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Core quantum computing developments, breakthroughs, and innovations

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Loop-string-hadron Approach Defines Operator Representation for SU(3) Lattice Yang-Mills Theory’s Trivalent Vertex
quantum-computing

Loop-string-hadron Approach Defines Operator Representation for SU(3) Lattice Yang-Mills Theory’s Trivalent Vertex

Understanding the strong force that binds quarks into protons and neutrons remains a central challenge in physics, and researchers continually seek more efficient ways to model this complex interaction. Saurabh V. Kadam from the University of Washington, Aahiri Naskar and Indrakshi Raychowdhury from BITS-Pilani, alongside Jesse R. Stryker from Lawrence Berkeley National Laboratory, now present a significant advance in this field, developing a new mathematical framework for studying the strong force using a technique called the Loop-String-Hadron approach. Their work establishes a standalone method for calculating properties of this force, surpassing the limitations of previous approaches and offering a substantial speed advantage for complex calculations. This achievement paves the way for faster, more accurate investigations into the fundamental building blocks of matter and the forces that govern them, promising to accelerate progress in understanding chromodynamics. This work represents the second part of a series focused on the Loop-String-Hadron (LSH) approach to SU(3) lattice Yang-Mills theory. The team presents an infinite-dimensional matrix representation for arbitrary gauge-invariant operators at a trivalent vertex, establishing a standalone framework for computations that surpasses the previously used Schwinger-boson framework. Consequently, they evaluate in closed form the result of applying any gauge-invariant operator to the LSH basis states introduced in their earlier research. SU3 Gauge Field Commutation Relations Calculated Scientists have meticulously calculated a comprehensive set of commutation relations for SU(3) gauge fields, essential for understanding the strong force described by quantum chromodynamics. These calculations form the foundation for lattice gauge theory, a non-perturbative approach that discretizes spacetime to enable numerical simulations. The operators defined within this framework represent the fundamental building blocks of t

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Tunable Density, Depth-Confined Nitrogen-Vacancy Centers in Diamond Achieve Twofold Improvement in Control
quantum-computing

Tunable Density, Depth-Confined Nitrogen-Vacancy Centers in Diamond Achieve Twofold Improvement in Control

Creating nitrogen-vacancy (NV) centres in diamond represents a significant step forward in nanoscale technology, and researchers are now achieving unprecedented control over their creation and properties. Lillian B. Hughes Wyatt, Shreyas Parthasarathy, Isaac Kantor, and colleagues at the University of California, Santa Barbara, have developed a method for engineering these defects with remarkable precision. Their technique, involving carefully controlled nitrogen doping during diamond growth, allows for tunable control over both the depth and density of NV centres, achieving a twofold improvement in depth confinement compared to existing methods. This advancement promises to enhance the sensitivity of nanoscale sensors and unlock new possibilities in fields ranging from nanoscale nuclear magnetic resonance to entanglement-enhanced metrology, as demonstrated by the team’s successful imaging of magnetism in the two-dimensional material CrSBr. Engineering shallow nitrogen-vacancy (NV) centers in diamond unlocks new possibilities for nanoscale quantum sensing. This research demonstrates that creating near-surface NVs through nitrogen doping during diamond growth allows for precise control over both NV depth and density, surpassing the limitations of traditional ion implantation. This ultimately results in highly-sensitive single defects and ensembles with coherence limited by interactions between neighboring NVs. NV Center Sensing of CrSBr Magnetism Scientists are leveraging nitrogen-vacancy (NV) centers in diamond as nanoscale sensors to detect magnetic fields. This research focuses on using these shallow NV centers to investigate the magnetic properties of chromium sulfide bromide (CrSBr), a two-dimensional material with promising magnetic characteristics. The goal is to achieve highly sensitive and spatially resolved magnetic field detection. Diamond samples were grown using a chemical vapor deposition process, with careful control over substrate orientation to optim

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Quantum Magnetic Sensing Enables Infrastructure-free Geo-localization with Cramér-Rao Lower Bound Saturation
quantum-computing

Quantum Magnetic Sensing Enables Infrastructure-free Geo-localization with Cramér-Rao Lower Bound Saturation

