Quantum Computing
Learn about quantum algorithms, quantum information theory, and quantum computing applications
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Sun, Jul 5
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Abdelmalek Essaadi University Team Models Thermometric Scaling Laws for Quantum Sensor Design
A temperature-sensing performance that decays as the fourth power of temperature, T⁻⁴, distinguishes finite-spectrum quantum probes from those with unbounded spectra, which fall more slowly as T⁻². This work establishes a direct link between a quantum system’s energy levels and its ability to measure temperature, moving beyond simply acknowledging spectral influence. Identifying these distinct high-temperature behaviours offers a valuable design principle for optimising temperature sensors fo...
Why is the graviton important when (to my knowledge) gravity isn't a force and thus doesn't need a mediating quantum particle?
It seems to me that General Relativity is accepted at this point, even in the case of Quantum Mechanics, and my understanding is that GR establishes that gravity isn't a force but just an observed effect of curved space-time. Why, then, is a gravity boson necessary at all? If we have a mediating particle for the 3 fundamental forces that are actually forces, doesn't it make sense that the reason we haven't found the graviton is because it doesn't exist because there's no force for it to mediate?
$4M NSF Award Develops Ohio State Quantum Sensing Platform
Ohio State secured a $4 million NSF award to develop next-generation quantum sensing technologies, advancing a national effort focused on materials &.
Quantum-Classical Orchestration Explained: How Hybrid Quantum Computing Works
Quantum-classical orchestration is the software and control layer that fuses classical computing, the CPUs, GPUs and supercomputers we already run, with quantum processing units inside a single workflow. It matters because a quantum computer on its own does almost nothing useful, since the classical machine prepares the problem, suppresses errors, decodes the results and decides […]
Ningbo University: Researchers Find Measurements Vary in Susceptibility to Noise
Towards Robust Optimal Measurements Against Noise in Quantum Metrology Measurements previously assessed for precision are now demonstrably ranked by their susceptibility to noise, revealing which schemes falter most under real-world conditions. Experiments utilising a polarizing Mach-Zehnder interferometer confirm that Fisher information measurement noise susceptibility (FI MENOS) defines the absolute limit of estimation precision. This work offers a new means of evaluating how well quantum m...
IEEE: Fast Thermalization Achieved With Recent Quantum Algorithm
Quantum algorithms efficiently achieve thermalization, a key challenge in quantum simulation, using a new method to prepare equilibrium states.
Guida and Colleagues Model Topological Entanglement Persistence for Robust Quantum States
Can topological order survive continuous monitoring and dissipation in a system where particle number isn’t conserved. Measurements on a superconducting Rashba nanowire reveal the disconnected entanglement entropy, a marker of topological stability, persists for a duration scaling linearly with the system size, despite boundary dissipation affecting Majorana modes. This extends previous observations from systems with particle conservation to a more complex, open quantum system.
Jahrom University Team Models Gaussian Quantum Channel for Cloaked-Object Detectability
Reducing an object’s classical scattering strength does not guarantee its quantum invisibility, as a detectable parameter imprint can still survive in the detected light. The analysis reveals classical scattering, scaling with ∣sm∣2, differs from quantum sensitivity, which scales with ∣∂θsm∣2, demonstrating diminished amplitude does not equate to eliminated sensitivity. This establishes a new criterion for quantum undetectability, demanding detected light’s first and second moments be indepen...
Technological University Team Presents Exact Influence Functional for Entanglement Analysis
Until now, understanding how complex quantum systems simplify has relied on indirect methods, like inferring behaviour from the final, smoothed result. This work directly reveals the discarding of quantum information, demonstrating how non-Gaussian states on a lattice transform into predictable, quadratic forms during simplification. Exact calculations and entanglement analysis confirm this evolution, offering a new way to analyse complex materials.
National Tsing Hua University: Researchers Achieve Device-Independent Quantum Steering with Gaussian Protocols
Extending dependable quantum communication beyond fully trusted networks has long demanded simpler certification protocols. Now, measurement-device-independent steering detection extends to network scenarios and continuous-variable systems, a leap beyond previous discrete-variable limitations. This advance establishes a foundation for applications like randomness generation with reduced reliance on fully trusted devices.
Q-CTRL’s Series Aims to Close 50% Quantum Job Gap by 2025
Q-CTRL launched a free online masterclass series, utilizing Black Opal’s learning modules, to address a projected shortfall in qualified quantum computing employees. The initiative aims to equip individuals with foundational skills and hands-on experience, helping to close an anticipated job gap by 2025.
