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Cornell Researchers Develop Faster Chip-Based Laser Cooling for Quantum Computers, Addressing Bottleneck

Cornell Researchers Develop Faster Chip-Based Laser Cooling for Quantum Computers, Addressing Bottleneck

Researchers at Cornell University have developed a new laser-cooling technique that significantly speeds up the cooling process for quantum computers. This innovation, led by Karan Mehta, assistant professor of electrical and computer engineering, was published in the journal PRX Quantum. The technique involves integrating optical components directly into a microfabricated chip, which delivers precisely controlled laser light, known as a standing wave, to trapped atoms. By positioning a trapped calcium ion at a point of minimum light intensity within this standing wave, energy is removed from its motion, suppressing unwanted heating. This method brings the ion's targeted motion close to its quantum ground state in approximately 150 microseconds, a substantial improvement compared to the 500 microseconds typically required by conventional laser arrangements. The integrated chip design allows for the delivery of multiple wavelengths of light needed to control the ion, a crucial step towards scaling up quantu...

DARPA-Sponsored Project Deploys Neutrino Detectors in Lake Superior to Hunt 'Ghost Particles'

DARPA-Sponsored Project Deploys Neutrino Detectors in Lake Superior to Hunt 'Ghost Particles'

A new scientific mission, sponsored by the Defense Advanced Research Projects Agency (DARPA) and led by the University of Minnesota Duluth, is deploying neutrino detectors in Lake Superior. This project, known as the Experimental Neutrino Detector, aims to detect neutrinos 200 meters below the lake's surface, marking the first time such detectors have been used in a freshwater lake. Neutrinos, often called 'ghost particles' due to their elusive nature, are subatomic particles that rarely interact with matter. The project utilizes five three-story-tall frames, each weighing 8,000 pounds and holding 18 spherical sensors filled with photo tubes. These photo tubes are designed to detect faint flashes of blue light emitted when neutrinos collide with atoms in the water. The system will differentiate neutrinos from a beam generated by Fermilab, aimed underground towards northern Minnesota, from other cosmic radiation.

Nuclear Regulatory Commission Issues First High-Temperature Gas-Cooled Reactor Construction Permit in Nearly 60 Years

Nuclear Regulatory Commission Issues First High-Temperature Gas-Cooled Reactor Construction Permit in Nearly 60 Years

The Nuclear Regulatory Commission (NRC) has issued a construction permit for the Long Mott Generating Station in Calhoun County, Texas. This marks the first construction permit for a high-temperature gas-cooled reactor in nearly 60 years and is the third advanced reactor construction permit issued by the NRC this year. Long Mott Energy plans to build a four-reactor facility, featuring four X-energy Xe-100 reactors. The primary purpose of this facility will be to generate high-temperature steam for industrial use at the Dow Seadrift Operations site, with excess electricity being exported to the grid. This permit represents several regulatory firsts for the NRC, including its first approval of a multimodule advanced reactor facility, a reactor with a pebble-bed core, a design with online nuclear refueling, and a review of a high-temperature gas-cooled reactor under the agency’s risk-informed, technology-inclusive Licensing Modernization Project framework. NRC staff completed the safety evaluation ahead of sc...

OpenAI AI Model Reportedly Proves Half of Yang-Mills Millennium Problem

OpenAI AI Model Reportedly Proves Half of Yang-Mills Millennium Problem

An AI model developed by OpenAI has reportedly proven half of the Yang-Mills problem, one of the seven Millennium Prize Problems established by the Clay Mathematics Institute. This significant development was first disclosed by OpenAI on October 26, with the model completing the proof in September. The work has received support from a review panel chaired by Nobel laureate David Gross, which also included Arthur Jaffe, a co-author of the problem's official statement. The proof was formalized using Lean, a computer language designed for line-by-line verification, ensuring rigorous accuracy. The Yang-Mills problem, established in 2000, carries a $1 million prize for its solution. However, to fully claim the prize, the mass gap must also be proven, and the work must meet the institute’s publication and two-year recognition requirements. This achievement highlights the growing capabilities of AI in tackling complex theoretical physics and mathematics.

