Articles tagged with Quantum Measurement
Researchers have discovered that electrons in certain quantum materials behave like a viscous fluid, allowing for the detection of terahertz waves. This breakthrough enables faster data transfer and advanced medical imaging technologies.
Researchers at the University of Colorado Boulder have developed a new quantum timekeeper that combines four different clocks into one, allowing for increased precision. The device uses entanglement to reduce uncertainty in its ticking, enabling it to beat benchmark standards for optical atomic clocks.
A new study by Prof. Yaron Bromberg and Dr. Ohad Lib from the Hebrew University of Jerusalem has made significant progress in quantum computing through photonic-measurement-based quantum computation. They successfully generated cluster states with over nine qubits at a frequency of 100 Hz, overcoming scalability barriers.
Researchers at Tohoku University have successfully applied quantum squeezing to enhance the accuracy of measurements in complex quantum systems. By reducing uncertainty in one aspect while increasing it in another, they can measure variables like position and momentum with greater precision.
Physicists propose a refined way to test the validity of alternative quantum models, which offer a possible explanation for quantum-classical transition. The team found big differences with previous expectations for low-energy X-ray radiation, depending on atomic species and specific collapse model.
Researchers at the University of Stuttgart have developed a breakthrough in quantum microscopy that allows them to observe the collective motion of electrons in materials. By studying the effect of impurities on these movements, they hope to develop materials with desired properties and create ultra-fast switching materials.
Researchers at the University of California - Riverside have proposed a chain of quantum magnetic objects called spin centers that can simulate exotic magnetic phases of matter. This breakthrough could lead to more efficient ways of storing and transferring information, as well as the development of room temperature quantum computers.
Physicists at the University of Cologne have discovered that magnetic elementary excitations in BaCo2V2O8 crystals are bound by both attractive and repulsive interactions. The study found that repulsively bound states, which were unexpected due to their lower stability, can exist in these materials.
A team of researchers has developed a platform to probe, interact with and control quantum systems in silicon. They used an electric diode to manipulate qubits inside a commercial silicon wafer, exploring how the defect responds to changes in the electric field and tuning its wavelength within the telecommunications band.
An international research team uses wavefunction matching to overcome computational challenges in ab initio methods for nuclear physics. By transforming realistic high-fidelity interactions into easily computable ones, they can perform accurate calculations that match real-world data on nuclear properties.
A team of researchers created a single negatively charged lead-vacancy center in diamond, which emits photons with specific frequencies not influenced by the crystal's vibrational energy. This characteristic makes the PbV center a promising building block for large-scale quantum networks.
Scientists at ETH Zurich create an artificial solid with switched-on interactions using magnetic fields, observing surprising topological effects. The study reveals the ability to transport particles by one lattice site, mimicking a screw's motion, and demonstrates robustness against disorder.
A German-Chinese team at Goethe University Frankfurt has successfully visualized the temporal evolution of electron waves using the Kapitza-Dirac effect. The researchers measured the time-dependent interaction between free electrons and ultrashort laser pulses, opening up exciting applications in quantum physics.
The Princeton Plasma Physics Laboratory has opened a new Quantum Diamond Lab to study plasma processes for creating diamond material with unique properties. Scientists aim to harness this material for quantum computing, secure communication, and precise measurements, enabling breakthroughs in fields like medicine and energy.
Physicists at the University of Southampton successfully detect weak gravitational pull on microscopic particles using a new technique. The experiment, published in Science Advances, could pave the way to finding the elusive quantum gravity theory.
Researchers at MIT have observed a rare electronic state in which electrons become fractions of their total charge without the need for external magnetic fields. This effect, known as the fractional quantum anomalous Hall effect, has significant implications for the development of topological quantum computing.
Perovskite quantum dots made brighter by surface treatment with phospholipids, enabling higher photon emission rates. Coherent coupling of exciton dipoles boosts superradiance, making the dots even brighter for quantum technologies.
Researchers at Rice University have developed a new experimental technique that preserves quantum coherence in ultracold molecules for a significantly longer time. By using a specific wavelength of light, the 'magic trap' delays the onset of decoherence, allowing scientists to study fundamental questions about interacting quantum matter.
Researchers at MIT recreate a 'quantum bomb tester' using bouncing droplets, finding that the droplet's classical dynamics give rise to similar statistical behavior as predicted by quantum mechanics. The study bridges the gap between two realities, offering insight into quantum behavior from a local realist perspective.
Researchers have successfully excited a scandium-45 nuclear isomer using X-ray pulses, paving the way for the creation of the world's most precise clock. The breakthrough has significant implications for fields such as nuclear physics, satellite navigation, and telecommunications.
