Quantum Computing News and Discussions

User avatar
Yuli Ban
Posts: 1536
Joined: Sun May 16, 2021 4:44 pm

Re: Quantum Computing News and Discussions

Post by Yuli Ban »

wjfox wrote: Tue Jun 15, 2021 8:14 pm
weatheriscool wrote: Tue Jun 15, 2021 6:59 pm I think this thread needs to be moved to the computer subforum.
There's some overlap, but I think quantum computing has slightly more relevance to physics.
It can be moved to the Computer & Internet subforum when quantum computers become more widespread and applied in the mainstream. Right now, even the most operational QCs are essentially physics experiments.
And remember my friend, future events such as these will affect you in the future
caltrek
Posts: 614
Joined: Mon May 17, 2021 1:17 pm

Re: Quantum Computing News and Discussions

Post by caltrek »

^^^Probably should have a thread in both forums. In the physics forum for articles that are more theoretical, and in the computers and internet forum for more commercial applications. Just my two cents cuz you guys are much better at those sorts of decisions than yours truly.
User avatar
wjfox
Site Admin
Posts: 1358
Joined: Sat May 15, 2021 6:09 pm
Location: Plague Island
Contact:

Re: Quantum Computing News and Discussions

Post by wjfox »

World's first scalable multi-chip quantum processor

3rd July 2021

Rigetti Computing, a California-based developer of quantum integrated circuits, has announced it is launching the world's first multi-chip quantum processor.

The processor incorporates a proprietary modular architecture that accelerates the path to commercialization and solves key scaling challenges toward fault-tolerant quantum computers.

"We've developed a fundamentally new approach to scaling quantum computers," says Chad Rigetti, founder and CEO of Rigetti Computing. "Our proprietary innovations in chip design and manufacturing have unlocked what we believe is the fastest path to building the systems needed to run practical applications and error correction."

[...]

"There is a race to get from the tens of qubits that devices have today, to the thousands of qubits that future systems will require to solve real-world problems," said Amir Safavi-Naeini, Assistant Professor of Applied Physics at Stanford University. "Rigetti's modular approach demonstrates a very promising way of approaching these scales."

Rigetti expects to make an 80-qubit system – the world's highest qubit count – available on its Quantum Cloud Services platform later this year, using the new breakthrough multi-chip technology.

Read more: https://www.futuretimeline.net/blog/202 ... qubits.htm


Image
"Take it easy, nothing matters in the end."
– William Shatner
weatheriscool
Posts: 1357
Joined: Sun May 16, 2021 6:16 pm

Re: Quantum Computing News and Discussions

Post by weatheriscool »

Team develops quantum simulator with 256 qubits, largest of its kind ever created
https://phys.org/news/2021-07-team-quan ... rgest.html
by Juan Siliezar, Harvard University
A team of physicists from the Harvard-MIT Center for Ultracold Atoms and other universities has developed a special type of quantum computer known as a programmable quantum simulator capable of operating with 256 quantum bits, or "qubits."

The system marks a major step toward building large-scale quantum machines that could be used to shed light on a host of complex quantum processes and eventually help bring about real-world breakthroughs in material science, communication technologies, finance, and many other fields, overcoming research hurdles that are beyond the capabilities of even the fastest supercomputers today. Qubits are the fundamental building blocks on which quantum computers run and the source of their massive processing power.
weatheriscool
Posts: 1357
Joined: Sun May 16, 2021 6:16 pm

Re: Quantum Computing News and Discussions

Post by weatheriscool »

Chinese achieve new milestone with 56 qubit computer
https://phys.org/news/2021-07-chinese-m ... qubit.html
by Bob Yirka , Phys.org

A team of researchers affiliated with multiple institutions in China, working at the University of Science and Technology of China, has achieved another milestone in the development of a usable quantum computer. The group has written a paper describing its latest efforts and have uploaded it to the arXiv preprint server.

Back in 2019, a team at Google announced that they had achieved "quantum supremacy" with their Sycamore machine—a 54 qubit processor that carried out a calculation that would have taken a traditional computer approximately 10,000 years to complete. But that achievement was soon surpassed by other teams from Honeywell and a team in China. The team in China used a different technique, one that involved the use of photonic qubits—but it was also a one-trick pony. In this new effort, the new team in China, which has been led by Jian-Wei Pan, who also led the prior team at the University of Science and Technology has achieved another milestone.
weatheriscool
Posts: 1357
Joined: Sun May 16, 2021 6:16 pm

Re: Quantum Computing News and Discussions

Post by weatheriscool »

Adding logical qubits to Sycamore quantum computer reduces error rate
https://phys.org/news/2021-07-adding-lo ... antum.html
by Bob Yirka , Phys.org
The Google Quantum AI team has found that adding logical qubits to the company's quantum computer reduced the logical qubit error rate exponentially. In their paper published in the journal Nature, the group describes their work with logical qubits as an error correction technique and outline what they have learned so far.