How OLCF’s QCUP Enabled Particle Physics on IBM Quantum
Leveraging the OLCF’s Quantum Computer User Program, QCUP, researchers simulated hadronization on IBM quantum hardware.
Quantum Circuits Explained: 40 Essential Design Patterns
Quantum circuits are the assembly language of quantum computing, the level where abstract algorithms turn into concrete sequences of gates a machine can run. Read enough of them and the same shapes keep returning, a Hadamard opening here, a controlled rotation there, a measurement feeding a correction at the end. This guide collects forty of […]
China Mobile: Integrated Photonics Yield 688 Hz, 956% Fidelity 5-Qubit Entanglement
Researchers achieved a 5-qubit entangled state using a Ququart Encoding scheme, demonstrating 956 fidelity at 688 Hz with photonic qubits.
Arvind Krishna Confirms First IBM Quantum Computer for India
IBM will establish one of India’s first quantum computers in Amaravati by September 2026, supporting Andhra Pradesh’s ambition to become a quantum technology hub. This system is intended to aid research, startups, and enterprises with advanced quantum computing capabilities.
Hunan Normal Researchers Model Quantum Advantage in Turbulence
Researchers at Hunan Normal University are modeling quantum illumination’s potential advantage in detecting targets, despite challenges posed by atmospheric turbulence. Evaluating quantum advantage in real-time, under dynamic atmospheric conditions, remains a key unresolved issue for practical free-space applications.
Indian Institute of Technology Kanpur: Researchers Unlock Radial Schmidt Mode Detection for Quantum Information Science
Radial Schmidt mode detector of entangled photons Until now, accessing the full potential of entangled photons has been limited by the difficulty of measuring their complex radial structure. Measurements have progressed from four detectable modes with poor efficiency to a new system capable of resolving 50 radial Schmidt modes with approximately 98% fidelity. This advance directly addresses a longstanding challenge, opening new avenues for manipulating and utilising high-dimensional quantum e...
Tsinghua University Team Proposes Geometrical-Configuration Modulation Framework for Free-Space QKD
Can a quantum link maintain stable communication when buffeted by atmospheric turbulence and subtle alignment shifts. A new framework addresses slowly varying centre drift in free-space quantum key distribution by utilising photon source separation as a modulation variable. This geometrical-configuration modulation, and specifically the $R-Δx$ protocol, offers a potential pathway to more dependable quantum transmissions.
Institute of Science and Technology Austria (ISTA): Researchers Create Hybrid Light-Matter States Using Molecular Rotations and Quantum Cavities
Collective molecular rotations now generate cat states with a coupling strength enhanced by a factor of √N, a collective effect previously unobserved. This theoretical derivation establishes the first explicit Krylov bright-manifold construction for rotor-cavity coupling. Consequently, a new pathway to hybrid light-matter quantum states has opened, utilising intrinsic molecular properties rather than fabricated components.
Quaid-I-Azam University Team Models Multipartite System Dynamics for Quantum Parameter Estimation
Until now, detailed analysis of how combined nonlinear optical effects and intrinsic decoherence impact quantum correlations in multi-atom systems has been lacking. This work bridges that gap, comprehensively examining the simultaneous evolution of global quantum discord and quantum Fisher information under Kerr nonlinearity and parametric amplification. Increasing atomic number generally enhances discord, yet quantum Fisher information does not always follow suit, revealing a nuanced interpl...
Humar and Colleagues Models Resonant Domain Growth for Understanding Metastable States
Domain growth now overwhelms nucleation in a simulated false vacuum, a reversal of the behaviour previously understood. Realised on a 4000-qubit quantum annealer, this system exhibits nearly ballistic expansion of stable regions, alongside interface broadening consistent with established theoretical predictions. This demonstration opens a new avenue for exploring complex, nonequilibrium dynamics in cosmology and quantum materials.
Peking University Team Develops Bias-Corrected Moment Estimator for Quantum Metrology
Existing quantum estimation methods typically detail *if* optimal sensitivity can be reached, not *how quickly*. Now, a bias-corrected estimator achieves sensitivity corrections beyond standard error propagation, scaling to order ν⁻³, and identifies conditions where the common 1/ν² correction vanishes entirely. This allows quantification of the measurements needed to realise asymptotic sensitivity in practical quantum sensing.
Quantum Zeitgeist Weekly Digest
Welcome to this week’s quantum technology digest. The past seven days brought developments across multiple facets of the field, from hardware advancements in error correction to increasing commercialization efforts. Several companies are making moves to expand access to quantum resources and build out domestic capabilities. This week’s news demonstrates a clear focus on improving the […]
Quantum Software Lab: £6.2M Funds Tools Tracking Quantum Threats to UK Energy
A £6.2M award funds researchers at the University of Edinburgh’s Quantum Software Lab to develop tools tracking quantum threats to the UK energy.
