Experiment records extreme quantum weirdness
Researchers have achieved the most extreme entanglement between photon pairs, pushing quantum physics to its limit. The result bolsters confidence in schemes for quantum cryptography and computing.
Quantum Entanglement
Articles tagged with Quantum Entanglement
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It's a beauty: JILA's quantum crystal is now more valuable
Physicists at JILA have created a denser quantum crystal by packing about five times more molecules into it, allowing for the study of correlations among molecule spins and entanglement. The crystal's high density enables scientists to investigate complex effects that may lead to new materials for electronics.
Entering the strange world of ultra-cold chemistry
Scientists are exploring the formation of novel molecular aggregates at ultra-cold temperatures, where quantum mechanical principles govern interactions between atoms and molecules. By studying synthetic solids created by optical lattices, researchers aim to develop a new theory describing the chemistry of ultra-cold atoms.
Physicists mimic quantum entanglement with laser pointer to double data speeds
Researchers successfully mimic quantum entanglement using a laser pointer, doubling data speed in laser communication. The team demonstrated nonseparability of the laser beam's shape and polarization, enabling encoding of two bits of information.
Historic Delft Experiments tests Einstein's 'God does not play dice' using quantum 'dice' made in Barcelona
The Delft experiment disproves Einstein's local realism principle by entangling electrons across 1.3 km, measuring their orientations individually and agreeing well. The rapid random number generation used in the experiment closes a loophole, proving that God may indeed play 'dice' with the universe
Prestigious fellowship for Strathclyde physics researcher
Dr Jonathan Pritchard has secured a prestigious fellowship to support his research into the direct exploitation of quantum phenomena. His project aims to develop a hybrid device combining atoms and superconducting circuits for scalable quantum networking, with potential applications in computing, finance, and more.
A twist for control of orbital angular momentum of neutron waves
Researchers at University of Waterloo's Institute for Quantum Computing have controlled the orbital angular momentum of neutron waves for the first time. This breakthrough enables probing of material properties like magnetism and crystalline structure, opening doors to deeper studies of superconducting and chiral materials.
A new study predicts a quantum Goldilocks effect
A new study suggests that the universe was 'cooked' at just the right speeds to generate a rich and complex structure. The findings contradict the widespread belief that faster quantum phase transitions generate more structure.
Drawing a line between quantum and classical world
Researchers at University of Rochester find that a classical beam of light can fail Bell's Inequality test if entangled, suggesting that the boundary between quantum and classical worlds is not as clear-cut as thought. The study reveals that some features of the real world require entanglement, a key ingredient of quantum physics.
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.
Producing spin-entangled electrons
Researchers have produced pairs of spin-entangled electrons, demonstrating their ability to remain entangled even when separated on a chip. This achievement could contribute to the development of futuristic quantum networks operating using quantum teleportation.
New method of quantum entanglement packs vastly more data in a photon
Researchers at UCLA have developed a new way to harness light particles, enabling photons to be entangled in multiple dimensions. This allows for the transmission of denser packets of information through fiber optic networks, with potential applications in finance, healthcare, and military communications.
Visualizing the 'matrix'
A team developed a graphical representation of nuclear spin matrices for coupled spins in arbitrary quantum states, enabling better control and utilization of quantum phenomena. The 'SpinDrops' app provides intuitive access to the fascinating world of quantum control theory.
Entangled photons unlock new super-sensitive characterisation of quantum technology
Scientists have developed a new protocol to estimate unknown optical processes with enhanced precision using entangled photons, promising better sensors for medical research and more powerful quantum computers. The technique uses the unique properties of quantum mechanics to surpass current limitations in sensing and measurement.
Seeing a single photon, new exoplanet search, quantum space network at 2015 DAMOP Meeting
Researchers will present novel optical systems for detecting exoplanets and measuring the Sun's internal structure. A device called a laser frequency comb will also detect minute changes in light from the sun, enabling the detection of Earth-like planets around distant stars.
Donuts, math, and superdense teleportation of quantum information
A new protocol reduces resources and effort required to teleport quantum information, improving reliability with 88% transmission fidelity. The method uses hyperentangled photons and a torus shape to encode and transmit information efficiently.
How spacetime is built by quantum entanglement
Physicists at University of Tokyo unify general relativity and quantum mechanics by showing how spacetime emerges from quantum entanglement. Quantum entanglement generates extra dimensions of gravitational theory, shedding light on the microscopic structure of spacetime.
An efficient approach to concentrate arbitrary N-particle W state
Researchers developed an efficient method to concentrate arbitrary N-particle less-entangled W states into maximally entangled states using parity-check gates. The approach requires a single photon as an auxiliary and can be repeated to increase success probability.
Squeezed quantum cats
Scientists have created a hybrid state of being both 'alive' and 'dead' by combining Schrödinger's cat with squeezed quantum states, enabling more stable quantum computing and precise measurement capabilities.
Is the universe a hologram?
Researchers at TU Wien found that the holographic principle can hold true even in flat spacetime, confirming its validity in our own universe. This validation suggests that the universe may be a hologram, with three-dimensional space being an image of two-dimensional processes on a cosmic horizon.
