Physicists create new form of light
Researchers observe groups of three photons interacting, forming a new kind of photonic matter. The bound photons acquire mass and travel slower than non-interacting photons.
Quantum Measurement
Articles tagged with Quantum Measurement
Controlling quantum interactions in a single material
A team of researchers has successfully controlled multiple quantum mechanical properties in a single material, including ferroelectricity and conductivity. The breakthrough could lead to the development of ultrafast, low-power electronics and quantum computers.
Scientists demonstrate one of largest quantum simulators
Physicists at MIT and Harvard University have developed a new technique to manipulate quantum bits by trapping and arranging individual atoms. This breakthrough enables the simulation of complex systems like materials and optimization problems, such as the traveling salesman problem, exponentially faster than classical computers.
A step forward for quantum computing
A team of physicists from Harvard University has developed a special type of quantum computer, known as a quantum simulator, which is programmed by capturing super-cooled rubidium atoms with lasers. The system could shed new light on material properties and complex optimization problems.
Quantum simulators wield control over more than 50 qubits, setting new record
Scientists have developed quantum simulators that can control over 50 interacting atomic qubits, mimicking magnetic quantum matter. The new record surpasses previous demonstrations and enables simulations of complex quantum matter, previously unreachable by modern supercomputers.
Quantum systems correct themselves
Researchers developed a new method to protect quantum information in trapped ions by leveraging dissipation. The approach allows for autonomous correction of quantum states without requiring logical circuits or measurements.
Swansea University's physicists develop a new quantum simulation protocol
Researchers have developed a new quantum simulation protocol to understand key properties of interacting quantum field theories. The protocol uses cold atoms as controllable quantum sensors to measure the generating functional, a fundamental concept in quantum field theory.
Army refines recipe for quantum-enhanced technologies
Researchers at US Army Research Laboratory have made breakthroughs understanding entanglement structure in quantum systems with long-range interactions. Entanglement enables ultra-secure communication, precise measurement, and powerful computers.
Quantum ruler for biomolecules
Researchers at the University of Vienna developed a quantum ruler for biomolecules using a novel arrangement of nanogratings and laser beams. The technique allows for precise measurement of molecular electronic properties, such as those of vitamins A, E, and K1, with high accuracy.
Shaking Schroedinger's cat
Researchers at Washington University in St. Louis have discovered that quasimeasurements, a new type of measurement interaction, cause the quantum Zeno effect and anti-Zeno effect. The disturbance from these measurements shifts the energy levels of the atom, leading to faster or slower decay rates.
Physicists use numerical 'tweezers' to study nuclear interactions
Researchers created a numerical 'tweezers' tool to study nucleus interactions, finding that local forces play a crucial role in determining attraction or repulsion. The study sheds light on the parameters controlling these nuclear forces, which inform nuclear structure.
Research reveals novel quantum state in strange insulating materials
Scientists have confirmed novel theoretical work on Mott insulators, revealing a unique form of magnetism that arises when these materials are cooled below a critical temperature. This discovery helps to shed light on the complex interactions between electrons in these materials, which are crucial for developing new electronic devices.
Quantum simulation technique yields topological soliton state in SSH model
Researchers at the University of Illinois used quantum simulation to replicate the properties of a topological insulator, directly observing its protected boundary state. This breakthrough enables further investigations into topological systems and their unique transport properties.
Watching quantum jumps
Researchers at TU Wien and Germany have developed a method to study the time structure of quantum jumps, which are extremely fast state changes in atoms. The experiment showed that the duration of two different ionization processes can be distinguished, revealing new insights into the physics of ultrashort time scales.
Waterloo-led experiment achieves the strongest coupling between light and matter
Researchers at University of Waterloo's IQC recorded interaction 10 times larger than previously seen between photons and qubit, enabling investigation of light-matter interactions in a new domain. The ultrastrong coupling may lead to exploration of new physics related to biological processes, exotic materials, and relativistic physics.
