Quantum Superposition
Articles tagged with Quantum Superposition
Scientists at Stevens Institute of Technology reveal that time can go quantum in ion clock experiments
A team of physicists has discovered that atomic clocks can probe time in a way that reveals its quantum nature. By manipulating the vacuum itself, they created squeezed states that exhibit subtle quantum behavior, allowing a single clock to measure how it ticks both faster and slower simultaneously.
‘Giant superatoms’ unlock a new toolbox for quantum computers
Giant superatoms combine two quantum-mechanical constructs to suppress decoherence and create entanglement, opening opportunities for scalable and reliable quantum systems. This breakthrough enables quantum information to be protected, controlled, and distributed in new ways.
Quantum jam sessions teach quantum and jamming
Kobe University's new web application combines quantum game theory with jazz improvisation to explore creativity. Users can interact in a 'quantum jam session', receiving real-time visual and auditory feedback on their strategies.
Next-generation quantum communication
The researchers have successfully demonstrated a four-dimensional QKD system with high efficiency and low measurement error rates. This breakthrough enables secure data transmission over long distances, with potential applications in fields such as finance and government.
Gold clusters show promise as scalable options for quantum computers, sensors
Researchers at Penn State have demonstrated how gold nanoclusters can mimic the spin properties of trapped atomic ions, allowing for scalability in quantum applications. The clusters can be easily synthesized in large quantities and exhibit unique Rydberg-like spin-polarized states that mimic superpositions.
Magically reducing errors in quantum computers
Researchers from The University of Osaka develop a method to prepare high-fidelity 'magic states' for use in quantum computers with less overhead and unprecedented accuracy. This breakthrough aims to overcome the significant obstacle of noise in quantum systems, which can ruin computer setups.
New quantum navigation device uses atoms to measure acceleration in 3D
Physicists at the University of Colorado Boulder have developed a new type of atom interferometer that can measure acceleration in three dimensions. The device, which employs six lasers and artificial intelligence, has the potential to revolutionize navigation technology by providing accurate measurements in complex environments.
Hot Schrödinger cat states created
Scientists from University of Innsbruck successfully created hot Schrödinger cat states at temperatures up to 1.8 Kelvin, challenging the notion that high temperature destroys quantum effects. This breakthrough opens new opportunities for quantum technologies in warmer environments.
A quantum superhighway for ultrafast NOON states
Researchers at University of Liège have developed a method for rapidly creating NOON states with ultra-cold atoms, accelerating the process by a factor of 10,000 while maintaining high fidelity. This breakthrough opens up prospects in quantum metrology and quantum information technologies.
New ocelot chip makes strides in quantum computing
Researchers at AWS and Caltech developed a new cat qubit chip, called Ocelot, to suppress errors in quantum computers. The chip uses superconducting circuits to create stable qubits resistant to bit-flip errors.
Record cold quantum refrigerator paves way for reliable quantum computers
Researchers at Chalmers University of Technology and University of Maryland have engineered a new type of refrigerator that can autonomously cool superconducting qubits to record-low temperatures. This breakthrough paves the way for more reliable and error-free quantum computations.
One-dimensional perovskite lattice tilts & stretches to stabilize excitons
Researchers demonstrated the existence of an Exciton-Polaron in a quasi-one-dimensional hybrid perovskitoid, showcasing its potential for optoelectronic applications. The study reveals that the one-dimensional lattice is soft and susceptible to reorganization, enabling tunable frameworks for new quantum technologies.
Novel quantum materials in the spotlight
German physicist Christian Schneider has been awarded a European Research Council Consolidator Grant to study the optical properties of two-dimensional materials. His team plans to develop experimental set-ups to investigate the unique properties of these materials, which could lead to new applications in quantum technologies.
Long-lived Schrödinger-cat state achieves Heisenberg-limited sensitivity
Scientists have successfully created a Schrödinger-cat state with a minute-scale lifetime, significantly enhancing quantum metrology measurement sensitivity. The long-lived state exhibits enhanced magnetic field sensitivity and is immune to intensity noise and spatial variations of the optical lattice.
How fast is quantum entanglement?
Researchers at TU Wien have developed computer simulations to investigate the temporal development of quantum entanglement. They found that the 'birth time' of an electron flying away from an atom is related to the state of the remaining electron, demonstrating a quantum-physical superposition.
X-rays from atomic systems could reveal new clues about rival quantum theories
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.
Neutrons on classically inexplicable paths
Researchers used neutron beams to test the Leggett-Garg inequality, a formula that challenges macroscopic realism. The results show that classical explanations are not possible, confirming quantum theory's strange properties.
Breakthrough may clear major hurdle for quantum computers
Researchers at Chalmers University of Technology have created a unique system that combats the trade-off problem between operation complexity and fault tolerance. The system uses harmonic oscillators to encode information linearly, offering a seamless gradient of colors and providing far richer possibilities than traditional qubits.
New super-pure silicon chip opens path to powerful quantum computers
Researchers at the University of Melbourne and Manchester have invented a breakthrough technique for manufacturing highly purified silicon, making it ideal for creating powerful quantum computers. The new technique uses qubits of phosphorous atoms implanted into crystals of pure stable silicon, extending the duration of notoriously fra...
