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Quantum Computing

All articles tagged with #quantum computing

science6 days ago•4 min saved

Kyoto and Hiroshima Teams Solve 25-Year Puzzle in Measuring W-State Quantum Entanglement

Physicists from Kyoto and Hiroshima universities have achieved the first experimental measurement of W-state quantum entanglement in three photons, a capability that had remained theoretical for over 25 years. Published in Science Advances in September 2025, the study introduces a one-shot measurement technique using a custom discrete Fourier transform optical circuit. This method bypasses the inefficiencies of traditional quantum tomography, which requires exponentially more measurements as particle numbers increase. The team achieved a measurement discrimination fidelity of 0.871, exceeding the 66.7% threshold required to prove three-particle entanglement. This breakthrough offers a more efficient path for developing quantum communication, teleportation, and computing technologies.

via ScienceAlert|

#photonic-circuits #quantum-computing #quantum-entanglement

science11 days ago•1 min saved

Kyoto and Hiroshima Researchers Achieve First Experimental W-State Quantum Measurement

Researchers at Kyoto University and Hiroshima University have experimentally demonstrated a new method to identify W-state quantum entanglement, a capability that had remained unproven for over 25 years. By utilizing cyclic shift symmetry and photonic quantum circuits, the team successfully distinguished three-photon W states with high fidelity. This breakthrough offers a more efficient alternative to traditional quantum tomography, potentially accelerating the development of quantum teleportation, communication protocols, and measurement-based computing. The team plans to scale this technique to larger photon numbers and integrate it into compact on-chip devices.

via ScienceDaily|

#entanglement #optical-circuits #photonics

science11 days ago•2 min saved

Quantum Simulators Reveal Edge-Driven Mechanism for Particle Creation

A Duke-led team used a trapped-ion quantum simulator to model 'string breaking,' a process where energy creates new particle pairs. Published in Nature Physics, the study reveals that new charges form at the edges of the string before spreading inward, differing from traditional theories. This work joins similar experiments by Google and QuEra, marking a key step in using quantum hardware to simulate high-energy physics.

via ScienceDaily|

#nature-physics #particle-physics #quantum-computing

science-and-technology12 days ago•12 min saved

NMR Spectroscopy Evolves: From Nobel-Winning Foundations to Quantum and Medical Frontiers

Nuclear magnetic resonance (NMR) spectroscopy has transformed from a 1930s physics experiment into a cornerstone of chemical analysis, largely due to Richard Ernst’s 1991 Nobel-winning innovations in Fourier transform and 2D NMR. Despite persistent limitations in sensitivity and the need for expensive superconducting magnets, modern advancements in hyperpolarisation, microcoils, and benchtop systems are expanding its utility. Researchers are now applying NMR to study working batteries, corrosion, and lung conditions using xenon-129, while also leveraging its principles for quantum computing, proving the technique remains vital decades after its inception.

via Chemistry World|

#hyperpolarisation #medical-imaging #nmr-spectroscopy

technology16 days ago•127 min saved

Japan Launches Shunkai, Its First Full-Stack Room-Temperature Quantum Computer

Japan has activated Shunkai, its first full-stack quantum computer that operates at room temperature. The system uses neutral atoms trapped by optical tweezers and currently features 50 qubits. Researchers plan to scale the machine to 10,000 qubits by March 2031 to enable practical quantum error correction and open access for external users.

via Live Science|

#japan #neutral-atoms #optical-tweezers

science17 days ago•5 min saved

Stanford Team Captures First Real-Time Quantum Jumps of Sound

Stanford researchers have achieved the first direct observation of quantum jumps in sound, watching individual phonons abruptly transition between energy states in real time. Published in Science, this breakthrough confirms that mechanical vibrations behave quantum mechanically, opening new pathways for quantum computing, error correction, and ultra-precise biological sensing.

via ScienceDaily|

#mechanical-resonators #phonons #quantum-computing

technology1 month ago•4 min saved

IonQ's Quantum Leap: SkyWater Tie-In Triggers $1.8B Deal and Revenue Surge

IonQ used its investor day to unveil Superion, its sixth-generation quantum system built with SkyWater processors and slated for 2027 shipments, following a $1.8 billion SkyWater acquisition that boosted the full-year revenue guide to $450–$460 million from $280–$290 million. The event also featured an $8.18 million security agreement with Congruity360 and underscored IonQ’s push into adjacent areas like networking, cybersecurity, and government/enterprise partnerships as it aims to become a leading quantum technology supplier.