One of the hurdles standing in the way of the creation of usable quantum computers is figuring out how to either prevent errors from occurring or fixing them before they are used as part of a computation. On traditional computers, the problem is mostly solved by adding a parity bit—but that approach will not work with quantum computers because of the different nature of qubits—attempts to measure them destroy the data. Prior research has suggested that one possible solution to the problem is to group qubits into clusters called logical qubits. In this new effort, the team at AI Quantum has tested this idea on Google's Sycamore quantum computer.

Sycamore works with 54 physical qubits, in their work, the researchers created logical qubits of different sizes ranging from five to 21 qubits to see how each would work. In so doing, they found that adding qubits reduced error rates exponentially. They were able to measure the extra qubits in a way that did not involve collapsing their state, but that still provided enough information for them to be used for computations.
User avatar
Yuli Ban
Posts: 1536
Joined: Sun May 16, 2021 4:44 pm

Re: Quantum Computing News and Discussions

Post by Yuli Ban »

China Is Pulling Ahead in Global Quantum Race, New Studies Suggest
When a team of Chinese scientists beamed entangled photons from the nation’s Micius satellite to conduct the world’s first quantum-secured video call in 2017, experts declared that China had taken the lead in quantum communications. New research suggests that lead has extended to quantum computing as well.
In three preprint papers posted on arXiv.org last month, physicists at the University of Science and Technology of China (USTC) reported critical advances in both quantum communication and quantum computing. In one of the studies, researchers used nanometer-scale semiconductors called quantum dots to reliably transmit single photons—an essential resource for any quantum network—over 300 kilometers of fiber, well over 100 times farther than previous attempts. In another, scientists improved their photonic quantum computer from 76 detected photons to 113, a dramatic upgrade to its “quantum advantage,” or how much faster it is than classical computers at one specific task. The third paper introduced Zuchongzhi, made of 66 superconducting qubits, and performed a problem with 56 of them—a figure similar to the 53 qubits used in Google’s quantum computer Sycamore, which set a performance record in 2019.
Image
Photograph taken on November 26, 2016, shows a link established between the quantum satellite Micius and a quantum communication ground station in the north of China’s Hebei Province. Credit: Jin Liwang Alamy
And remember my friend, future events such as these will affect you in the future
User avatar
Yuli Ban
Posts: 1536
Joined: Sun May 16, 2021 4:44 pm

Re: Quantum Computing News and Discussions

Post by Yuli Ban »

Google says it has created a time crystal in a quantum computer, and it's weirder than you can imagine
In a new research paper, Google scientists claim to have used a quantum processor for a useful scientific application: to observe a genuine time crystal.

If 'time crystal' sounds pretty sci-fi that's because they are. Time crystals are no less than a new "phase of matter", as researchers put it, which has been theorized for some years now as a new state that could potentially join the ranks of solids, liquids, gases, crystals and so on. The paper remains in pre-print and still requires peer review.
Time crystals are also hard to find. But Google's scientists now rather excitingly say that their results establish a "scalable approach" to study time crystals on current quantum processors.

....

Time crystals, on the other hand, fail to settle in thermal equilibrium. Instead of slowly degenerating towards randomness, they get stuck in two high-energy configurations that they switch between – and this back-and-forth process can go on forever.

To explain this better, Curt von Keyserlingk, lecturer at the school of physics and astronomy at the University of Birmingham, who did not participate in Google's latest experiment, pulls out some slides from an introductory talk to prospective undergraduate students. "They usually pretend to understand, so it might be useful," von Keyserlingk warns ZDNet.
And remember my friend, future events such as these will affect you in the future
weatheriscool
Posts: 1357
Joined: Sun May 16, 2021 6:16 pm

Re: Quantum Computing News and Discussions

Post by weatheriscool »

Engineers make critical advance in quantum computer design
https://phys.org/news/2021-08-critical- ... antum.html
by University of New South Wales
Quantum engineers from UNSW Sydney have removed a major obstacle that has stood in the way of quantum computers becoming a reality. They discovered a new technique they say will be capable of controlling millions of spin qubits—the basic units of information in a silicon quantum processor.

Until now, quantum computer engineers and scientists have worked with a proof-of-concept model of quantum processors by demonstrating the control of only a handful of qubits.

But with their latest research, published today in Science Advances, the team have found what they consider "the missing jigsaw piece" in the quantum computer architecture that should enable the control of the millions of qubits needed for extraordinarily complex calculations.
weatheriscool
Posts: 1357
Joined: Sun May 16, 2021 6:16 pm

Re: Quantum Computing News and Discussions

Post by weatheriscool »

Quantum Optical Computer
August 19, 2021 by Brian Wang
Xanadu Quantum Technologies is a Canadian quantum computing hardware and software with US$145 million of funding.

In May, 2021, they raised US$100M in Series B financing. Bessemer Venture Partners led the round with participation from Capricorn, Tiger Global, BDC Capital, In-Q-Tel, along with returning investors Georgian, OMERS, and Tim Draper. The round brings Xanadu’s total investment to date to US$145M.

Xanadu was founded in 2016 with the objective of developing photon-based quantum computing to perform rapid and previously impossible computations at room temperature. They use silicon nitride chips.
https://www.nextbigfuture.com/2021/08/q ... puter.html
Post Reply