100 kilometers of quantum-encrypted transfer
Scientists have made significant breakthroughs in Quantum Key Distribution (QKD) technology, enabling secure data transfer over long distances. The new method uses Continuous Variable Quantum Key Distribution to distribute quantum-encrypted keys via fibre optic cables, paving the way for a quantum-secure internet infrastructure.
PPPL unveils new laboratory space to advance quantum information science
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.
Researchers’ approach may protect quantum computers from attacks
Researchers developed an approach called Quantum Noise Injection for Adversarial Defense (QNAD) to protect quantum computers from attacks. The method introduces noise into the quantum neural network, making it more accurate during an attack.
A physical qubit with built-in error correction
A team of researchers from the universities of Mainz, Olomouc, and Tokyo has successfully generated a logical qubit from a single light pulse that can correct errors. This breakthrough uses a photon-based approach to overcome the limitations of current quantum computing technology.
Lights, detector, action!
Researchers at Kyoto University have developed a novel method for quantum infrared spectroscopy, generating a wider range of infrared photons with improved sensitivity. This breakthrough enables compact, high-performance scanners for various applications in environmental monitoring, medicine, and security.
Observing macroscopic quantum effects in the dark
Researchers from the University of Innsbruck propose an experiment to observe macroscopic quantum effects in a dark potential created by electrostatic or magnetic forces. By letting a cooled nanoscale glass sphere evolve in this non-optical environment, they aim to rapidly generate a macroscopic quantum superposition state.
New theory unites Einstein’s gravity with quantum mechanics
A new theory unifies gravity and quantum mechanics by preserving Einstein's classical concept of spacetime, proposing random fluctuations in spacetime that can be verified experimentally. The theory challenges the pursuit of a quantum theory of gravity, offering an alternative approach to reconcile the two fundamental theories.
Do measurements produce the reality they show us?
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.
A new type of quantum bit in semiconductor nanostructures
A German-Chinese research team has successfully created a quantum bit in a semiconductor nanostructure by exciting a superposition state with two short-wavelength optical laser pulses. This achievement demonstrates coherent control of a high-orbital hole in a semiconductor quantum dot.
Schrödinger’s cat makes better qubits
Researchers have developed a novel encoding scheme called critical Schrödinger cat code, which could revolutionize the reliability of quantum computers. This technique uses a hybrid regime to operate close to the critical point of a phase transition, resulting in enhanced error suppression capabilities.
When the light is neither "on" nor "off" in the nanoworld
Researchers from Würzburg and Bielefeld successfully detect exotic states of quantum physics in a nanostructure, where light can exist as both on and off at the same time. This breakthrough enables the development of novel optical quantum technologies for future computer chips.
Can you trust your quantum simulator?
Physicists at MIT and Caltech developed a new benchmarking protocol to characterize the fidelity of quantum analog simulators, enabling high precision characterization. The protocol analyzes random fluctuations in atomic-scale systems, revealing universal patterns that can be used to gauge the accuracy of these devices.
Dawn of solid-state quantum networks
Researchers demonstrated high-visibility quantum interference between two independent semiconductor quantum dots, an important step toward scalable quantum networks. The observed interference visibility is up to 93%, paving the way for solid-state quantum networks with distances over 300 km.
Microlaser chip adds new dimensions to quantum communication
Researchers at Penn Engineering have created a chip that outstrips existing quantum communications hardware, communicating in qudits and doubling the quantum information space. The technology enables significant advances in quantum cryptography, raising the maximum secure key rate for information exchange.
Uncovering the massive quantum mysteries of black holes
Researchers at the University of Queensland have confirmed black hole quantum properties, including superposition and wildly different masses simultaneously. The study reinforces early theories by Jacob Bekenstein, postulating that black holes can only have specific mass values within certain bands or ratios.
A perfect trap for light
Researchers from TU Wien and Hebrew University develop 'light trap' that allows complete absorption of light in thin layers using mirrors and lenses. The system works by steering the light beam into a circle and then superimposing it on itself, blocking any escape.
Master equation to boost quantum technologies
Physicists have developed a 'master equation' to understand feedback control at the quantum level, enabling precise real-time control over quantum systems. This breakthrough has the potential to revolutionize quantum technologies by exploiting quantum effects and mitigating fragile system properties.
Quantum control for advanced technology: Past and present
A new review paper assesses recent progress in controlling quantum systems and applies it to emerging technologies, highlighting the need for a unified theoretical framework. The authors identify roadblocks that must be overcome to manifest a future quantum technological landscape.
A roadmap for the future of quantum simulation
The paper explores near- and medium-term possibilities for quantum simulation on analogue and digital platforms to evaluate its potential. Quantum simulation has promising applications in materials science, high-energy physics, and quantum chemistry.
A quantum wave in two crystals
A team of scientists has successfully built a neutron interferometer using two separate crystals, a major breakthrough in quantum physics. This achievement opens up new possibilities for quantum measurements and research on quantum effects in a gravitational field.