How shaping light can change particle behavior
The study found that higher order modes trap and move particles more rapidly than fundamental modes, with the collective particle speed slowing down when more particles are added. The results also showed that interparticle distances were smaller in higher order modes.
Novel state of matter: Observation of a quantum spin liquid
Researchers have observed a novel state of matter with quantum spin liquid properties in calcium-chromium oxide monocrystals. Despite conventional expectations, the spins remain collective and dynamic even at extremely low temperatures, exhibiting unique behavior.
Controlling quantum states atom by atom
A team of researchers has developed a method to precisely alter the quantum mechanical states of electrons in an array of quantum boxes. This allows for the investigation of interactions between various types of atoms and electrons, crucial for advancing quantum technologies.
Photon collisions: Photonic billiards might be the newest game!
Researchers from the Henryk Niewodniczanski Institute of Nuclear Physics have observed elastic collisions between photons in heavy ion collisions. The study predicts that some deflected photons could hit detectors installed by ATLAS, CMS, and ALICE projects.
Three-way battles in the quantum world
Researchers create a quantum simulator to study novel phase transitions resulting from energetic three-way battles between interaction energy, motional energy and long-range interaction.
China scientists visualize coherent intermolecular dipole-dipole interactions
Researchers successfully mapped spatial distribution of excitonic coupling in well-defined arrangements of zinc-phthalocyanine molecules. They also observed enhanced single-molecule superradiance for in-line arrangements of up to four molecules.
Quantum simulation 2.0: Atoms chat long distance
Researchers at the University of Innsbruck have successfully measured long-range magnetic interactions between ultracold erbium atoms in an optical lattice. This achievement marks an important step towards understanding exotic quantum phases and the behavior of dipolar atoms.
Researchers demonstrate a new way to characterize twisted light
Twisted light has been characterized using a new method that involves obtaining the Wigner distribution, which completely describes a system in terms of two conjugate variables. This technique is suitable for quantum information applications involving a large number of orbital angular momentum states.
Entanglement becomes easier to measure
Researchers have developed a new method to detect entanglement in many-particle systems, overcoming the challenge of scaling exponentially with system size. This breakthrough allows for the quantification of entanglement in macroscopic objects and has applications in quantum metrology, simulations, and solid-state physics.
Physicists discover new laws governing the 'developmental biology of materials'
Researchers at the University of Toronto have discovered a new set of rules governing the formation of materials with unusual properties, including superconductivity and superfluidity. By studying ultracold atomic interactions, they found a new type of pressure that arises from p-wave interactions.
Spin dynamics in an atomically thin semi-conductor
Researchers at the National University of Singapore and Yale-NUS College have established the mechanisms for spin motion in molybdenum disulfide. This discovery resolves a research question on electron spin properties in single layers of 2D materials, paving the way for next-generation spintronics devices with lower energy consumption.
A quantum of light for material science
Researchers at the Max Planck Institute have developed a novel theoretical method to simulate material properties, including the effects of photons. This approach treats particles and photons as a quantum fluid, allowing for accurate descriptions of electron-photon interactions.
Laser-wielding physicists seize control of atoms' behavior
Researchers have successfully tuned lasers to manipulate atoms' interactions in a Bose-Einstein condensate, allowing for exotic states of matter. This breakthrough enables the exploration of unusual quantum phenomena and the engineering of novel quantum devices.
A little light interaction leaves quantum physicists beaming
Researchers create interaction between single photon and rubidium atoms, enabling new field of optics. This breakthrough advances development of quantum computers by demonstrating useful ways to get photons to interact with each other.
Molecular trick alters rules of attraction for non-magnetic metals
Researchers at the University of Leeds have successfully altered quantum interactions to generate magnetism in non-magnetic metals by removing electrons using a carbon molecule interface. This breakthrough enables the use of abundant and harmless elements like carbon and copper, crucial for future technologies such as quantum computers.