Modern navigation systems, dependent on satellite signals, face vulnerabilities to interference and obstruction, prompting researchers to explore alternative methods for determining location. Thinh Le, Shiqian Guo from North Carolina State University, and Jianqing Liu from North Carolina State University, investigate the potential of utilising the Earth’s magnetic field for precise geo-localization. Their work demonstrates how ultra-sensitive magnetometers, leveraging the properties of nitrogen-vacancy centres, can overcome limitations of traditional methods and achieve significant improvements in accuracy. By developing a distributed sensing protocol and a novel map-matching algorithm, the team proves the feasibility of infrastructure-free geo-localization, achieving sub-kilometre accuracy in challenging, high-gradient magnetic environments and demonstrating a substantial reduction in processing time compared to existing techniques. Earth’s Magnetic Field Guides Quantum Navigation Scientists are developing a groundbreaking navigation system that harnesses the Earth’s magnetic field, offering a robust alternative to vulnerable satellite-based technologies. This research investigates how highly sensitive magnetometers, utilizing nitrogen-vacancy (NV) centers in diamond, can enable precise positioning without relying on external signals. Researchers established a fundamental limit on the accuracy of magnetic field estimation using NV centers, demonstrating its superiority over conventional magnetometer technologies and employing a practical distributed protocol designed to approach this theoretical limit. The core of this system formulates geo-localization as a map-matching problem, introducing a sophisticated search strategy that operates in two distinct ways. This strategy analyzes both local variations in the magnetic field and directly compares raw field samples to a pre-existing magnetic map. Building on these foundations, researchers developed a global path plan

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Nord Quantique Receives $16 Million in Non-Dilutive Funding Through Canadian Quantum Champions Program
quantum-computing

Nord Quantique Receives $16 Million in Non-Dilutive Funding Through Canadian Quantum Champions Program

Insider Brief Nord Quantique has been selected for Phase 1 of Canada’s Quantum Champions Program, receiving up to $16M USD (CA $23M) in non-dilutive federal funding to advance scalable quantum computing. The funding supports technical validation and benchmarking by the National Research Council of Canada, focusing on Nord Quantique’s superconducting bosonic qubit architecture and hardware-efficient error correction. Nord Quantique plans to expand its team and laboratory capacity in 2026 as it advances toward utility-scale quantum systems and strengthens Canada’s domestic quantum supply chain. PRESS RELEASE — Nord Quantique, a leading builder of quantum  computers, today announces it will receive up to $16 million (CA $23 million) as part of Phase 1 of the newly created Canadian Quantum Champions Program (CQCP). This new Canadian Government initiative, led by Innovation, Science and Economic Development Canada (ISED), is designed to support  the development of scalable and useful quantum computers in Canada, by Canadian companies. As a  part of the CQCP, the National Research Council of Canada will establish the Benchmarking Quantum  Platforms initiative to undertake an expert assessment of the underlying quantum technologies, working  closely with the companies. This initiative will use an interdisciplinary, science-based approach to  evaluate each company’s technical progress.  Nord Quantique was selected for CQCP thanks to the capabilities of its patented superconducting  quantum circuits, which correct errors at the individual qubit level and accelerate progress toward  utility-scale quantum computing. The company is recognized globally for its pioneering work in bosonic  qubit architectures and hardware-efficient quantum error correction, enabling longer coherence times  and scalable logical qubit designs required to reach utility-scale.  “This is a crucial step in accelerating the development of Canada

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Spinors and Bell’s Theorem: Research Isolates Algebraic Origin of Contradiction in Two-Particle Systems
quantum-computing

Spinors and Bell’s Theorem: Research Isolates Algebraic Origin of Contradiction in Two-Particle Systems

The fundamental nature of quantum entanglement and its incompatibility with classical physics remains a central question in modern science, and researchers continually refine our understanding of this phenomenon. G. A. Koroteev rigorously demonstrates the algebraic origin of the Bell contradiction, revealing why quantum correlations cannot be explained by any classical model relying on shared hidden variables. The work isolates the precise mathematical mismatch between the noncommutative algebra describing spin and the commutative algebra required for classical probability, effectively proving the impossibility of representing quantum spin with a classical spin-vector model. This achievement provides a new perspective on the Bell-CHSH scenario, framing the contradiction not as a probabilistic paradox, but as an inherent algebraic incompatibility between quantum and classical descriptions of reality. Bell’s Theorem and Quantum Index Algebra This research explores the foundations of Bell’s theorem, demonstrating that the violation of Bell’s inequality isn’t simply a probabilistic anomaly, but a direct consequence of the algebraic structure governing quantum systems, particularly the spin of particles. Scientists investigated how the inherent noncommutativity of spin prevents a classical explanation of quantum correlations, focusing on the Quantum Index Algebra (QIA) which naturally captures this noncommutativity, providing a consistent way to represent spin and entanglement. Researchers demonstrate that a common mistake in interpreting Bell’s theorem is assuming all possible measurement outcomes can be simultaneously defined as classical random variables within a single probability space, an assumption incompatible with the true nature of spin. The study reveals that observed quantum correlations cannot be reproduced if one attempts to force the system into a classical, commutative framework. The core result is that the noncommutative algebra of spin, represented by t

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