Leibniz Supercomputing Centre Navigates Quantum Computing's Evolution Towards Practical Scientific Tool

Leibniz Supercomputing Centre Navigates Quantum Computing's Evolution Towards Practical Scientific Tool

The Leibniz Supercomputing Centre (LRZ) is actively involved in the evolving landscape of quantum computing, operating two Euro-Q-Exa systems on behalf of the EuroHPC Joint Undertaking. While quantum computers can operate independently, they still require control through classical systems and access via portals like LRZ's Munich Quantum Portal. LRZ emphasizes projects that include a classical High-Performance Computing (HPC) component when allocating computing time. The center is installing a new Euro-Q-Exa system expected to provide around 150 qubits capable of entanglement and gate operations at a defined quality level. This larger system is anticipated to make quantum computing substantially more interesting from an applications perspective, particularly for data-intensive fields such as Earth observation, chemistry, and materials science. Researchers are gaining opportunities to develop new algorithms for computation and data processing, moving quantum computing from an experimental field to a practica...

NRC Accelerates Advanced Nuclear Reactor Approvals, Issuing First Construction Permit for Industrial Site in Decades

NRC Accelerates Advanced Nuclear Reactor Approvals, Issuing First Construction Permit for Industrial Site in Decades

The Nuclear Regulatory Commission (NRC) has significantly accelerated its approval process for advanced nuclear reactors, marking a major shift in the U.S. nuclear energy industry. In a compressed timeframe, three advanced reactor developers received crucial regulatory clearances. Most notably, X-Energy and Dow secured the first construction permit ever issued by the NRC for an advanced nuclear plant located at an operating industrial facility. This permit allows for the construction of four Xe-100 high-temperature gas-cooled reactors at Dow’s Seadrift site in Texas. Each unit is designed to produce 80 megawatts electric and 200 megawatts thermal, intended to supply both electricity and high-temperature process steam to Dow’s chemical complex. This approval is significant as it is the first construction permit for a high-temperature gas-cooled reactor in nearly six decades, the first for a pebble-bed design, and the first for an advanced reactor co-located with active industrial operations. The review proc...

JQI Fellow Gretchen Campbell Elected Optica Fellow for Pioneering Atomtronics Research

JQI Fellow Gretchen Campbell Elected Optica Fellow for Pioneering Atomtronics Research

JQI Fellow Gretchen Campbell has been elected a 2027 fellow of Optica, an honor bestowed upon only 10% of Optica members. Campbell, who also serves as the Associate Vice President for Quantum Research and Education at the University of Maryland (UMD), was recognized for her pioneering work in the field of 'atomtronics.' This innovative research involves using light to create circuits with atoms, which act as analogs to electrons in electronics. Her experimental research group focuses on using ultracold clouds of atoms to study novel quantum phenomena, including the behavior of atoms combined into superfluids that flow without friction. Campbell's work aims to understand how collective quantum behavior can be controlled and applied, with the ultimate goal of developing practical devices like new sensors or gyroscopes for navigation.

Fudan University Researchers Develop High-Purity Barium Ion Qubit Loading Method

Fudan University Researchers Develop High-Purity Barium Ion Qubit Loading Method

Researchers at Fudan University have introduced a novel method for rapidly and selectively loading barium ion qubits from naturally abundant sources, eliminating the need for costly and time-consuming isotope enrichment. This advancement is crucial for scaling up quantum computing systems. The team developed a three-step photoionization scheme that uses specific laser wavelengths (791 nm, 554 nm, and 532 nm) to selectively populate ion traps with either ^(137)Ba+ or ^(135)Ba+ ions. This process, termed 'relayed selectivity,' effectively suppresses the excitation of unwanted isotopes, with no contaminant ions detected during experiments. The 791 nm excitation wavelength is key for initial isotope isolation due to its well-resolved isotope-shifted hyperfine structure, while the 554 nm resonant transfer further refines purity. The final ionization step uses a 532 nm Raman beam, avoiding the issues associated with ultraviolet lasers, such as inducing unwanted charging on the ion trap.