Quantum cryptography at the speed of light: Researchers design first all-photonic repeaters
Engineers at the University of Toronto have developed the first all-photonic quantum repeaters, enabling reliable and secure data transmission over long distances. The repeaters use highly entangled quantum states to reduce losses and function at room temperature.
Frustrated magnets -- new experiment reveals clues to their discontent
Researchers observed the Hall Effect in frustrated magnets at extremely low temperatures, challenging previous theories. The discovery may pave the way for new electronics and innovations in computing.
Quantum teleportation on a chip
Researchers at the University of Bristol have successfully integrated quantum teleportation circuits onto a photonic chip, overcoming scalability limitations. This breakthrough enables the development of ultra-high-speed quantum computers and strengthens communication security.
A first glimpse inside a macroscopic quantum state
Researchers have directly and experimentally confirmed the link between macroscopic quantum states and entangled particles. The study uses a beam of squeezed light to demonstrate entanglement among individual photon pairs, paving the way for advances in superconductivity, optical communications, and quantum computing.
Thousands of atoms entangled with a single photon
Researchers at MIT have developed a technique to entangle 3,000 atoms using a single photon, promising improved accuracy in atomic clocks. This breakthrough could lead to more precise timekeeping and potentially overcome the standard quantum limit.
Bar-Ilan U. researchers identify 'tipping point' between quantum and classical worlds
The study observes the convergence of classical and quantum behavior in photons, revealing a 'point of transition' where quantum nature 'collapses' to conform to classical rules. The researchers also detect bi-photons at an unprecedented high rate using a fiber-based nonlinear process.
Quantum experiment verifies Einstein's 'spooky action at a distance'
A quantum experiment has demonstrated Einstein's concept of 'spooky action at a distance' using homodyne measurements on a single particle. The phenomenon shows the non-local collapse of a particle's wave function when detected in two or more places.
Quantum cause and effect
Researchers at Perimeter Institute and IQC have discovered a new class of quantum advantages that allow for cause-effect correlation determination without intervention. This breakthrough has significance for both quantum information and quantum foundations, underpinning the promise of quantum technologies.
Quantum correlation can imply causation
Research from the University of Waterloo and Perimeter Institute demonstrates that quantum mechanics can distinguish between cause-effect relations and common causes, unlike classical physics. This breakthrough enables a new approach to causal inference, potentially solving long-standing problems in science.
Nanospheres cooled with light to explore the limits of quantum physics
Researchers at UCL develop technology to suspend and cool glass particles to absolute zero, enabling the creation of quantum states in objects far larger than atoms. This could lead to breakthroughs in motion sensors and quantum computer networks.
Data structures influence speed of quantum search in unexpected ways
A new analysis found that highly connected databases don't always support fastest quantum computing, with low connectivity yielding fast search in some cases. Researchers used the properties of superposition to model a quantum particle's movement through a database, demonstrating the unexpected influence of data structure on search speed.
Quantum sensor's advantages survive entanglement breakdown
Researchers at MIT demonstrate that quantum sensors can outperform classical systems even when entanglement breaks down due to environmental influences. The study shows that correlations between entangled beams remain strong enough to improve signal-to-noise ratio, leading to increased sensitivity.
New research signals big future for quantum radar
Researchers have developed a hybrid quantum radar system that uses microwave-optical entanglement to detect cancer cells and stealth aircraft. The device operates at lower energies than conventional systems, enabling long-term potential for non-invasive medical applications such as NMR scans.
Correlations of quantum particles help in distinguishing physical processes
Researchers at University of Strathclyde and Waterloo discovered a method to quantify steering's impact on distinguishing physical processes, enhancing quantum information processing. The study has implications for quantum cryptography and metrology.
Quantum computer as detector shows space is not squeezed
Physicists use entangled ions to test the isotropy of space, disproving anisotropy theories. The experiment shows space is isotropic to one part in a billion billion, improving upon previous experiments.
Entanglement on a chip: Breakthrough promises secure communications and faster computers
Researchers have developed a microscopic component that generates continuous entangled photons, enabling faster computing and secure communication. The new design is based on silicon technology and is incredibly small and efficient.
Improved interface for a quantum internet
Physicists at the University of Innsbruck have improved an interface for a quantum internet by harnessing superradiant states, which enhance the creation of single photons. This breakthrough enables faster information transfer and more robust storage, paving the way for future quantum computing applications.
Toward quantum chips
Researchers have built an array of light detectors sensitive enough to register individual photons and mounted them on a silicon optical chip. The approach increases detector density and sensitivity, yielding results up to 20 percent, which is a significant step toward practical quantum computing.
Quantum optical hard drive breakthrough
A team of physicists at Australian National University has improved storage time by a factor of over 100, achieving a record six-hour storage time. This breakthrough is expected to revolutionize the transmission of quantum information and enable the creation of a secure worldwide data encryption network.
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.