Good quantum states and bad quantum states
Scientists from TU Wien and Free University of Berlin developed a quantum tomography method to measure and describe large quantum systems precisely with few measurements. This technique uses continuous matrix product states, which represent a vanishingly small fraction of all possible states but are physically important.
Advance in quantum error correction
Researchers have developed a new quantum error correction code that can correct errors afflicting a specified fraction of qubits, not just the square root of their number. This protocol requires little measure of quantum states and can correct virtually all errors in quantum memory.
Putting a new spin on plasmonics
Researchers at Aalto University have discovered a new method to enhance the polarization of light in ferromagnetic materials. By patterning magnetic materials into arrays of nanoscale dots, they can create highly controllable modifications of light polarization when it reflects from the array. This breakthrough has the potential to adv...
Quantum physics -- hot and cold at the same time
Researchers at Vienna University of Technology discovered that a cloud of atoms can exhibit multiple temperatures at once. The experiment utilized a microchip to cool the gas near absolute zero, allowing scientists to measure its behavior. This breakthrough helps understand the fundamental laws of quantum physics and their relationship...
OU physicists first to create new molecule with record-setting dipole moment
Researchers at the University of Oklahoma have successfully created a new molecule with an unprecedented electric dipole moment, opening up potential pathways for the development of scalable quantum computers. The molecule's unique property allows it to react with electric fields like a bar magnet reacts with magnetic fields.
Researchers snap-shot fastest observations of superconductivity yet
The study used infinitely short light pulses to observe ultrafast changes in superconductors, supporting the hypothesis that electron interactions are delayed and mediated by other electrons. The snap-shot observations took only 10 femtoseconds, a record-breaking achievement for material scientists.
Doing more with less: Steering a quantum path to improved internet security
Physicists at Griffith University demonstrate the potential for quantum steering to be used to enhance data security over long distances. This technique allows for perfectly secure communication between two parties without requiring absolute trust in devices, making it suitable for scenarios where standard methods fail.
A grant to see molecules in 3-D
The Pitt Quantum Repository aims to create an open, mobile-ready database of accurate quantum calculations for molecules. This will enable students to visualize and understand molecular structures in 3D, improving learning outcomes.
String field theory could be the foundation of quantum mechanics
Researchers propose a connection between string field theory and quantum mechanics, suggesting that string field theory could be the basis of all physics. They showed that fundamental quantum mechanical principles can be derived from the geometry of strings joining and splitting in string field theory.
Two photons strongly coupled by glass fiber
Scientists at Vienna University of Technology have successfully created a strong interaction between two single photons using an ultra-thin glass fiber. This technique enables the creation of maximally entangled photon states required in quantum teleportation and light-transistors for quantum computing.
Griffith scientists propose existence and interaction of parallel worlds
Researchers at Griffith University challenge quantum science foundations with a new theory proposing the existence of interacting parallel universes. This approach could explain quantum mechanics' bizarre phenomena and has potential implications for molecular dynamics and testing the existence of other worlds.
Physicists' simple solution for quantum technology challenge
Researchers have developed a new technique using electromagnetic induction to create a flexibly designed microscopic trap for atoms. This breakthrough could revolutionize the development of quantum technologies, including high-precision sensors and superfast computers.
Princeton scientists observe elusive particle that is its own antiparticle
Researchers at Princeton University have captured an image of a Majorana fermion, a particle that exhibits properties of both matter and antimatter. The discovery could yield powerful computers based on quantum mechanics, as the particle's stability allows it to interact weakly with its environment.
Are weak values quantum? Don't bet on it
Weak measurements aim to gain information from quantum systems by minimizing disturbance. However, researchers Joshua Combes and Christopher Ferrie found a classical analogy for the same process, casting doubt on its quantum nature.
Uncovering the forbidden side of molecules
Scientists have successfully observed the 'forbidden' infrared spectrum of a charged molecule for the first time. This achievement enables precise measurements of molecular properties with unprecedented accuracy. The research has significant implications for the development of molecular clocks, quantum technology, and fundamental physics.