Dynamic ring resonator offers new opportunity in synthetic frequency dimension
Researchers constructed a synthetic stub lattice in two coupled rings of different lengths, observing flat bands, band transitions and mode localization. This experimental demonstration enables dynamic control of light and may pave the way for future applications in optical communications.
Rice lab’s quantum simulator delivers new insight
Physicists at Rice University have created a quantum simulator that reveals the behavior of electrons in one-dimensional wires, shedding light on spin-charge separation. The study's findings have implications for quantum computing and electronics with atom-scale wires.
One particle on two paths: Quantum physics is right
Researchers at TU Wien and Hiroshima University have corrected a long-standing flaw in the double-slit experiment, proving that individual particles can move along multiple paths at once. By detecting a single neutron, they were able to determine its presence on each path with high accuracy.
A ‘beyond-quantum’ equivalence principle for superposition and entanglement
Researchers discovered a novel connection between superposition and entanglement that goes beyond quantum theory, applicable to more exotic theories. This equivalence has practical implications for ultra-secure encryption, including popular protocols like BB84.
Henry Yuen wins NSF CAREER Award
Assistant Professor Henry Yuen at Columbia University will receive a $675,000 grant to develop verification protocols for entanglement theory and explore broader mathematical applications. His work aims to solve fundamental problems in computer science, mathematics, and physics using quantum entanglement.
Artificial neurons go quantum with photonic circuits
Researchers at the University of Vienna have created a quantum memristor that combines artificial intelligence and quantum computing. The device uses single photons to achieve memristive behavior, which can be used for learning on both classical and quantum tasks.
New world record for qubit storage
A UNIGE team has successfully stored a quantum bit for 20 milliseconds in a crystal-based memory. This achievement marks a major step towards the development of long-distance quantum telecommunications networks.
Chaining atoms together yields quantum storage
Researchers at Caltech developed a novel approach for quantum storage using nuclear spins, which can effectively chain up several atoms to store information. The system utilizes ytterbium ions and surrounding vanadium atoms to create a reliable quantum memory.
Scientists visualize electron crystals in a quantum superposition
Researchers use scanning tunneling microscopes to visualize electrons in graphene, discovering crystal structures that exhibit spatial periodicity corresponding to quantum superposition. These findings shed light on the complex quantum phases electrons can form due to their interactions.
Super fast quantum battery
Researchers have developed a quantum battery with a counter-intuitive property where recharge time decreases with increasing battery capacity. This leads to a hyper-fast charge that can be applied in various scientific and technological fields such as wireless chargers, solar cells, and cameras.
Optical cavities could be key to next generation interferometers
Researchers propose a method using optical cavities to enhance atom interferometers, enabling extreme momentum transfer for detecting dark matter and gravitational waves. This could facilitate breakthroughs in fundamental physics and future applications.
To capture single photons, researchers create an interference ‘wall’
Theorists at the University of Chicago have developed a new scheme for trapping single photons in a cavity, creating a 'wall' that prevents further photons from entering. This mechanism allows two sources to emit selected photons into a cavity before destructive interference cancels them out.
In quantum mechanics, not even time flows as you might expect it to
A team of physicists discovered that quantum systems can exhibit superposition of forward and backward time flows, leading to complex laws governing time flow. In certain cases with small entropy, observing the consequences of a system's evolution along both temporal directions becomes physically possible.
Newly improved quantum algorithm performs full configuration interaction calculations without controlled time evolutions
Researchers at Osaka City University developed a new quantum algorithm that calculates potential energy curves of molecules without controlled time evolutions. This addresses issues with conventional quantum phase estimation algorithms, enabling parallel processing and efficient full-CI calculations.
In the quantum realm, not even time flows as you might expect
A new study shows that quantum systems can exist in a superposition of forward and backward time flows, blurring the traditional concept of time. This phenomenon has practical implications for quantum thermodynamics, potentially offering advantages in thermal machines and refrigerators.
Machine learning a useful tool for quantum control, finds new study
Researchers used reinforcement learning to control a small particle moving in a double-well system, achieving accurate control despite noisy measurements. The method shows promise for future applications in quantum technologies and AI.
Fundamental quantum theorem now holds for finite temperatures and not just absolute zero
Researchers at Skoltech extend the adiabatic theorem to finite temperatures, ensuring more stable quantum dynamics. The findings have significant implications for next-generation quantum devices and computing.
Russian physicists mix classical light with half a photon on a qubit
A Russian-U.K. research team has proposed a theoretical description for the new effect of quantum wave mixing involving classical and nonclassical states of microwave radiation. The study builds on earlier experiments on artificial atoms, which serve as qubits for quantum computers and probes fundamental laws of nature.
Astonishing quantum experiment in Science raises questions
A new experiment demonstrates the stability of quantum interactions between coupled atoms under electron bombardment. The findings suggest that special quantum states may be realized in quantum computers more easily than previously thought.
Scientists overhear two atoms chatting
Researchers at Delft University of Technology intercept a chat between two atoms, demonstrating perfect superposition and entangled quantum states. This breakthrough has significant implications for research on quantum bits and may lead to new experimental possibilities.