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Category: quantum physics – Page 16

Laser qubits in the sky over Long Island — scientists test quantum communication in the air

American scientists plan to implement a project to test quantum communication in free space. Using lasers, they want to launch qubits over the Long Island Sound.

It is noted, that three laser beams from the telescope on top of the Kline Tower on the Yale University campus will be directed across the Long Island Sound at a distance of nearly 43.5 km and captured on the opposite side by a similar telescope on the roof of the University Hospital Stony Brook.

The goal of the Quantum Laser Across the Sound project is to expand the ability to send and receive quantum information and demonstrating the potential for possible future quantum computing infrastructures. The telescope on top of the Kline Tower will send entangled photons 43.4 km across the Long Island Sound.

Is Consciousness a Field? | Robert Lawrence Kuhn

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Why is there something rather than nothing? Robert Lawrence Kuhn, creator of Closer To Truth, joins John Michael Godier to explore one of the most profound questions in science and philosophy. The discussion moves through materialism, idealism, panpsychism, and quantum perspectives, asking whether consciousness is merely a byproduct of evolution or a fundamental aspect of reality, and what that could mean for the universe, artificial intelligence, and the nature of mind. Kuhn discusses his recent paper, A Landscape of Consciousness: Toward a Taxonomy of Explanations and Implications, which maps the full range of consciousness theories and explores their broader significance.

Links:
Closer to Truth.
https://www.youtube.com/c/CloserToTruthTV

Homepage

A landscape of consciousness: Toward a taxonomy of explanations and implications by Robert Lawrence Kuhn https://www.sciencedirect.com/science/article/pii/S0079610723001128?via%3Dihub.

Seeing the consciousness forest for the trees by Àlex Gómez-Marín.
https://iai.tv/articles/seeing-the-consciousness-forest-for-the-trees-auid-2901

00:00:00 Introduction to Robert Lawrence Kuhn and consciousness.

Continue reading “Is Consciousness a Field? | Robert Lawrence Kuhn” | >

Strained strontium titanate membrane crosses into ferroelectric—and quantum—territory

Strontium titanate was once used as a diamond substitute in jewelry before less fragile alternatives emerged in the 1970s. Now, researchers have explored some of its more unusual properties, which might someday be useful in quantum materials and microelectronics applications.

Writing in the journal Nature Communications, the team explains how they built an extremely thin, flexible strontium titanate membrane and stretched it, in the process turning on what’s known as a ferroelectric state. In that state, the material generates its own , somewhat similar to how a generates its own magnetic field.

“We applied strain to tune the membrane to a ferroelectric or non-ferroelectric state reversibly and repeatedly,” said Wei-Sheng Lee, a lead scientist at the Department of Energy’s SLAC National Accelerator Laboratory and a principal investigator at the Stanford Institute for Materials and Energy Sciences (SIMES), a joint SLAC-Stanford institute. “This allowed quantitative characterizations of this transition in strontium titanate with unprecedented details.”

Quantum computers may crack RSA encryption with fewer qubits than expected

A team of researchers at AI Google Quantum AI, led by Craig Gidney, has outlined advances in quantum computer algorithms and error correction methods that could allow such computers to crack Rivest–Shamir–Adleman (RSA) encryption keys with far fewer resources than previously thought. The development, the team notes, suggests encryption experts need to begin work toward developing next-generation encryption techniques. The paper is published on the arXiv preprint server.

RSA is an encryption technique developed in the late 1970s that involves generating public and private keys; the former is used for encryption and the latter decryption. Current standards call for using a 2,048-bit encryption key. Over the past several years, research has suggested that quantum computers would one day be able to crack RSA encryption, but because quantum development has been slow, researchers believed that it would be many years before it came to pass.

Some in the field have accepted a theory that a quantum computer capable of cracking such codes in a reasonable amount of time would have to have at least 20 million qubits. In this new work, the team at Google suggests it could theoretically be done with as few as a million qubits—and it could be done in a week.

Superconducting diode bridge efficiently converts AC to DC for quantum circuits

Superconductivity is an advantageous property observed in some materials, which entails an electrical resistance of zero at extremely low temperatures. Superconductors, materials that exhibit this property, have proved to be highly promising for the development of various electronic components for both classical and quantum technologies.

Researchers at Massachusetts Institute of Technology (MIT), University of California–Riverside and SEEQC Inc. recently introduced a new system comprised of four superconducting diodes (SDs), which are that allow electric current to flow in only one direction and are made of .

Their superconducting diode bridge, introduced in a paper published in Nature Electronics, was found to perform remarkably well at cryogenic temperatures, achieving rectification efficiencies as high as 42% ± 5%.

2D quantum sensor uses spin defects for precise magnetic field detection

A team of physicists at the University of Cambridge has unveiled a breakthrough in quantum sensing by demonstrating the use of spin defects in hexagonal boron nitride (hBN) as powerful, room-temperature sensors capable of detecting vectorial magnetic fields at the nanoscale. The findings, published in Nature Communications, mark a significant step toward more practical and versatile quantum technologies.

“Quantum sensors allow us to detect nanoscale variations of various quantities. In the case of magnetometry, quantum sensors enable nanoscale visualization of properties like current flow and magnetization in materials leading to the discovery of new physics and functionality,” said Dr. Carmem Gilardoni, co-first author of this study at Cambridge’s Cavendish Laboratory.

“This work takes that capability to the next level using hBN, a material that’s not only compatible with nanoscale applications but also offers new degrees of freedom compared to state-of-the-art nanoscale .”

Solitonic superfluorescence paves way for high-temperature quantum materials

A study in Nature describes both the mechanism and the material conditions necessary for superfluorescence at room temperature. The work could serve as a blueprint for designing materials that allow exotic quantum states—such as superconductivity, superfluidity or superfluorescence—at high temperatures, paving the way for applications such as quantum computers that don’t require extremely low temperatures to operate.

The international team that did the work was led by North Carolina State University and included researchers from Duke University, Boston University and the Institut Polytechnique de Paris.

“In this work, we show both experimental and theoretical reasons behind macroscopic quantum coherence at high temperature,” says Kenan Gundogdu, professor of physics at NC State and corresponding author of the study.

Erasure cooling, control, and hyperentanglement of motion in optical tweezers

Coherently controlling the motion of single atoms in optical tweezers would enable new applications in quantum information science. To demonstrate this, we first prepared atoms in their motional ground state using a species-agnostic cooling mechanism…