Scientists generate multiple quasiparticles simultaneously in a quantum gas and observe their complex interactions, including attractive and repulsive behavior. Quantum statistics plays a crucial role in these interactions, which are essential for understanding fundamental mechanisms of nature.
Researchers successfully controlled spin waves by using a superconducting electrode, which acts as a mirror to reflect the magnetic field back to the spin wave. This breakthrough offers an energy-efficient alternative to electronics and opens doors for designing new circuits based on spin waves and superconductors.
Researchers at Google Quantum AI and Stanford University have observed the crossover between two regimes: interactions dominating and measurements dominating. They also demonstrated novel quantum teleportation by measuring all but two distant qubits, generating stronger entanglement between them.
Researchers at OIST have developed a quantum engine that uses the principles of quantum mechanics to create power, replacing traditional fuel-based methods. The engine's efficiency can reach up to 25% and has potential applications in devices such as batteries and sensors.
The University of Science and Technology of China has made a significant breakthrough in exploring exotic spin interactions using solid-state spin quantum sensors. Their research findings provide valuable insights into these interactions, allowing for precise measurements of various spin phenomena.
Researchers at MIT have developed a novel superconducting qubit architecture that can perform operations between qubits with high accuracy, exceeding 99.9% for two-qubit gates and 99.99% for single-qubit gates. The new design utilizes fluxonium qubits, which have longer lifespans than traditional transmon qubits.
Researchers have demonstrated a way to perform Bell-state measurements with an efficiency exceeding the commonly assumed upper theoretical limit. This breakthrough opens up new perspectives for photonic quantum technologies and could lead to more efficient quantum computing, communication, and sensor devices.
Researchers at Duke University used a quantum computer to measure the geometric phase in light-absorbing molecules, which puts limitations on molecular transformations. This breakthrough allows for direct measurement of a long-standing fundamental question in chemistry, critical to processes like photosynthesis and vision.
Researchers from Hiroshima University found that measurements shape observable reality, suggesting a context-dependent understanding of quantum superpositions. This approach resolves the paradox of conflicting results in quantum experiments and provides evidence against reducing reality to material building blocks.
Quantum ghost imaging allows 3D imaging on a single photon level, enabling the lowest photon dose possible. The technique can be applied to image materials and tissues sensitive to light or drugs without risk of damage.
Researchers have discovered Rydberg moiré excitons in WSe2 monolayer semiconductor adjacent to graphene, exhibiting multiple energy splittings and a pronounced red shift. The discovery holds promise for applications in sensing and quantum optics due to the strong interactions with the surroundings.
A team at the University of Washington has made a breakthrough in quantum computing by detecting signatures of 'fractional quantum anomalous Hall' (FQAH) states in semiconductor materials. This discovery marks a significant step towards building stable qubits and potentially developing fault-tolerant quantum computers.
Researchers have developed an innovative approach to efficiently manipulate topological edge states for optical channel switching. By exploiting the finite-size effect in a two-unit-cell optical lattice, they achieved dynamic control over topological modes and demonstrated robust device performance.
Researchers at Aalto University create a new bolometer that can accurately measure microwave power down to the femtowatt level at ultra-low temperatures. This breakthrough device has the potential to significantly advance quantum computing and technology, enabling more precise control over qubits and improving overall performance.
Researchers have made a quantum matter breakthrough by tuning density waves in a unitary Fermi gas, creating a new type of matter with extreme interactions. This discovery could lead to a better understanding of complex materials and potentially improve the development of quantum-based technologies.
A new laser-based breathalyzer using artificial intelligence can detect COVID-19 in real-time with excellent accuracy. The technology, powered by frequency comb spectroscopy and machine learning, analyzes the unique chemical fingerprint of each breath sample to identify specific health conditions.
An international research team has confirmed for the first time that mutual information in a many-body quantum system scales with surface area rather than volume. The experiment used ultracold atoms and a special tomography technique to measure the shared information.
A team of researchers has achieved unparalleled precision in measuring the time delay between two photons using frequency-resolving sampling measurements. This breakthrough enables faster and more efficient characterisation of nanostructures, including biological samples and nanomaterial surfaces.
Researchers at Argonne National Laboratory and University of Chicago developed a hybrid simulation process using IBM quantum computers to solve electronic structure problems. The new method uses classical processing to mitigate noise generated by the quantum computer, paving the way for future improvements.
Researchers from ETH Zurich have achieved groundbreaking cooling of a glass nanoparticle along two directions of motion, overcoming the 'Dark Mode Effect'. This breakthrough enables the creation of fragile quantum states and paves the way for ultrasensitive gyroscopes and sensors.
