Quantum Entanglement Could Link Distant Telescopes for Sharper Images
Researchers from the University of Arizona, University of Maryland and NASA have proposed a quantum‑entanglement‑based long‑baseline interferometry method that eliminates the need for fragile optical links between distant telescopes. By sharing pre‑distributed entangled qubits and using spatial‑mode sorters at each site, the system can perform differential phase measurements remotely and reach the quantum Fisher information limit. Simulations show sub‑Rayleigh resolution for weak stellar sources, and the approach scales to larger telescope networks. The work builds on earlier theoretical proposals and recent entanglement‑teleportation experiments.
Triplet Superconductivity—Physicists May Have Found the Missing Link for Quantum Computers
Physicists led by Jacob Linder at Norway’s NTNU claim to have observed intrinsic triplet superconductivity in a niobium‑rhenium (NbRe) alloy. The discovery, published in Physical Review Letters, suggests NbRe can carry spin‑polarized Cooper pairs without resistance, a property absent in...
Quantum Simulator Reveals Statistical Localization that Keeps Most Qubit States Frozen
Researchers at Duke University used a neutral‑atom Rydberg quantum simulator to observe statistical localization, a phenomenon where most qubit configurations remain frozen despite quantum evolution. The effect, first theorized in 2020, was demonstrated in a one‑dimensional chain of rubidium atoms...
Simplifying Quantum Simulations—Symmetry Can Cut Computational Effort by Several Orders of Magnitude
Physicists Guido Burkard and Joris Kattemölle introduced a symmetry‑based method that slashes the computational effort of quantum simulations by over a thousandfold. By treating repeating lattice patterns as single tiles, the approach replaces thousands of point‑by‑point mappings with a few...
Microscopic Mirrors for Future Quantum Networks: A New Way to Make High-Performance Optical Resonators
Harvard SEAS researchers have introduced a micro‑fabrication technique that creates some of the smallest, smoothest mirrors ever made for photon control. By thermally oxidizing silicon, stripping the oxide, and applying a stress‑engineered dielectric stack, the film buckles into a precisely...
Measuring Chaos: Researchers Quantify the Quantum Butterfly Effect
Chinese researchers led by Yu‑Chen Li have, for the first time, precisely quantified the exponential growth of chaos in a quantum many‑body system during a time‑reversal protocol. Using solid‑state nuclear magnetic resonance, they measured out‑of‑time‑ordered correlators (OTOCs) and applied a...
New Amplifier Design Promises Less Noise, More Gain for Quantum Computers
RIKEN researchers have unveiled a new Josephson traveling‑wave parametric amplifier (JTWPA) that cuts added noise to 0.68 quanta, just 0.18 above the quantum limit, while delivering high gain. The device replaces lossy dielectric with a spiraled, fish‑bone‑like tapered waveguide, simplifying...
Silicon Quantum Processor Detects Single-Qubit Errors While Preserving Entanglement
Researchers have demonstrated a silicon‑based quantum processor that can detect single‑qubit errors while preserving entanglement across a five‑qubit register. Real‑time parity‑check circuits flag deviations with 99 % detection fidelity, and entanglement fidelity stays above 95 % after each detection cycle. The non‑destructive...
Optical Switch Protocol Verifies Entangled Quantum States in Real Time without Destroying Them
Researchers at the University of Vienna have unveiled an optical‑switch protocol that can certify entangled quantum states in real time without destroying them. Traditional quantum state tomography requires repeated destructive measurements, making verification slow and resource‑intensive. The new method routes...
Using Light to Probe Fractional Charges in a Fractional Chern Insulator
Researchers from the University of Washington, NIMS Japan, and ETH Zurich have experimentally detected a new quasiparticle—anyon‑trions—in twisted bilayer MoTe₂, confirming fractional charge excitations in a fractional Chern insulator (FCI). By tuning electron density and employing photoluminescence spectroscopy, they observed...
Quantum Research in Two Ways: From Proving Someone's Location to Simulating Financial Markets
Two Leiden University Ph.D. candidates are defending theses that showcase concrete quantum applications. Kirsten Kanneworff’s work advances quantum position verification by using single‑photon signals to prove a user’s location with tamper‑proof timing. David Dechant explores how noisy quantum computers, simulated...
