Xanadu, the quantum computing startup known for PennyLane and Strawberry Fields, has launched its photonics quantum computing platform.
Category: computing – Page 592
The technology behind the quantum computers of the future is fast developing, with several different approaches in progress. Many of the strategies, or “blueprints,” for quantum computers rely on atoms or artificial atom-like electrical circuits. In a new theoretical study in the journal Physical Review X, a group of physicists at Caltech demonstrates the benefits of a lesser-studied approach that relies not on atoms but molecules.
“In the quantum world, we have several blueprints on the table and we are simultaneously improving all of them,” says lead author Victor Albert, the Lee A. DuBridge Postdoctoral Scholar in Theoretical Physics. “People have been thinking about using molecules to encode information since 2001, but now we are showing how molecules, which are more complex than atoms, could lead to fewer errors in quantum computing.”
At the heart of quantum computers are what are known as qubits. These are similar to the bits in classical computers, but unlike classical bits they can experience a bizarre phenomenon known as superposition in which they exist in two states or more at once. Like the famous Schrödinger’s cat thought experiment, which describes a cat that is both dead and alive at the same time, particles can exist in multiple states at once. The phenomenon of superposition is at the heart of quantum computing: the fact that qubits can take on many forms simultaneously means that they have exponentially more computing power than classical bits.
Technologies that rely on quantum bits (qubits) require long coherence times and high-fidelity operations1. Superconducting qubits are one of the leading platforms for achieving these objectives2,3. However, the coherence of superconducting qubits is affected by the breaking of Cooper pairs of electrons4,5,6. The experimentally observed density of the broken Cooper pairs, referred to as quasiparticles, is orders of magnitude higher than the value predicted at equilibrium by the Bardeen–Cooper–Schrieffer theory of superconductivity7,8,9. Previous work10,11,12 has shown that infrared photons considerably increase the quasiparticle density, yet even in the best-isolated systems, it remains much higher10 than expected, suggesting that another generation mechanism exists13. Here we provide evidence that ionizing radiation from environmental radioactive materials and cosmic rays contributes to this observed difference. The effect of ionizing radiation leads to an elevated quasiparticle density, which we predict would ultimately limit the coherence times of superconducting qubits of the type measured here to milliseconds. We further demonstrate that radiation shielding reduces the flux of ionizing radiation and thereby increases the energy-relaxation time. Albeit a small effect for today’s qubits, reducing or mitigating the impact of ionizing radiation will be critical for realizing fault-tolerant superconducting quantum computers.
Intel’s Chief Architect, Raja Koduri, has presented a roadmap for increasing the number of transistors able to fit on a chip by a factor of 50.
During a keynote presentation at this year’s Hot Chips conference (held virtually), he described the ways in which computer technology can continue to shrink over the next 10 years – helping to sustain the famous trend known as Moore’s Law.
For many years, analysts have been predicting the end of Moore’s Law, with concerns that the exponential growth in computer processing power may be slowing or about to reach a fundamental limit. However, thanks to new innovations in processor architecture and power consumption, Mr. Koduri is adamant that plenty of life remains in this trend.
It was at this webcast that Musk unveiled the latest version of his company NeuraLink’s latest prototype, the Link VO.9 — a chip that would allow humans to control devices with their brains.
Musk said this could eventually help cure people with conditions like memory loss, hearing loss, paralysis, blindness, brain damage, depression and anxiety.
Viewers of the webcast met Gertrude, a pig that had the chip implanted in her brain two months ago. A graph shown onscreen showed the waves inside Gertrude’s brain, which fired when her brain communicated with her snout while she was eating.
45 seconds with Elon Musk during his BCI demonstration. The excerpt counts with subtitles in Spanish.
Excerpt from the demonstration by Elon Musk of the Brain Computer Interface (BCI) in development progress by Neuralink. The event took place on August 28, 2020.
Cuenta con subtítulos en Español.
To watch the entire demonstration click here: https://youtu.be/iOWFXqT5MZ4
In this video, Elon Musk demonstrates a prototype brain–computer interface chip – implanted in a pig – that his company, Neuralink, has been working on. The device could one day be used by humans to augment their abilities.
Founded in 2016, the Neuralink Corporation remained highly secretive about its work until July 2019, when Musk presented his concept at the California Academy of Sciences. It emerged that he planned to create brain–machine interfaces (BMIs) not only for diseased or injured patients, but also healthy individuals who might wish to enhance themselves.
Yesterday, in a livestream event on YouTube, Musk unveiled a pig called Gertrude with a coin-sized chip in her brain. Simpler and smaller than the original revealed last year, the read/write link device can nevertheless pack 1,024 channels with megabit wireless data rate and all-day battery life. This latest prototype – version 0.9 – has now been approved as an FDA breakthrough device, allowing it to be used in limited human trials under the US federal guidelines for testing medical devices. The chip is removable, Musk explained, as he showed another pig called Dorothy, who no longer had the implant and was healthy, happy and indistinguishable from a normal pig.
The tech entrepreneur Elon Musk on Friday showed off a pig whose brain he says has been implanted with a small computer.
“We have a healthy and happy pig, initially shy but obviously high energy and, you know, kind of loving life, and she’s had the implant for two months,” Musk said of Gertrude, the pig.
The billionaire entrepreneur, whose other companies include Tesla and SpaceX, presented during a live-stream event to recruit employees for his neuroscience startup Neuralink. He described Gertrude’s coin-sized implant as “a Fitbit in your skull with tiny wires”.
Physicists’ latest achievement with neutral atoms paves the way for new quantum computer designs.
In the quest to develop quantum computers, physicists have taken several different paths. For instance, Google recently reported that their prototype quantum computer might have made a specific calculation faster than a classical computer. Those efforts relied on a strategy that involves superconducting materials, which are materials that, when chilled to ultracold temperatures, conduct electricity with zero resistance. Other quantum computing strategies involve arrays of charged or neutral atoms.
Now, a team of quantum physicists at Caltech has made strides in work that uses a more complex class of neutral atoms called the alkaline-earth atoms, which reside in the second column of the periodic table. These atoms, which include magnesium, calcium, and strontium, have two electrons in their outer regions, or shells. Previously, researchers who experimented with neutral atoms had focused on elements located in the first column of the periodic table, which have just one electron in their outer shells.