quantum systems

Researchers develop platform to control qubits in silicon defects for quantum communications

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The dream of a quantum internet, one capable of unprecedented levels of security and computational power, is tantalizingly close. Making this dream a reality would be significantly more feasible if we could harness existing telecommunications technologies and infrastructure. Recently, researchers have made significant strides in this direction by exploring defects in silicon—a ubiquitous semiconductor material—as … Read more

New method for quieting the quantum world

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One of the biggest challenges in quantum technology and quantum sensing is “noise”–seemingly random environmental disturbances that can disrupt the delicate quantum states of qubits, the fundamental units of quantum information. Looking deeper at this issue, JILA Associate Fellow and University of Colorado Boulder Physics Assistant Professor Shuo Sun collaborated with Andrés Montoya-Castillo, Assistant Professor … Read more

Grain structure of diamond nanoparticles found to affect silicon vacancy center performance

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They say that one can miss the forest for the trees. But it’s often worth taking a closer look at the trees to make sense of the dense, brambly whole. That’s what a Stanford University group did to tackle a thorny quantum-information problem in diamond. A star material for hosting quantum information, diamond nevertheless presents … Read more

Quantum system-on-chip architecture for large-scale quantum computing

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Quantum computers hold the promise of solving extremely complex problems rapidly—tasks that could take the world’s most powerful supercomputers decades to crack. However, achieving such performance requires building a system with millions of interconnected qubits. The creation and control of such vast numbers of qubits in a hardware architecture is a formidable challenge that scientists … Read more

New approach uses non-gaussian states to describe and control spin-boson systems in quantum devices

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Many of today’s quantum devices rely on collections of qubits, also called spins. These quantum bits have only two energy levels, the “0” and the “1.” However, spins in real devices also interact with light and vibrations known as bosons, greatly complicating calculations. In a new publication in Physical Review Letters, researchers in Amsterdam demonstrate … Read more

Scientists achieve chip-scale entangled photon source in silicon carbide

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Quantum information science is truly fascinating—pairs of tiny particles can be entangled such that an operation on either one will affect them both even if they are physically separated. A seemingly magical process called teleportation can share information between different far-flung quantum systems. These different systems can be coupled using quantum processes to form quantum … Read more

Harvard-led review examines progress in majorana research for quantum computing

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Named after an Italian theoretical physicist, Majoranas are complex quasiparticles that could be the key to building next-generation quantum computing systems. Most materials contain many electrons, each of which has a negative charge and a type of intrinsic quantum momentum known as spin. Interactions between electrons in some materials can produce emergent particles, or particles … Read more

Researchers discover new entropy rule for quantum entanglement transformations

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Bartosz Regula, from the RIKEN Center for Quantum Computing, and Ludovico Lami, from the University of Amsterdam, have unveiled a groundbreaking discovery regarding the elusive nature of quantum entanglement. Their findings, rooted in probabilistic calculations, shed light on a long-hypothesized rule of entropy governing quantum entanglement, a phenomenon central to the potential power of future … Read more

New blueprint for quantum error correction uses qLDPC codes and reconfigurable atom arrays

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The fragile qubits that make up quantum computers offer a powerful computational tool, yet also present a conundrum: How can engineers create practical, workable quantum systems out of bits that are so easily disturbed—and wiped of data—by tiny changes in their environment? Engineers have long struggled with how to make quantum computers less error-prone, often … Read more

Repulsive forces induce ferromagnetism in quantum active matter model

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Researchers Kazuaki Takasan and Kyogo Kawaguchi of the University of Tokyo with Kyosuke Adachi of RIKEN, Japan, have demonstrated that ferromagnetism, an ordered state of atoms, can be induced by increasing particle motility and that repulsive forces between atoms are sufficient to maintain it. The discovery not only extends the concept of active matter to … Read more

Efficient generation and control of entanglement in superconducting qubit arrays demonstrated

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Entanglement is a fascinating phenomenon in the realm of quantum physics, where particles at the atomic level exhibit correlations that defy classical explanations. This unique aspect of quantum mechanics plays a pivotal role in understanding the behavior of quantum systems, particularly in the context of quantum computing. Quantum entanglement refers to the intricate correlation between … Read more

Quantum algorithm revolutionizes simulation of coupled oscillators with exponential speedup

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The concept of “coupled oscillations” may not immediately ring a bell, but these phenomena are ubiquitous in nature, manifesting in a variety of systems from mechanical structures to atomic bonds and gravitational interactions. Coupled harmonic oscillators, describing the interactions between masses and springs, serve as a foundational model in science and engineering, offering insights into … Read more

Researchers develop world’s first quantum-gas microscope for strontium atoms

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Quantum physics requires high-precision sensing techniques to delve deeper into the microscopic properties of materials. From the analog quantum processors that have emerged recently, quantum-gas microscopes have proven to be powerful tools for understanding quantum systems at the atomic level. These devices produce images of quantum gases with very high resolution: They allow individual atoms … Read more

Artificial solid with switchable interactions exhibits topological effects in transport

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In principle, one shouldn’t compare apples to oranges. However, in topology, which is a branch of mathematics, one must do just that. Apples and oranges, it turns out, are said to be topologically the same since they both lack a hole—in contrast to doughnuts or coffee cups, for instance, which both have one (the handle … Read more

Quantum Mechanics: Mysteries of the Subatomic World

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Quantum mechanics is one of the most profound and revolutionary theories in modern physics, unraveling the mysteries of the subatomic world and fundamentally transforming our understanding of matter, energy, and the fundamental forces of nature. Developed in the early 20th century through the works of pioneering physicists such as Max Planck, Albert Einstein, Niels Bohr, … Read more

Quantum Entanglement: A Journey into Non-locality

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Quantum entanglement is a fascinating and perplexing phenomenon in the realm of quantum mechanics, challenging our classical intuitions about the nature of reality. It is a concept that has captured the imagination of scientists and the public alike, leading to deep philosophical discussions and groundbreaking technological advancements. This journey into non-locality takes us into the … Read more

Scientists amplify quantum interactions in micron-sized particles, advancing quantum physics research

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The question of where the boundary between classical and quantum physics lies is one of the longest-standing pursuits of modern scientific research, and in new research published today, scientists demonstrate a novel platform that could help us find an answer. The laws of quantum physics govern the behavior of particles at miniscule scales, leading to … Read more

1,000-qubit milestone achieved for quantum processors

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Making quantum systems more scalable is one of the key requirements for the further development of quantum computers because the advantages they offer become increasingly evident as the systems are scaled up. Researchers at TU Darmstadt have recently taken a decisive step toward achieving this goal. Quantum processors based on two-dimensional arrays of optical tweezers, … Read more

New thermometry method reveals cooling effect in compressed quantum gases

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An international collaboration between researchers from Innsbruck and Geneva has unveiled a groundbreaking thermometry method tailored for measuring temperatures in low-dimensional quantum gases. Surprisingly, their findings suggest that compressing a gas may lead to cooling—a counterintuitive phenomenon that challenges conventional wisdom. Published in Science Advances, this study marks a significant milestone in our understanding of … Read more

Study proposes two-laser control scheme for enhancing quantum simulator power

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Creating a quantum computer powerful enough to tackle problems we cannot solve with current computers remains a big challenge for quantum physicists. A well-functioning quantum simulator—a specific type of quantum computer—could lead to new discoveries about how the world works at the smallest scales. Quantum scientist Natalia Chepiga from Delft University of Technology has developed … Read more