Researchers generate tunable photon-pair spectrum using room-temperature quantum optics silicon chip
A team of researchers at the University of California, San Diego, has developed a silicon chip that can emit and control quantum light at room temperature. The device uses Spontaneous Optical Nonlinear Mixing to generate entangled photon pairs, which can be tuned over a wide range of Schmidt numbers for specific quantum optic properties.
Electron pairs on demand
Researchers from Leibniz University Hannover and PTB have successfully demonstrated the on-demand emission of electron pairs from a semiconductor quantum dot. The resulting electron pairs were found to be spatially separated with over 90% efficiency, a crucial step towards future applications such as quantum computing and cryptography.
Twisted light waves sent across Vienna
Researchers sent twisted light beams across Vienna, encoding images and demonstrating increased data-carrying capacity. The technology could significantly increase data-rates in classical communication and make secret keys tougher to crack in quantum communication.
The Peres conjecture is false!
A team of researchers from Université de Genève and Hungarian Academy of Sciences disproves Asher Peres's conjecture that the weakest form of quantum entanglement can never result in the strongest manifestation of nonlocality. They find a counter-example using numerical algorithms, showing bound entanglement can violate Bell's inequality.
A new approach to on-chip quantum computing
Researchers develop new approach to generate mixed-up photon pairs on a chip, exploiting micro-ring resonator technology. The device can directly generate orthogonal polarized photons at very low power, suitable for quantum protocols.
Entanglement made tangible
Researchers at EPFL propose a feasible experiment to show entanglement in the macroscopic realm, leveraging optomechanics and nanostructures. The experiment involves converting light into mechanical vibrations, which exhibit entangled behavior.
From light into matter, nothing seems to stop quantum teleportation
Researchers at Université de Genève have successfully teleported the quantum state of a photon to a crystal over 25 kilometers of optical fibre, surpassing their previous record of 6 kilometers. This experiment demonstrates that quantum state can exist independently of material composition.
Three's a charm: NIST detectors reveal entangled photon triplets
Researchers at NIST and the University of Waterloo directly entangled three photons, a breakthrough in quantum information systems. The use of superfast single-photon detectors enabled stable and high-quality results, paving the way for applications in quantum computing and quantum communications.
Duality principle is 'safe and sound'
A team led by Robert Boyd at the University of Rochester replicated a 2012 experiment that appeared to violate a fundamental law of quantum mechanics. By analyzing the data more subtly, they found that biased sampling was the cause of the anomaly, reaffirming the standard interpretation of quantum laws.
NIST ion duet offers tunable module for quantum simulator
Physicists at NIST demonstrated a pas de deux of atomic ions that combines precise control with entangled states. The ion duet enables scalable simulation and computing, with potential applications in logic operations and precision measurement tools.
Watching Schrödinger's cat die (or come to life)
Physicists at UC Berkeley have demonstrated a way to follow the 'life history' of a quantum system, allowing for continuous error correction. This technology could enable steering quantum evolution and optimizing chemical reactions.
Unleashing the power of quantum dot triplets
Researchers have discovered a way to control quantum dot triplets using electrical impulses, which could lead to faster quantum computers. The study shows that changing the coupling of three coherently coupled quantum dots can induce a phase transition between entangled and disentangled electron states.
Scientists find way to maintain quantum entanglement in amplified signals
Physicists Sergei Filippov and Mario Ziman have found a way to preserve quantum entanglement in particles passing through an amplifier and when transmitting signals over long distances. This breakthrough allows for more efficient quantum computing and secure communication channels.
New paths into the world of quasiparticles
Researchers at the University of Innsbruck have developed a platform to investigate quasiparticles and entanglement propagation in quantum many-body systems. They can precisely initialize, control, and measure the states and properties of quasiparticle excitations.
Physicists find way to boot up quantum computers 72 times faster than previously possible
Researchers at Saarland University developed a new calibration technique called Ad-HOC that reduces the calibration error rate to below 0.1% and speeds up the process from six hours to five minutes.
Experimentally testing nonlocality in many-body systems
Researchers at ICFO have designed classes of multipartite Bell inequalities to detect nonlocality in many-body quantum states. These inequalities can be verified experimentally by measuring total spin components, enabling the study of complex many-body systems.
Quantum computation: Fragile yet error-free
Physicists in Innsbruck developed a new quantum error-correcting method and tested it experimentally. The topological code arranges qubits on a two-dimensional lattice to detect and correct general errors. This approach could lead to a robust quantum computer performing any number of operations without being impeded by errors.
Viewing deeper into the quantum world
Researchers at ICFO have demonstrated a nonlinear interferometer that can measure tiny magnetization with improved sensitivity. This breakthrough confirms theoretical predictions and paves the way for more accurate quantum measurements.
University of Toronto physicists take quantum leap toward ultra-precise measurement
Physicists at the University of Toronto have made a breakthrough in ultra-precise measurement technologies using quantum mechanics. By employing entangled photons and multiple detectors, they were able to achieve resolutions unattainable by classical physics.
Pitt team first to detect exciton in metal
Researchers at the University of Pittsburgh have detected a fundamental particle of light-matter interaction in metals, known as an exciton. The discovery provides a microscopic quantum mechanical description of how light excites electrons in metals.