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.
Quantum Measurement
Articles tagged with Quantum Measurement
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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.
Researchers propose new method for achieving nonlinear optical effects
A new method for achieving nonlinear optical effects has been proposed, enabling 'quantum gates' on demand for large-scale quantum circuits. The approach uses a sub-millimeter-diameter resonator to manipulate single photons and overcome the challenges of existing methods.
Getting around the Uncertainty Principle
Physicists at University of Rochester and University of Ottawa have made direct measurements of light's polarization states for the first time. This breakthrough overcomes key challenges to Heisenberg's Uncertainty Principle, enabling faster quantum information processing.
Playing quantum tricks with measurements
Researchers at the University of Innsbruck successfully reversed a quantum measurement using quantum error correction protocol, which contradicts foundational principles. This experiment demonstrates that information can be reconstructed from entangled states after individual particle measurements.
More certainty on uncertainty's quantum mechanical role
Researchers have made precise measurements without disturbing the system, providing direct experimental evidence that a new measurement-disturbance relationship is more accurate. This finding has significant implications for fields like quantum cryptography.
Light squeezed on a quantum scale
Griffith University researchers have developed a new technique for ultra-precise motion tracking using quantum-enhanced optical phase tracking. By combining
MIT News Release: 10-year-old problem in theoretical computer science falls
Researchers have developed multiprover interactive proofs that are resilient against entanglement, a breakthrough that has implications for cryptography and quantum physics. The findings provide insight into the complexity of computational problems and demonstrate the limitations of quantum information in cheating mechanisms.
Physicists identify new quantum state allowing 3 -- but not 2 -- atoms to stick together
Researchers at Kansas State University have identified a new bound state in atoms that can hold three identical atoms together, but repel two. This discovery sheds light on matter and its composition, and may lead to breakthroughs in experiments with ultracold atomic gases.
Quantum computers will be able to simulate particle collisions
Researchers have developed an algorithm that can simulate particle collisions on a quantum computer, a feat currently beyond conventional supercomputers. This breakthrough could enable quantum computers to tackle challenging problems like breaking complex codes and studying the early universe.
Elusive quasiparticles realized
Researchers have successfully realized and analyzed repulsive polarons, a new type of quasiparticle with modified properties. By controlling particle interactions, they found that these quasiparticles can exist for an almost ten times longer lifetime than previously thought.
NIST physicists benchmark quantum simulator with hundreds of qubits
The NIST simulator, built with 350 beryllium ions, has passed benchmarking tests and can study complex problems in material science that conventional computers cannot model. Scientists are now poised to explore high-temperature superconductors using the simulator's controlled quantum interactions.
$8.5 million research initiative will study best approaches for quantum memories
A five-year MURI project will investigate three physical platforms for designing matter-light interaction used to generate entangled photons. The team aims to create large-scale systems that use entanglement for quantum communication and computing.
Are you certain, Mr. Heisenberg?
Researchers at Vienna University of Technology distinguish different sources of quantum uncertainty, including fundamental uncertainty rooted in the particle itself. The study confirms the validity of Heisenberg's Uncertainty Principle while revealing a more nuanced understanding of quantum mechanics.
Atoms dressed with light show new interactions, could reveal way to observe enigmatic particle
Physicists at NIST have developed a method to manipulate atoms' internal states using lasers, revealing new interactions that could aid in designing materials for quantum computing. This technique allows researchers to simulate complicated systems and observe their behavior in slow motion.
Counting atoms with glass fiber
Scientists at Vienna University of Technology have developed a new method to detect single atoms using ultra-thin glass fibers, allowing for precise measurement of tiny amounts of substances. The technique enables the control of quantum states without destroying them.
Hints of universal behavior seen in exotic 3-atom states
Researchers have observed four cesium states with roughly the same size, surprising theorists and suggesting a new kind of ultracold chemistry at work. The three-body parameter varies consistently across different atomic species, implying universal behavior.
Optical circuit enables new approach to quantum technologies
Researchers have successfully demonstrated a quantum logic gate acting on four particles of light, enabling new approaches to quantum technologies. The device has the potential to improve secure communication and precision measurement, paving the way for more efficient computers and innovative applications.
Quantum hot potato: NIST researchers entice 2 atoms to swap smallest energy units
Physicists at NIST successfully coupled two beryllium ions, exchanging quanta and demonstrating linked motion. The technique has the potential to simplify information processing in future quantum computers and simulations.
Quantum quirk: JILA scientists pack atoms together to prevent collisions in atomic clock
JILA scientists have eliminated collisions between atoms in an atomic clock by packing them closer together. This approach improves the performance of experimental atomic clocks made of thousands or tens of thousands of neutral atoms.
Real-world graphene devices may have a bumpy ride
Researchers at NIST found that layering graphene on a substrate transforms its properties, creating hills and valleys that hinder electron mobility. The study uses a scanning tunneling microscope (STM) to investigate graphene's ideal properties in real-world conditions.