The first quantum computer to rely on light.(2021)

By News World 367



 Chinese scientists have demanded the creation of a light-dependent quantum computer for the first time. This particular quantum computer has been dubbed 'Jiujhang'. They claim that it can calculate 10 billion times faster than the world's most powerful supercomputer.

This relatively small quantum computer can solve many complex problems. No supercomputer is so powerful today. The world's most powerful supercomputer could take 2 billion years to calculate, it would end in 200 seconds.


This is the second time that humanity has reached this milestone after Google announced that its quantum computer of 53 kilobits had achieved such a breakthrough last year.


However, Jiuzhang used a new method of processing 76 photons to perform calculations instead of Google's method, which uses superconducting materials.


Experts hailed the Chinese machine as a "state-of-the-art experiment" and a "major achievement" in quantum computing, as it proves the feasibility of optical quantum computation and thus provides a fundamentally different approach to designing such powerful machines.


Quantum computers excel at running impossible simulations for traditional computers, leading to breakthroughs in materials science, artificial intelligence, and medicine.



Moreover, most components of a light-based quantum machine can operate at room temperature, regardless of the perceptual equipment, which should be kept at -269.1 ° C. It must be kept in very cold temperatures to ensure that the materials can conduct electricity without any resistance.


Jiuzhaigou takes its name from an ancient Chinese mathematical text. It can perform a class-specific calculation, called a Gaussian boson sampling, in 200 seconds. The task itself would take the world's fastest classic supercomputer, the Fugaku, about 600 million years.


Fabio Ciarino, a quantum physicist at Sapienza University in Rome, told Science News, an outlet in the United States, that his first impression of the Chinese quantum computer was simply "fantastic," according to interviews conducted by the Chinese University of Science and Technology in Hefei, Anhui Province, which Its Jiuzhang researchers, Barry Sanders, director of the Institute of Quantum Science and Technology at the University of Calgary, Canada, have called the achievement "one of the most significant results in computing" since Google's claim to quantitative advantage was challenged last year by IBM.


Anton Zillinger, a quantum physicist and president of the Austrian Academy of Sciences, said that after this experiment, he expects that there will be a very good chance that quantum computers will be used on a large scale someday, according to university interviews.


"I am very optimistic about this estimate, but we have a lot of smart people working on these things, including my colleagues in China. Therefore, I am sure we will see very rapid development."


Computing power

The astronomical computing power of quantum machines arises from their building blocks, called quantum bits, or qubits, according to the University of Science and Technology in China. Unlike parts of classic computers that present data in either a 0 or 1 form, similar to turning on and off a light switch, qubits can harness the peculiar property of quantum mechanics known as superposition and exist as 0 seconds, 1 second, or everything in between, like increments on Control knob.


Quantum machines can take mathematical shortcuts when simulating very complex scenarios, while traditional computers have to force their way into a solution, which takes much longer in the process. Moreover, the computing power of quantum machines can increase dramatically as more qubits are added.


Therefore, Jiuzhang, which uses 76 photons as a qubit, is about 10 billion times faster than the 53 qubit computer developed by Google, according to the university.


The university said in a press release: "This feat solidifies China's position as the first country in the field of quantum computing."


Known as the largest quantum scientist in China and one of the main researchers behind Jiuzhang, Pan Jianwei said that the calculations they made could not only demonstrate the computing prowess of a machine but also show potential practical applications in machine learning, quantum chemistry, and graph theory. “Quantum computing has already become an arena of fierce competition between the United States, Europe and other developed regions,” Pan said, adding that China's quantum computational advantage has taken about seven to ten years since the team first decided to tackle boson sampling. Trouble around 2013.


However, Ban stressed that the photonic quantum computer is a highly specialized and unconventional machine and that it is an elaborate, coherent table-top setup of lasers, mirrors, and detectors, and is currently only programmed to take boson samples. "It is not a general-purpose quantum computer."


Lu Chaoyang, another key researcher behind Jiuzhang, said that even if a machine is only good at one job, such as analyzing materials, it can still have great social and economic value if it can overcome a very difficult problem.


In the near future, Luo said, scientists may increase the potential production states of Jiushang - a key indicator of computing power - by 10 orders of magnitude, from 10 to the 30th power to 10 to the 40th.

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