CNRS: Two Architectures Yield Random States with Local Measurements
Generating random quantum states, vital for quantum computing, is tackled using random Matrix Product States, created by distinct quantum circuit.
South Korea Expands International Alliances with Canada, UK, and EU at Quantum Korea 2026
South Korea's Ministry of Science and ICT (MSIT) has leveraged the Quantum Korea 2026 exhibition at the Dongdaemun Design Plaza (DDP) in Seoul as a centralized geopolitical cooperation platform. Amid tightening global export controls on deep-tech materials, Deputy Prime Minister and Minister of Science and ICT Hongwoong Bae along with First Vice Minister Hyeok-chae Koo [...] The post South Korea Expands International Alliances with Canada, UK, and EU at Quantum Korea 2026 appeared first on Q...
IBM to Commission One of India’s First Physical Quantum Computers in Amaravati by September 2026
IBM Chairman and Chief Executive Officer Arvind Krishna has confirmed that the greenfield city of Amaravati will host one of the first two physical IBM quantum computers deployed on-shore in India. Targeted for full operational commissioning by September 2026, the hardware deployment represents a key anchor transaction for the state of Andhra Pradesh's Quantum Valley [...] The post IBM to Commission One of India’s First Physical Quantum Computers in Amaravati by September 2026 appeared...
IBM Quantum Credits Program Drives Advanced Algorithmic Breakthroughs Beyond Classical Limits
IBM Quantum has released a technical review detailing the initial research outcomes generated by its expanded IBM Quantum Credits program. Spearheaded by IBM Fellow and Director of IBM Research Jay Gambetta, the merit-based program allocates free, direct processing time on high-performance quantum computing units (QPUs) to tenure-track faculty and corporate research scientists. The initiative aims [...] The post IBM Quantum Credits Program Drives Advanced Algorithmic Breakthroughs Beyond Cla...
Who’s News: Strategic Appointments at Silicon Quantum Computing, Pasqal, JIJ, IQM Quantum Computers, IBM, and PostScriptum
Silicon Quantum Computing (SQC) has appointed Karna Nisewaner as Chief Legal Officer, effective June 1, 2026. Nisewaner has over 25 years of legal experience within the semiconductor and artificial intelligence sectors, most recently serving as General Counsel and Corporate Secretary at Cadence Design Systems. Based in Palo Alto, California, she will oversee SQC’s global corporate [...] The post Who’s News: Strategic Appointments at Silicon Quantum Computing, Pasqal, JIJ, IQM Quantum Compute...
Shanghai Expands Quantum Foothold with Xuhui Cultivation Zone and Zhangjiang Quantum Bay Dual Hubs
The municipal government of Shanghai has accelerated its multi-district industrial layout by executing sequential rollouts of two primary quantum infrastructure developments: the newly unveiled "Zhangjiang Quantum Bay" in the Pudong New Area on June 27, 2026, followed by the launch of the Shanghai Quantum Computing Future Industry Incubation Zone in Xuhui District on June 30, [...] The post Shanghai Expands Quantum Foothold with Xuhui Cultivation Zone and Zhangjiang Quantum Bay Dual Hubs app...
LBNL Researcher Leverages 104 Qubits on IBM Heron to Simulate Subatomic Hadronization
A research collaboration led by the Lawrence Berkeley National Laboratory (LBNL) has successfully simulated hadronization—the fundamental particle physics process where quarks bind via the strong nuclear force to create composite hadrons like protons and neutrons—on a physical quantum processor. Executed by LBNL research scientist Anthony Ciavarella and published in Physical Review D, the simulation mapped [...] The post LBNL Researcher Leverages 104 Qubits on IBM Heron to Simulate Subatomic...
University of Sydney and IBM Quantify Mid-Circuit Measurement Bottlenecks to Advance Fault-Tolerant Logic
IBM Quantum System Two in Poughkeepsie, New York. The machine was used in the experiments conducted by University of Sydney quantum physicists. Photo: IBM A joint research collaboration between the University of Sydney Nano Institute and IBM Quantum has identified, isolated, and mitigated a major hardware engineering bottleneck hindering Fault-Tolerant Quantum Computing (FTQC). Published in [...] The post University of Sydney and IBM Quantify Mid-Circuit Measurement Bottlenecks to Advance Fa...