony”.

Chinese scientists have made a breakthrough in the field of light quantum!

Pan Jianwei and Lu Chaoyang team of China University of Science and Technology set four world records in experiments

The results were published in the form of “editor recommendations” in the journal Physical Review Express, an international authoritative academic journal, which concluded that the breakthrough was “a huge leap forward” and “a spring springboard” to achieve ‘quantum supremacy’.”

Pan Jianwei and Lu Chaoyang team of China University of Science and Technology set four world records in experiments

The Physics Website of the American Physical Society, which features a “Bosin sampling quantum computing approaching milestone”, said the experiment was close to surpassing traditional computers, representing a milestone in the field of quantum computing.

China’s quantum computing research has made important progress: boson sampling experiment approaches “quantum supremacy”

According to Xinhua, Science Network and other media reports, China University of Science and Technology Pan Jianwei, Lu Chaoyang and other chinese Academy of Sciences Shanghai Institute of Microsystems and Information Technology Yu Lixing and scientists from Germany and the Netherlands, the first time in the international community to achieve 20 photon input 60 x 60 mode interference line of the bolsion sampling quantum calculation, The Hilbert state space, which outputs 48 qubits of complexity, has a dimension of 370 trillion.

Pan Jianwei and Lu Chaoyang team of China University of Science and Technology set four world records in experiments

This work greatly exceeds the previous international record in the four key indicators of photon number, pattern number, computational complexity, and state space, in which the state space dimension is ten billion times higher than that of previous optical quantum computing experiments with international peers. The paper was recently published in the form of “Editor’s Recommendation” in the Journal of Physical Review Letters (PRL). The Physics website of the American Physical Society features a feature on this work under the title “The Near milestone of boson sampling quantum computing”.

Quantum computers have ultra-fast parallel computing power in principle, and they achieve exponential acceleration compared to classical computers in some problems of great social and economic value. At present, the development of quantum computer has become one of the biggest challenges of cutting-edge science, and has become the focus of competition in all countries in the world.

Among them, the first stage goal of quantum computing research is to realize the “superiority of quantum computing” (also known as “quantum supremacy”), that is, to develop quantum computers that can surpass classical supercomputing in solving specific tasks. In this strategic goal, Pan Jianwei and Lu Chaoyang research team have long been committed to the research of scalable single photon sources and boson sampling quantum computing.

Pan Jianwei and Lu Chaoyang team of China University of Science and Technology set four world records in experiments

A comprehensive summary of optical quitts.Source:Sina Science and Technology

Earlier this year, the team proposed the theory of coherent two-color excitation and elliptical microcavity coupling, which solved both the final problems of mixed polarization and laser background scattering in single photon sources, and successfully developed deterministic polarizing, high purity, high-all-homogenous, and high-efficiency monophotoone sources in narrow band and broadband microcavities. The results were selected as the cover article of Nature Photonics.

The research team used the self-developed international highest efficiency and highest quality single photon source, the largest scale and highest transmission rate of multi-channel optical interferometer, and through cooperation with the Shanghai Institute of Microsystems and Information Technology of the Chinese Academy of Sciences Yu Lixing in the superconducting nanowire high-efficiency single photon detector, the successful realization of 20 photon input 60 x The 60-mode (60 inputs, 60-layer line depth, including 396 beam dividers and 108 mirrors) interfered with the bose sampling experiment of the line.

Compared with similar work by international counterparts, the number of single photons successfully manipulated by the HKUST experiment increased fivefold, the number of modes increased five folds, the sampling rate increased by 60,000 times, and the output space dimension increased by ten billion times. Among them, due to the high-mode characteristics of multi-photons, the output state space reached 370 trillion dimensions, which is equivalent to the 48 quantum bits of the expanded Hilbert space.

For the first time, the experiment pushed boson sampling into a whole new area: the inability to directly and fully validate the wave-color sampling quantum computing prototype through a classic computer was a crucial step toward demonstrating the scientific goal of demonstrating the superiority of quantum computing.

The PRL reviewer noted that the achievement “takes important steps in solving critical issues and is a huge leap forward, not only an influential test of the capabilities of optical quantum computing, but also a spring springboard to the superiority of quantum computing.”

“This represents a milestone in quantum computing: approaching the point where classical computers can’t simulate quantum systems,” says Physics, a website owned by the American Physical Society.

Pan Jianwei: The man who holds the quantum “secret key”

In China’s quantum field, there are individuals who can’t help but mention that he has been dubbed “the father of Chinese quantum” in some reports, and he is Pan Jianwei.

