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IBM once again overtook Google: Developed a 50-qubit computer prototype

via:博客园     time:2017/11/14 9:32:01     readed:1183

Surging news reporter Wang Xin Xin

In the field of quantum computer, Google has been regarded as "leader". Previously, Google has produced 9 qubits of the machine, and plans to increase this year to 49 qubits, to achieve "quantum supremacy" (quantum supremacy). But now, IBM is the first to accomplish that.


IBM developed a 50-qubit prototype

Local time On November 10, at the American Institute of Electrical and Electronics Engineers (IEEE) Industrial Summit, IBM announced that it has successfully developed a 20-qubit quantum computer that will be available to paying customers by the end of the year. More to note, IBM has also successfully developed a 50-bit quantum prototype that will provide the foundation for future IBM Q systems.

IBM wrote in an official blog that the Coherence time based on a 20-qubit quantum computer doubles the coherence time, which is the range of the maximum time difference over which the channel remains constant, from the previous 50 microseconds reaching an average coherence time of 90 microseconds . And the design of this quantum calculator is scalable: a quantum computer based on 50 qubits has a similar behavior.


IBM20 and 50 qubits

A computer with 50 qubits can definitely be an important milestone in the history of computer science. Researchers in the field refer to this milestone as "quantum hegemony", which can perform tasks that common supercomputers can not.

Dario Gil, vice president of research at IBM's Artificial Intelligence and IBM Q, said the increase in the number of qubits is just one aspect. The more qubits you deal with, the more complicated the interaction between the qubits will be, because the quantum has intertwined properties. If you have more qubits, but they have a high error rate when they are related to each other, then they are not necessarily more powerful than a 5-qubit machine with a lower error rate.

Another concern is that they tend to exist for a short period of time in a process called coherence when dealing with quantum states. This means that the researcher has only a short time window before the qubits return to the classic state of 0 and 1 computations. In the late 1990s, researchers focused on coherence in just a few nanoseconds. Even last year, IBM was only able to get 47 microseconds and 50 microseconds of coherence time for a 5-qubit machine. The relevant time announced by IBM in 90 microseconds or so, is a huge leap.

In addition to quantum computers, IBM has made its mark in software. QISKit, developed by QISKit, is a quantum information software processing toolkit that can be used to help research communities to maximize the use of quantum computing systems at their core. IBM said it is a tool that builds, manipulates, displays and studies quantum bits based on the Python language, characterizes quantum bits, batch task tools, and a compilation tool that compiles the required experiments to real hardware.

Since last year, IBM introduced 5 qubits of advanced computers, IBM has been triumphing in the field of quantum computers. In March of this year, IBM announced that it is planning to launch the world's first commercial quantum computing cloud service this year: IBM Q. This is also the world's first paid quantum computing cloud service system.


The difference between quantum computers and traditional computers

Compared with traditional computers, the biggest difference between quantum computers is that traditional computers can only solve the problems one by one in chronological order, while quantum computers can solve multiple problems simultaneously. Traditional computing algorithms used are binary, with 0 and 1 record information status. However, quantum computers describe information from the quantum state. According to the characteristics of the quantum, it can simultaneously represent multiple states and perform overlay operations at the same time, thereby having a faster calculation method.

Due to quantum computer processing power higher than the current traditional supercomputer several orders of magnitude. Therefore, many believe that quantum computers will accomplish tasks that were previously considered impossible to do, such as simulating chemical catalysts, modeling super-complex systems, cracking encrypted passwords, and more. But to date, these companies have developed quantum computer processing capabilities that are either not powerful enough or accurate enough to run most tasks far beyond traditional computers.

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