Lifeboat Foundation: Safeguarding Humanity
Toggle light / dark theme

Blog

Category: computing

Quantum dot emitter delivers near-identical telecom photons at 40 million per second

Quantum technologies, devices that perform specific functions leveraging quantum mechanical effects, could soon outperform their classical counterparts on some tasks. Quantum emitters, devices that release individual particles of light (i.e., photons), are central components of many of these technologies, including quantum communication systems and quantum computers.

To enable the reliable operation of quantum technologies, emitters should emit photons with high consistency and coherence. In other words, they should ensure that the quantum properties of emitted photons remain stable and predictable.

Researchers at University of Copenhagen’s Niels Bohr Institute, Ruhr-University Bochum, University of Basel and Sparrow Quantum ApS recently developed a new photon emitter based on quantum dots, tiny structures that can trap electrons in confined regions and enable the controlled emission of individual photons.

How a single star can reshape an entire galaxy

Astronomers who simulate galaxies do not always get the same result, even when they start from identical conditions. New research from Leiden University shows that this is not a flaw, but a consequence of how galaxies behave—and how they are modeled.

The findings offer, for the first time, a way to address a long-standing question: how chaotic is a galaxy like the Milky Way really? The computer simulations by Tetsuro Asano and Simon Portegies Zwart (Leiden Observatory) will soon be published in Astronomy & Astrophysics and are available now on the arXiv preprint server.

The researchers created hundreds of models of Milky Way-like galaxies: flat disks of stars, embedded in a large, invisible cloud of dark matter that holds the system together. In each experiment, they ran two almost identical simulations, differing by just one tiny detail—for instance, a small shift in the position of a single star. Over time, that slight difference grows into visible structural changes: the spiral arms develop differently and the central bar rotates in another way.

Chip-scale photonic approach achieves ultralow-noise microwave and millimeter-wave signal generation

Researchers led by Dr. Changmin Ahn and Prof. Jungwon Kim at KAIST, in collaboration with Prof. Hansuek Lee, have demonstrated a chip-scale photonic approach for generating ultralow-noise and highly stable microwave and millimeter-wave signals based on optical frequency combs (microcombs), offering a potential pathway toward compact, high-performance frequency sources for next-generation technologies.

High-frequency signals in the tens to hundreds of gigahertz range are essential for emerging applications such as 6G communications, radar, and precision sensing. However, achieving both low noise and high stability at these frequencies remains a fundamental challenge for conventional electronic signal sources.

In the first study, published in Laser & Photonics Reviews, the researchers addressed the long-standing challenge of transferring the stability of an optical reference to a microcomb. Direct stabilization is difficult due to the lack of carrier-envelope offset detection in high-repetition-rate microcombs. To overcome this, they used a mode-locked laser as a transfer oscillator and synchronized it to the microcomb using electro-optic sampling.

Stanford’s new chip boosts light 100x with surprisingly low energy

Researchers at Stanford have developed a compact optical amplifier that dramatically boosts light signals using very little power. By recycling energy inside a looping resonator, the device achieves strong amplification with minimal noise and wide bandwidth. Its efficiency and small size mean it could run on batteries and be integrated into consumer electronics. This breakthrough could enable faster communications and more powerful optical technologies.

New ‘trick’ fixes major flaw in neutral-atom quantum computers — inching us closer to a superpowerful system

A new “geometry‑based” quantum swap gate makes neutral‑atom computers far less sensitive to laser noise — bringing large‑scale, stable quantum processors a step closer to reality.

A bizarre new state of matter may be hiding inside Uranus and Neptune

Deep inside planets like Uranus and Neptune, scientists may have uncovered a bizarre new state of matter where atoms behave in unexpected ways. Advanced simulations suggest that carbon and hydrogen, under crushing pressures and scorching temperatures, can form a strange hybrid phase—part solid, part fluid—where hydrogen atoms spiral through a rigid carbon framework. This unusual “superionic” structure could reshape how heat and electricity flow inside these distant worlds, potentially helping explain their mysterious magnetic fields.

The deep interiors of ice giant planets such as Uranus and Neptune may contain a previously unknown form of matter. This possibility comes from new computer simulations conducted by Carnegie scientists Cong Liu and Ronald Cohen.

Their study, published in Nature Communications, suggests that carbon hydride could take on an unusual quasi-one-dimensional superionic state under the intense pressures and temperatures found far beneath the surfaces of these distant planets.

Tumor-Infiltrating Clonal Hematopoiesis and Pan-Cancer Prognosis in Patients With Solid Tumors

Tumor-infiltrating clonal hematopoiesis was detected in 18% of patients with solid tumors and associated with older age, prior cytotoxic chemotherapy, and reduced overall survival, especially in breast cancer.

This retrospective cohort study investigated the association of TI-CH with clinical factors and its impact on OS in patients with solid tumors. The prevalence of TI-CH in this patient cohort was higher than in treatment-naive cohorts but lower than that in cohorts with higher rates of cytotoxic chemotherapy and radiotherapy. In addition, the prevalence of TI-CH was higher in patients with MSI-high colorectal tumors than in those with MSS colorectal tumors. Analysis of clinical factors revealed that each decade of increasing age and a history of cytotoxic chemotherapy were significantly associated with higher odds of TI-CH. Although TI-CH was associated with worse OS in the whole cohort (pan-cancer analysis), this outcome was most pronounced in patients with breast tumors. Furthermore, TI-CH of GATA2 in the whole cohort and TI-CH of TET2 in patients with breast tumors had the most prominent associations with worse OS.

The accumulation of somatic variants in hematopoietic stem cells with age provides a competitive advantage, leading to CHIP.2 Additionally, cytotoxic chemotherapy induces gene-specific clonal expansion by allowing clones with variants in DNA damage response genes (eg, TP53, PPM1D) to outcompete other clones because such variants are associated with chemoresistance.25 The TI-CH prevalence in our study was intermediate between treatment-naive and treatment-experienced cohorts. It was higher than in the former due to prior therapy and lower than in the latter owing to reduced exposure to cytotoxic chemotherapy and radiotherapy. This finding is notable given this study cohort’s older age, a known factor for increasing CHIP prevalence.6, 7 Furthermore, we found that TI-CH prevalence was higher in patients with MSI-high colorectal tumors than in those with MSS colorectal tumors. To our knowledge, this finding has not been previously reported.

The first direct observation of laser-created isolated hopfions

Over the past few decades, some physicists worldwide have been investigating unusual particle-like magnetic structures known as topological solitons. These structures could potentially be leveraged to develop new cutting-edge technologies, such as new magnetic memory devices and computing systems.

A type of topological solitons that has proven to be difficult to realize experimentally is the hopfion. This is a three-dimensional (3D) structure comprised of closed loops of continuously swirling spin textures, which can resemble linked or knotted vortex strings.

Researchers at South China University of Technology, Nankai University, Forschungszentrum Jülich, South China Normal University, University of Luxembourg, and Uppsala University recently reported the first direct observation of isolated hopfions in a magnetic material, which were created using laser pulses.

/* */