Pan Jianwei and Lu Chaoyang team of China University of Science and Technology set four world records in experiments

Pan Jianwei, Professor of The University of Science and Technology of China, Fellow of the Chinese Academy of Sciences, Fellow of the Academy of Sciences of Developing Countries, Foreign Fellow of the Austrian Academy of Sciences, Director of the Institute of Quantum Information and Quantum Science and Technology Innovation of the Chinese Academy of Sciences, and Chief Scientist of the Quantum Science Experimental Satellite Pilot of the Chinese Academy of Sciences.

World-class laboratories to further their studies and bring technology back to China

In 1996, Pan Jianwei, who completed his undergraduate and master’s degree studies in the Department of Modern Physics of the Chinese University of Science and Technology, entered in Innsbruck University, Austria, to pursue his Ph.D. from Anton Salinger. At the time, he didn’t know that Salinger was leading a large-scale quantum information research project in China, where a research project often cost only 50,000 yuan and 100,000 yuan, but it was more than a million euros.

In a world-class laboratory, Pan Jianwei is taking part in the experiment on the front line while also wondering where he should go in the future. By then, he had begun to pay attention to what he had learned and intended to bring the emerging technology back to China in the future.

In 1999, Pan Jianwei received his Ph.D. in Experimental Physics from the University of Vienna, Austria. In 2001, Pan Jianwei, who had returned from school, began to mull the construction of china’s quantum laboratory. With the increasing investment of scientific research in our country, quantum laboratory from scratch, from there to strong.

Pan Jianwei’s team has been experimenting with quantum satellites since 2003: a series of ground experiments have shown that quantum communication through satellites is feasible. Under Pan Jianwei’s leadership, in August 2016, the quantum science experimental satellite Moko was launched from the Jiuquan Satellite Launch Center, becoming the world’s first quantum satellite.

In September 2017, more than 2000 kilometers of quantum communication Beijing-Shanghai trunk line, the use of optical fiber transmission of quantum signals, to achieve quantum confidential communication between the two places, while its Beijing access point and the Moiko satellite connection, breaking through the ground fiber transmission distance short board, there is a view that this makes it possible to achieve the global coverage of quantum communication.

Pan Jianwei’s team’s series of scientific research achievements make China’s quantum confidential communication experimental research and applied research in the international leading level.

Pan Jianwei and Lu Chaoyang team of China University of Science and Technology set four world records in experiments

Appearinthes in “Nature’s Top 10 People of the Year”

In 2017, Professor Pan Jianwei appeared on Nature’s Top 10 People of the Year, accompanied by a news feature that begins with:

In China, some people call him the “Father of Quantum”. Pan Jianwei deserves this name. Under his leadership, China became a leader in long-distance quantum communication technology, which uses quantum laws to securely transmit information. After finishing his studies in Europe, Pan returned to China in 2008 to devote himself to scientific research, which has since ignited the fire of China’s development of quantum technology. “Every time I see their research progress, I’m shocked,” said Christopher Monroe, a quantum physicist at the University of Maryland. “

Today, Pan Jianwei has become one of China’s leading scientists in quantum communications, leading China’s quantum research steadily forward.

Google’s quantum breakthrough doesn’t mean China lost the quantum computer race

One of the key words for 2019 is “quantum supremacy”, after Google’s “quantum superiority” in Nature’ text, in which Professor Pan Jianwei, head of China’s quantum computing team, said the US had now overtaken China, but that was “definitely not the end”, and Professor Pan’s team members said: The Chinese team still has hope for quantum supremacy, and the “Holy Grail” competition for science and technology is just beginning.

In this regard, there are also different views that China’s related research started slowly. According to quantum scientists, Google launched the quantum computer program 13 years ago, and other US companies, such as IBM, have invested heavily in and built prototypes, but China has only recently begun similar work.

The above views, there are also rebuttals. For now, there is still a long way to go before quantum computers are available, and no practical application is available in the advanced technologies of the United States and China.

“The gap between China and the U.S. in quantum computing technology is not that great. Wu Wei, a professor of quantum physics at Peking University, said, “We haven’t left the starting line yet.” If there’s any difference, it’s probably no big deal, because we’re far from any real application. “

It is unrealistic to expect a breakthrough in quantum research, which could force quantum research to wander between science fiction and reality

Today, the reliability of quantum computers remains in doubt. For example, Sycamore can only guarantee 0.2% accuracy after 20 rounds of simulation. Particles in quantum computers are also susceptible to the influence of their surroundings because of their fragile conditions.

Although the laptop’s central processor can run trouble-free for years, Google’s quantum chips must stop every few microseconds.

Google’s claims about its quantum chips have also been questioned by some in the US scientific community. For example, IBM has published a study claiming that Google’s quantum simulations are exaggerated because they can be done on classic computers in a matter of days, if not faster.

But quantum computers are the holy grail of human science and technology. It has attracted great interest from the government, private investors and the public. However, the immediate hopes of a breakthrough are unrealistic and could force quantum researchers to “walk the narrow path between reality and science fiction” in search of more funding and support.

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