Time Crystals Could Become Accurate and Efficient Timekeepers
A new mathematical analysis published in Physical Review Letters demonstrates that time‑crystal systems could serve as ultra‑precise quantum clocks, outperforming conventional designs that rely on continuous laser excitation. By exploiting self‑sustaining oscillations, these exotic phases maintain timing accuracy even at...
Cutting Down on Quantum-Dot Crosstalk: Precise Measurements Expose a New Challenge
RIKEN researchers have experimentally quantified charge‑induced energy shifts caused by neighboring quantum dots in silicon spin qubits. The study shows that micromagnets, while improving control, amplify crosstalk that can significantly increase qubit error rates. Direct measurements reveal the magnitude of...
Physicists Develop New Protocol for Building Photonic Graph States
Physicists at the University of Illinois Urbana‑Champaign have introduced an “emit‑then‑add” protocol that creates photonic graph states by heralding each photon before it is added to a virtual graph. The scheme converts the dominant loss problem into a coherence requirement...
Rolling Out the Carpet for Spin Qubits with New Chip Architecture
QuTech researchers unveiled QARPET, a tiled cross‑bar chip that can host up to 1,058 hole‑spin qubits on a 23 × 23 array while using only 53 control lines. The architecture packs two spin qubits and a charge sensor into each repeatable tile,...
Majorana Qubits Become Readable as Quantum Capacitance Detects Even-Odd States
An international team has demonstrated the first direct readout of Majorana qubits using quantum capacitance. By assembling a modular minimal Kitaev chain from two semiconductor quantum dots coupled through a superconductor, they measured the even‑odd parity of the non‑local Majorana...
Current Flows without Heat Loss in Newly Engineered Fractional Quantum Material
Researchers at the University of Washington have demonstrated a dissipationless fractional Chern insulator, enabling current to flow along fractional edge states without heat loss. By employing horizontal flux crystal growth and refined twist-angle control, carrier mobility improved over tenfold, eliminating...
Machine Learning Reveals Hidden Landscape of Robust Information Storage
A team of physicists used neural cellular automata—a machine‑learning representation of local update rules—to uncover dozens of new two‑dimensional many‑body memory mechanisms that go beyond the classic Toom’s rule. In 1,000 training runs, 37 distinct cellular‑automaton rules emerged that preserve...
Laser‑written Glass Chip Pushes Quantum Communication Toward Practical Deployment
Researchers at the University of Padua and partners have fabricated a high‑performance quantum coherent receiver directly inside borosilicate glass using femtosecond laser writing. The glass chip delivers ultra‑low insertion loss (~1 dB), polarization‑independent operation, and a 73 dB common‑mode rejection ratio, outperforming...
Quantum Encryption Method Demonstrated at City-Sized Distances for the First Time
Researchers in China have demonstrated device‑independent quantum key distribution (DI‑QKD) across 100 km of optical fiber, marking the first city‑scale implementation. By leveraging single‑photon interference and quantum frequency conversion, the team achieved high‑fidelity atom‑atom entanglement and maintained CHSH Bell inequality violations...
Three-Way Quantum Correlations Fade Exponentially with Distance at Any Temperature, Study Shows
A RIKEN researcher has mathematically proven that genuine three‑way quantum correlations vanish exponentially with distance in any thermal equilibrium state, regardless of temperature. The proof relies on conditional mutual information to quantify correlation strength and shows that distant regions become...
Study Reveals Microscopic Origins of Surface Noise Limiting Diamond Quantum Sensors
A new theoretical study from the University of Chicago and Argonne National Laboratory pinpoints the microscopic mechanisms that cause surface‑related noise to degrade the quantum coherence of shallow nitrogen‑vacancy (NV) centers in diamond. By coupling density‑functional‑theory surface models with quantum...
Tuning Topological Superconductors Into Existence by Adjusting the Ratio of Two Elements
Researchers at the University of Chicago and West Virginia University demonstrated that thin‑film iron telluride selenide can be transformed into a topological superconductor by precisely adjusting the tellurium‑to‑selenium ratio. The study, published in Nature Communications, shows that changing this ratio...
Electron-Phonon 'Surfing' Could Help Stabilize Quantum Hardware, Nanowire Tests Suggest
UCLA researchers discovered that electrons can "surf" phonon waves in quasi‑one‑dimensional nanowires, causing flicker noise to drop as current rises. The effect was demonstrated in tantalum‑based and niobium‑based nanowires, with noise falling below measurable limits even at room temperature. This...
