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Category: computing – Page 23
Entanglement Goes Steady
Two independent groups have demonstrated ways to entangle quantum bits without the need for precisely timed control pulses.
Quantum entanglement describes a link, or correlation, between the states of two or more quantum particles. For example, given a pair of entangled qubits—particles that can be in either a ground state or an excited state—measuring the state of one qubit can inform us about the state of the other. Entanglement is puzzling because it has no analogue in the classical world, where our physical intuition can be relied upon. In particular, entanglement appears to violate the principle of locality: The qubits’ states remain correlated even if we move them far apart before measuring them. But entanglement is more than a curiosity: It is also critical to quantum computing, where it serves as a resource for performing quantum algorithms and remote operations between distant qubits.
Battery-like device pulls CO₂ from air using electricity and saltwater chemistry
Engineers have developed a new way to pull carbon dioxide directly from the atmosphere using a process similar to charging and discharging a battery—an advance that could help address the planet’s excess CO2 problem.
A new collaborative study between scientists at the University of Illinois Urbana-Champaign and Toyota focuses on direct air capture, a technology designed to reduce new emissions and remove CO2 that has already accumulated in the atmosphere. Instead of using heat to absorb and release CO2, as many carbon capture methods do, the new method uses electricity and water-based chemistry within an electrochemical device.
The results of the study by mechanical engineering and science professor Kyle Smith, Illinois graduate students Paul Rozzi and JeongA Lee, and Chip Roberts and Tim Arthur from the Toyota Research Institute of North America are published in the journal Environmental Science & Technology.
New method brings single-particle quality control to nanocrystal manufacturing
Nanocrystals are already used in millions of devices, including televisions, laptops and displays, and are considered key materials for the next generation of quantum, sensing and solar technologies. However, they have not yet fully realized their potential. One major reason is their inherent heterogeneity: A single solution contains billions of nanocrystals whose properties can differ substantially. Although these particles can be characterized, important quality parameters are typically accessible only as average values across the entire sample.
“For their function in devices, these average values are insufficient,” says Professor Emiliano Cortés, who conducts research at LMU’s Nano-Institute. “Each individual nanoparticle can behave differently—for example, in its size or in how efficiently it emits light, meaning how effectively it converts absorbed energy back into light.”
Inside NTT’s Photonics Breakthroughs: A Roadmap to Light-Based Computing
This week we’re talking about photonics. My guests are Tim McKenna and Ryo Yanagimoto from the Physics and Informatics Laboratories at NTT.
Tim and I chat about balancing theoretical physics with real-world applications at NTT, his most exciting photonics projects, and the primary obstacles to replacing traditional electronics with photonics technologies.
Ryo and I dig into the game-changing potential of NTT’s programmable photonics chips. We discuss how their unique reconfigurability is shaking up traditional hardware manufacturing, facilitating a move from power-hungry electrical processing toward light-driven computation, even allowing chips to self-correct for environmental shifts.
Researchers find simple solution for extending the lifespan of LEDs made from glowing quantum dots
A new study led by MIT researchers could drive the development of more energy-efficient digital displays—such as flat-screen TVs, augmented and virtual reality headsets, smartphone screens, medical imaging devices and even large-area ambient lighting surfaces—that also generate richer, brighter colors.
The MIT scientists, in collaboration with researchers at Samsung, studied the microscopic changes that occur inside LEDs that use electrically excited quantum dots, which are precisely shaped nanoscale semiconductor particles that emit extremely pure colored light. The research appears in Science Advances.
Quantum dots are currently used in some of the computer and television displays with the best picture quality available. The efficiency of these displays could be further improved, and their manufacturing process further simplified, if the quantum dots could be electrically excited, as was first demonstrated in the quantum dot LED (QD-LED) structures more than 20 years ago.
Harvard scientists turn a silicon chip into a DNA writing machine
Scientists have created a silicon chip that can write dozens of DNA sequences simultaneously using electricity and water-based enzymes, offering a cleaner alternative to conventional DNA manufacturing. The breakthrough could eventually support portable DNA-writing devices and even massive DNA data storage, although new chemistry will be needed to scale the technology further.
Oratomic raises $300M to build a viable quantum computer that needs only 20K qubits
A number of companies, betting on various architectural approaches, are trying to build the first commercially viable quantum computer capable of significantly outperforming current systems.
Oratomic, which entered the race earlier this year with the goal of developing the first utility-scale quantum computer by the end of the decade, said this week that it has raised $300 million. The massive Series A round was co-led by ARCH Venture Partners, Spark Capital, and Khosla Ventures, with participation from Bezos Expeditions, Index Ventures, General Catalyst, Lowercarbon Capital, Bain Capital, and others.
Founded by Caltech physicists, Oratomic uses lasers, which act as optical tweezers, to hold individual atoms in place as the basis for its quantum computer.
US invests $16M to revive radiation-hardened chip production
US invests $16M in BAE Systems to restore domestic production of radiation-hardened chips for defense programs.
Evidence reveals that the language of thought is not natural language
Some people find it useful to talk through their problems—but language isn’t necessary for logical reasoning, cognitive neuroscientists at MIT’s McGovern Institute for Brain Research say.
In research published in the journal PNAS, researchers led by MIT associate professor of brain and cognitive sciences Evelina Fedorenko have shown that people can perform well on tasks that require logical reasoning even if their language abilities are severely impaired. What’s more, brain imaging shows that language-processing parts of the brain are not called on for logical reasoning.
Philosophers, linguists and cognitive scientists have debated the relationship between language and thought for thousands of years, with many arguing that we use language to think. There are good reasons to suspect a close relationship between logic and language, acknowledges Hope Kean, a postdoctoral researcher and former K. Lisa Yang, Integrative Computational Neuroscience (ICoN) Center graduate fellow in Fedorenko’s lab.