New insights into the world of quantum materials
Researchers have discovered a deformation of the Fermi surface in ultracold quantum gases due to anisotropic particle interactions. This deformation leads to an ellipsoidal shape, which is not spherical as predicted for isotropic interactions.
New technique uses fraction of measurements to efficiently find quantum wave functions
A new method, called compressive direct measurement, allows researchers to reconstruct a quantum state at 90 percent fidelity using only a quarter of the measurements required by previous methods. This technique speeds up the process and takes just 20 percent of the total measurements needed.
'Cavity protection effect' helps to conserve quantum information
Scientists have successfully used a protection effect to enhance the stability of a promising quantum system, allowing for longer storage times. This breakthrough opens up new applications for hybrid quantum systems and could lead to ultrafast quantum computers.
Spin diagnostics
Physicists at the Joint Quantum Institute have developed an MRI-like diagnostic technique for studying large ensembles of interacting quantum spins. The method reveals spin-spin interaction strengths and energies of various configurations, offering insights into complex phenomena like magnetism.
The quantum Cheshire cat
Researchers at Vienna University of Technology demonstrate a new quantum paradox where neutrons can be separated from their properties, allowing for more precise measurements. This 'Quantum Cheshire Cat' phenomenon shows that particles can exist in multiple states at once, making it ideal for applications requiring high precision.
Scientists separate a particle from its properties
Researchers successfully separated a neutron's magnetic moment from its particle, observing the first experimental evidence of the 'Cheshire Cat' paradox. This technique can be applied to any property of any quantum object, improving high precision measurements.
Measuring the smallest magnets
Physicists at Weizmann Institute of Science measure magnetic interaction between two single electrons by binding their spins in opposite directions. The measurements reveal that the electrons interact like regular bar magnets, with north poles repelling and rotating until they draw near.
Researchers find weird magic ingredient for quantum computing
A new study from the University of Waterloo's Institute for Quantum Computing reveals that contextuality is a necessary resource for achieving the advantages of quantum computation. Researchers have confirmed theoretically that contextuality is required for building a universal quantum computer.
New 'switch' could power quantum computing
Scientists at MIT and Harvard have developed a method to couple individual atoms with photons, enabling the creation of quantum switches that can transmit information. This technique allows for the scaling up of quantum computing processing available within small spaces.
'Ultracold' molecules promising for quantum computing, simulation
Scientists at Purdue University have successfully created a new type of ultracold molecule using lasers, which could enable quantum computing, precise sensors, and advanced simulations. The lithium-rubidium molecule has a significant dipole moment, enabling stronger interactions necessary for entanglement-based quantum computing.
Peeking into Schrodinger's box
Researchers at the University of Rochester have developed a new method called direct measurement that can characterize high-dimensional quantum states in a single experiment with no post-processing. This technique offers an exciting alternative to quantum tomography and could be central in developing high-security quantum communication...
Revisiting quantum effects in MEMS
Researchers found that quantum effects on MEMS operating conditions have been overestimated, affecting device stability. The study's results indicate changes in stability based on metal coatings and silicon doping levels.
Recent study reduces Casimir force to lowest recorded level
Researchers at IUPUI have achieved a drastically reduced measurement of the Casimir effect, a fundamental quantum phenomenon experienced between two neutral bodies in a vacuum. The study uses nanostructured metallic plates to suppress the force to a much lower rate than ever recorded previously.
Beyond quantum simulation: JILA physicists create 'crystal' of spin-swapping ultracold molecules
Researchers created a crystal-like arrangement of ultracold gas molecules that can swap quantum spin properties, potentially simulating or inventing exotic materials. The novel structure was achieved by manipulating the molecules' spins with microwave pulses, creating a 'superposition' of two opposite spins.
Temperature in the quantum world
Researchers at Vienna University of Technology study a large cloud of atoms and find that disorder spreads with a certain velocity, leading to the loss of quantum properties. As the disorder grows, a temperature emerges in the system, mirroring classical behavior.