Ultra-Thin Metasurface Can Generate and Direct Quantum Entanglement
Researchers at Nanjing University and the University of Science and Technology of China have demonstrated an ultra‑thin metasurface that both creates and routes polarization‑entangled photon pairs. The nanostructured silicon‑pillar array converts two orthogonal photons into Bell‑state entanglement across multiple output...
Niobium's Superconducting Switch Cuts Near-Field Radiative Heat Transfer 20-Fold
University of Michigan engineers have demonstrated that a thin niobium film, when cooled below its superconducting transition at 7.4 K, suppresses near‑field radiative heat transfer by a factor of 20 compared with its normal metallic state. The team built a scanning...
Using Duality to Construct and Classify New Quantum Phases
A multinational team led by Weiguang Cao, Masahito Yamazaki and Linhao Li used duality transformations to map non‑invertible symmetry‑protected topological (SPT) phases onto familiar spontaneously broken symmetry (SSB) phases. This mapping allowed them to classify non‑invertible SPT phases in arbitrary...
91-Qubit Processor Accurately Simulates Many-Body Quantum Chaos
A team using a 91‑qubit superconducting quantum processor has accurately simulated many‑body quantum chaos. They employed dual‑unitary circuits to model a kicked Ising system and applied tensor‑network error mitigation (TEM) to correct noise in post‑processing. The error‑mitigated results closely follow...
Collaboration of Elementary Particles: How Teamwork Among Photon Pairs Overcomes Quantum Errors
Researchers at the University of Rostock have demonstrated that encoding information in pairs of photons—rather than single photons—dramatically reduces quantum‑error rates. Using a high‑power laser‑written waveguide chip, they showed that photon‑pair holonomies remain stable even when device parameters shift by...
AI Makes Quantum Field Theories Computable
Researchers at TU Wien, together with U.S. and Swiss teams, have used a custom neural network to optimize lattice formulations of quantum field theories. The AI‑driven approach parameterizes the action on coarse lattices while preserving fixed‑point properties, yielding errors far...
Superconducting Nanowire Memory Array Achieves Significantly Lower Error Rate
MIT researchers have demonstrated a 4 × 4 superconducting nanowire memory array that operates at 1.3 K and delivers a bit‑error rate of roughly 10⁻⁵, a ten‑fold improvement over earlier designs. The cell architecture combines temperature‑dependent switches with a kinetic inductor, enabling precise...
Particle Permutation Task Can Be Tackled by Quantum but Not Classical Computers, Study Finds
Researchers at the Autonomous University of Barcelona and CUNY’s Hunter College have shown that quantum computers can determine the even‑odd parity of particle permutations without labeling each particle, a task impossible for classical computers. By preparing qubits in entangled states...
Entangled Atomic Clouds Enable More Precise Quantum Measurements
Researchers at the University of Basel and France's Laboratoire Kastler Brossel have demonstrated that three spatially separated atomic clouds can be entangled to perform multiparameter quantum measurements with unprecedented precision. By first creating a collective spin‑squeezed state and then dividing...
3D-Printed Surfaces Help Atoms Play Ball to Improve Quantum Sensors
Scientists at the University of Nottingham have 3D‑printed titanium alloy surfaces with intricate hexagonal and conical textures that steer gas particles away from quantum sensors. By integrating these patterns into a surface‑based vacuum pump, they achieved a 3.8‑fold increase in...
Magnetic 'Sweet Spots' Enable Optimal Operation of Hole Spin Qubits
Researchers at the CEA‑Irig Pheliqs lab have identified specific magnetic‑field orientations, termed “sweet spots,” that render silicon hole spin qubits insensitive to electrical charge noise while preserving fast electric‑driven control. Experiments on single‑hole quantum dots demonstrated a marked increase in...
Too Much Entanglement? Quantum Networks Can Suffer From 'Selfish Routing,' Study Shows
Northwestern researchers have demonstrated that in multi‑user quantum communication networks, increasing the amount of shared entanglement can paradoxically degrade overall fidelity when each pair routes selfishly. By modeling non‑cooperative routing decisions, they showed that mixed entangled states generate a quantum...
New Cryogenic Vacuum Chamber Cuts Noise for Quantum Ion Trapping
Georgia Tech Research Institute unveiled a cryogenic vacuum chamber that dramatically reduces vibration and magnetic‑field noise for trapped‑ion quantum experiments. The design embeds magnetic shielding inside the chamber and uses ceramic‑plastic posts for vibration isolation, while an integrated RF coil...