Oak Ridge National Laboratory Seeks Postdoctoral Researchers for Quantum Materials Electron Spectroscopy

Oak Ridge National Laboratory Seeks Postdoctoral Researchers for Quantum Materials Electron Spectroscopy

The Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National Laboratory (ORNL) is actively recruiting two Postdoctoral Research Associates. These positions are focused on advancing the development and application of next-generation electron microscopy and spectroscopy capabilities, specifically for investigating quantum materials. The successful candidates will contribute to novel scientific instrumentation and explore fundamental relationships between material structure, electronic behavior, and collective excitations. The research will involve developing and applying advanced approaches to momentum-resolved electron energy-loss spectroscopy (qEELS), with opportunities in instrument development, experimental measurements, computational modeling, and data-driven analysis. The roles are within the Electron Microscopy and Microanalysis (eMMA) Group of the Nanomaterials Characterization Section, part of ORNL’s Physical Sciences Directorate, and involve collaboration with other ORNL divisions and e...

New Research Highlights Information Loss in Submillimetre-Wave Atmospheric Sounding Due to Sideband Asymmetry

New Research Highlights Information Loss in Submillimetre-Wave Atmospheric Sounding Due to Sideband Asymmetry

New research evaluates the information loss in submillimetre-wave atmospheric sounding, specifically focusing on the impact of sideband asymmetry in double-sideband (DSB) detection. Microwave and submillimetre radiometric sounders typically use DSB detection, which combines signals from both lower and upper sidebands into a single channel. The study analytically demonstrates that when the observation sensitivities (Jacobians) of the two sidebands differ, information is lost compared to direct detection (DD), which samples these bands independently. This loss is quantified by comparing the retrieval errors of temperature, water vapor, and relative humidity at various frequencies. At the 368.49 GHz oxygen band, where sideband asymmetry is pronounced due to a nearby water-vapor line, DSB retrieval errors significantly exceed those of DD, particularly between 2 and 10 km altitude.

Quantum Computer Error Correction Faces Unexpected Complexity Due to Memory Effects

Quantum Computer Error Correction Faces Unexpected Complexity Due to Memory Effects

New research indicates that correcting errors in quantum computers may be more complicated than previously understood, posing significant challenges for making these devices practical. While quantum error-correction (QEC) techniques have advanced, several studies suggest that the nature of errors is unexpectedly complex, particularly due to "memory effects." These effects mean that errors a qubit makes at different times are not independent, violating the long-standing Markov assumption that errors are memoryless. Researchers, including Ioan Pop at the Karlsruhe Institute of Technology and Lorenza Viola at Dartmouth College, have found experimental evidence of long-lived defects and non-Markovian behavior in superconducting qubits. Analyses of experiments with Google's Willow quantum computer and IBM quantum computers have also revealed that current QEC models may not adequately account for these correlated errors, which could hinder the reliable operation of quantum computers as they scale.

Lund University Seeks Doctoral Student for Attosecond Physics Research in Quantum Information Science

Lund University Seeks Doctoral Student for Attosecond Physics Research in Quantum Information Science

Lund University's Division of Atomic Physics is seeking a doctoral student to join a research project focused on attosecond physics within the framework of Quantum Information Science and Ultrafast Nonlinear Control at the Attosecond Timescale (QU-ATTO) network. The research involves generating and applying extremely short light pulses in the attosecond and extreme ultraviolet range to study electron dynamics in atoms and molecules. The project specifically aims to improve a technique for tomographic reconstruction of entangled states in photoionization, focusing on reconstructing the density matrix of photoelectrons from ultrashort XUV pulses. This position is part of a Marie Sklodowska-Curie doctoral network, which includes specific eligibility requirements, such as not having worked in Sweden for the past five years, and offers a training network across Europe with 15 other PhD students. The successful candidate will engage in research projects and third-cycle courses, with potential for up to 20% depar...