Researchers used a self-developed quantum spin amplifier to detect exotic parity-violation interactions beyond the standard model, improving previous limits by at least five orders of magnitude. The experiment has provided new constraints on dark matter and complemented existing models.
Scientists at Ohio State University have made a groundbreaking discovery, allowing them to view inside the deepest recesses of atomic nuclei. By studying how different types of particles interact with each other, they were able to map the arrangement of gluons within atomic nuclei with unprecedented precision.
Researchers at MIT have proposed a new approach to making qubits and controlling them using beams of light from two lasers of slightly different colors. This method enables the direct manipulation of nuclear spin, allowing for precise identification and mapping of isotopes, as well as improved coherence times for quantum memory.
Researchers from Nanjing University have proposed the first scheme to practically generate N-photon states deterministically using a lithium-niobate-on-insulator platform. The scheme involves deterministic parametric down-conversion and demonstrates feasibility for generating multiphoton qubit states.
A team of researchers developed a model-free approach using deep reinforcement learning to optimize estimation of multiple parameters in quantum sensors. The protocol achieved significantly better estimations compared to nonadaptive strategies, demonstrating enhanced performance in resource-limited regimes.
Scientists at Stanford University and SLAC National Accelerator Laboratory have made progress toward building a novel quantum simulator. The device can simulate interactions between two quantum objects, paving the way to study complex systems and answer fundamental questions in physics.
Researchers at University of Copenhagen and Ruhr University Bochum have made a groundbreaking discovery, solving a long-standing problem in quantum physics. They can now control two quantum light sources, enabling the creation of quantum mechanical entanglement, a phenomenon with sci-fi-like properties.
Researchers at IBS CSLM discovered pair quasiparticles in a classical system of microparticles driven by viscous flow. These long-lived excitations exhibit anti-Newtonian forces that stabilize pairs, similar to the behavior of Dirac quasiparticles in graphene.
Researchers have developed a novel way to measure a quantum device's accuracy by analyzing universal statistical patterns in the noise. This approach takes advantage of the way information is scrambled in quantum systems, allowing for more efficient error detection and verification.
Researchers report the discovery of photonic hopfions, a new family of 3D topological solitons with freely tunable textures and numbers. These structures exhibit robust topological protection, making them suitable for applications in optical communications, quantum technologies, and metrology.
Physicists at the University of Innsbruck have demonstrated a new nonlinear cooling method, allowing massive objects to be cooled to nearly absolute zero. This breakthrough enables the observation of quantum effects on macroscopic objects, paving the way for highly sensitive quantum sensors.
A new method bridges the quantum and classical worlds, enabling interaction-free detection of microwave pulses with a superconducting circuit. This breakthrough demonstrates genuine quantum advantage using a simpler setup, with potential applications in quantum computing, optical imaging, and cryptographic key distribution.
Computer simulations demonstrate that chaos plays a crucial role in the emergence of thermodynamic behavior from quantum theory. A quantum system with indistinguishable particles and a thermometer-like particle shows a temperature distribution consistent with Boltzmann's rules only when the system exhibits chaos.
Genuine multipartite entanglement, a potent form of entanglement for quantum info processing, has been certified in arbitrary sizes and forms using a new method. The new method, which decomposes the internal structure of the system, proves the existence of genuine multipartite entanglement in weakly entangled states.
Scientists at Tel Aviv University have developed a method to create the thinnest possible ladder steps made of distinct electric potentials, which can be used as independent information units. The discovery enables the creation of novel devices with potential applications in electronics and optomechanics.
A team of researchers has developed a prototype of a quantum microscope that can see electric currents, detect fluctuating magnetic fields, and even see single molecules on a surface. The microscope uses atomic impurities and van der Waals materials to achieve high resolution sensitivity and simultaneous imaging of magnetic fields and ...
Physicists have observed novel quantum effects in a topological insulator at room temperature, opening up new possibilities for efficient quantum technologies. This breakthrough uses bismuth-based topological materials to bypass the need for ultra-low temperatures.
Scientists at Swinburne University of Technology and FLEET collaborators observe and explain signatures of Fermi polaron interactions in atomically-thin WS2 using ultrafast spectroscopy. Repulsive forces arise from phase-space filling, while attractive forces lead to cooperatively bound exciton-exciton-electron states.
Researchers from HKU and Harvard University have developed a new triangular lattice model and sweeping cluster algorithm to simulate Rydberg arrays. Their simulations reveal highly entangled Z2 quantum spin liquids with large parameter regimes, providing valuable insights for future experiments.
A team led by Prof. Alan Tennant and Dr Allen Scheie gain deeper insights into the interactions between spins in KCuF3, a simple model material for Heisenberg quantum spin chain. They use neutron scattering to study spatial and temporal evolution of spins.