It Started with a Cat: How 100 Years of Quantum Weirdness Powers Today's Tech
A new perspective piece in Science by Dr. Marlan Scully chronicles a century of quantum mechanics, tracing its evolution from Schrödinger’s cat paradox to the technologies that define modern life. He highlights how quantum coherence gave rise to lasers, entanglement...
New Method Reveals Quantum States Using Indirect Measurements of Particle Flows
A University of Geneva team has introduced a quantum state tomography technique that infers the full state of an open quantum system from transport measurements of particle flows, rather than direct projective measurements. By exploiting currents and their correlations across...
Building the World's First Open-Source Quantum Computer
Researchers at the University of Waterloo and the Institute for Quantum Computing have launched Open Quantum Design, the world’s first open‑source, full‑stack quantum computer built on ion‑trapping technology. The non‑profit OQD brings together more than 30 software contributors, dozens of...
Stealth Quantum Sensors Unlock Possibilities Anywhere GPS Doesn't Work
Phantom Photonics, a Waterloo‑spun quantum‑tech startup, is commercialising ultra‑sensitive quantum sensors that can filter background noise and detect single photons. The devices exploit a robust form of quantum coherence, allowing precise measurements in GPS‑denied environments such as deep‑sea or space....
How Pointing Errors Impact Quantum Key Distribution Systems
A new IEEE study introduces an analytical framework that quantifies how pointing errors degrade quantum key distribution (QKD) performance in optical wireless links. By applying Rayleigh and Hoyt statistical models to beam misalignment, the researchers derived closed‑form expressions for error...
Quantum 'Alchemy' Made Feasible with Excitons
Researchers at OIST and Stanford have shown that excitons—electron‑hole pairs—can drive Floquet engineering far more efficiently than conventional laser light. By generating dense exciton populations in atomically thin semiconductors, they observed pronounced band‑structure hybridization with a Mexican‑hat dispersion using time‑...
Detecting Single-Electron Qubits: Microwaves Could Probe Quantum States Above Liquid Helium
Researchers at RIKEN have demonstrated that microwave‑driven transitions of electrons floating above liquid helium can be detected through changes in quantum capacitance. By using ten million surface electrons as a macroscopic capacitor, they measured the Rydberg‑state transition via microwave frequency modulation....
Honeycomb Lattice Sweetens Quantum Materials Development
Researchers at DOE’s Oak Ridge National Laboratory have successfully synthesized a magnetic honeycomb lattice of potassium cobalt arsenate and performed the most detailed characterization to date. The distorted honeycomb structure leads to strong coupling of cobalt spins, placing the material...
X-Ray Four-Wave Mixing Captures Elusive Electron Interactions Inside Atoms and Molecules
Scientists at SwissFEL have achieved the first X‑ray four‑wave mixing experiment, directly observing electron‑electron coherences in neon gas. The method uses three synchronized X‑ray pulses to generate a fourth signal, requiring ultrabright, ultrashort FEL bursts and nanometre‑scale beam alignment. By...
Turning Crystal Flaws Into Quantum Highways: A New Route Towards Scalable Solid-State Qubits
A new theoretical study shows that crystal dislocations, traditionally seen as defects, can serve as quantum highways for nitrogen‑vacancy (NV) centers in diamond. Using GPU‑accelerated first‑principles simulations, researchers from Ohio State and the University of Chicago demonstrated that NV qubits...
Neutral-Atom Arrays, a Rapidly Emerging Quantum Computing Platform, Get a Boost From Researchers
Columbia researchers have combined optical tweezers with nanophotonic metasurfaces to create a 600 × 600 neutral‑atom array, yielding 360,000 individual traps on a 3.5 mm chip. They demonstrated trapping of 1,000 strontium atoms and showed the design can scale beyond 100,000 qubits with...
Quantum Simulator Reveals How Vibrations Steer Energy Flow in Molecules
Rice University physicists used a trapped‑ion quantum simulator to emulate a two‑site molecule coupled to two distinct vibrational modes. By independently tuning donor‑acceptor coupling, vibration strength, and environmental dissipation, they directly observed how energy migrates between sites. The experiment showed...
New State of Matter Discovered in a Quantum Material
Researchers at TU Wien have identified an emergent topological semimetal phase in the quantum‑critical material CeRu₄Sn₆, observed at temperatures just above absolute zero. The discovery shows that topological states can exist even when the conventional particle‑like description of electrons fails, as...