via Barron's|

#acquisition #ionq #quantum-computing

technology1 month ago•7 min saved

Quantum Swapper Test Reveals Exponential Edge Over Classical Computers

Researchers devised a complement-sampling game to test quantum hardware and prove a provable exponential gap between the best classical strategies and an ideal quantum system. Using Quantinuum’s trapped-ion H2 computers, they scaled the test to as many as 37-bit strings, and showed the quantum approach consistently beating the classical limit despite hardware noise, thanks to quantum superposition and a novel swapper circuit. The study offers a scalable, verification-friendly proof of quantum advantage, though the referee and player were on the same machine; future work will connect separate quantum devices over a quantum channel. Nature Communications (2026).

via ScienceAlert|

#classical-limits #complement-sampling #quantum-computing

technology1 month ago•4 min saved

Quantum battery charges in femtoseconds but stores only tiny energy

A CSIRO-led team built a prototype quantum battery that charges in femtoseconds via a superabsorption effect in an optical microcavity, but it stores only a nanoscopic amount of energy for nanoseconds. While not ready to power devices, the work proves rapid energy absorption and extraction is possible and points to potential uses in quantum hardware and faster energy delivery, with ongoing efforts to boost capacity, storage time, and scalability through hybrid quantum-classical designs and linking multiple cells, all at room temperature.

via TechSpot|

#energy-storage #femtoseconds #quantum-battery

technology1 month ago•3 min saved

IBM Demonstrates Quantum Advantage with 70 Logical Qubits in 15 Minutes

IBM and the University of Chicago used a 70-qubit logical-qubit, error-corrected quantum circuit to perform a classically intractable calculation in about 15 minutes, far faster than practical classical methods. They also introduced a structured verification approach that preserves the problem’s hardness while enabling error detection, addressing a major challenge in proving quantum advantage. The work, involving 2,415 logical two-qubit operations and 468 logical T gates, showcases large-scale encoded quantum computing and moves toward more trustworthy, scalable quantum machines.

via Science Daily|

#logical-qubits #quantum-advantage #quantum-computing

business1 month ago•5 min saved

Pasqal Surges 40% on Nasdaq Debut After SPAC Merger

French neutral-atom quantum computer developer Pasqal debuts on Nasdaq via a merger with SPAC Bleichroeder Acquisition II, jumping about 40% on its first trading day. The deal comes as Pasqal expands with a Saudi JV through Eleven Ventures to push into the MENA region, strengthens its U.S. presence with a Chicago HQ, and counts Nobel-laureate Alain Aspect among its co-founders, underscoring growing market interest in quantum tech.

via Barron's|

#business #eleven-ventures #nasdaq

technology1 month ago•14 min saved

Quantum batteries defy charging rules by charging faster as they grow

Scientists at CSIRO have unveiled the world’s first working quantum battery prototype that charges faster as its size increases due to a quantum effect called superabsorption inside an optical microcavity. The setup enables femtosecond charging and nanosecond energy storage at room temperature, offering a proof of concept that quantum devices could be powered more efficiently—and perhaps someday energize everyday gadgets. However, the energy stored today is tiny, and challenges like decoherence and energy extraction remain, leaving the path to practical, large-scale use uncertain and likely focused on quantum computing first.

via BBC|

#energy-storage #optical-microcavity #quantum-battery

technology1 month ago•19 min saved

Krypton sputtering unlocks low-temperature Ta films for scalable quantum devices

Researchers show krypton gas in magnetron sputtering enables cubic bcc tantalum films on silicon at around 200°C, broadening the fabrication window for quantum hardware. These krypton-sputtered Ta films deliver low microwave losses in resonators, while higher-temperature Ta films suffer from Ta–Si intermixing and higher losses. Notably, transmon qubits fabricated with these films achieved a compact 20‑μm capacitor gap and quality factors up to 16.9 million, indicating a scalable route to high-performance superconducting quantum devices.

via Nature|

#krypton-sputtering #note-extra-tag-removed-to-fit-5-total #quantum-computing

technology2 months ago•8 min saved

AWS Quantum Claim Challenges Lattice-Crypto Foundations

An AWS cryptography researcher’s preprint claims a polynomial-time quantum algorithm for the Dihedral Coset Problem, which could theoretically enable efficient solutions to lattice problems underpinning post-quantum cryptography. The work is preliminary and theoretical, does not attack deployed standards or estimate hardware needs, and will require independent peer review to verify its correctness, practicality, and implications for real-world cryptography.

via The Quantum Insider|

#dihedral-coset-problem #lattice-cryptography #polynomial-time-algorithm

technology2 months ago•110 min saved

IBM claims quantum advantage in three experiments, invites verification

IBM and partner teams report achieving quantum advantage in three experiments on its Quantum Heron R3 system, using quantum error mitigation to validate results against a classical supercomputer (Fugaku) and testing both Floquet Ising-model computations and Clifford/T-gate circuits; the results, posted as arXiv preprints, aim to establish a verifiable trust stack but require independent verification as classical challenges continue, underscoring that quantum advantage is still an early, contestable milestone.

via Live Science|

#error-mitigation #floquet-transverse-field-ising-model #ibm