Latest Quantum Research & Methods News
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Oct- 2026 -17 OctoberResearch
Google Ran Magic State Cultivation on Willow and Cut Magic-State Error 40-Fold. The Test Covered Only the Protocol’s Smallest Version.
Google put an upper bound of one to two in 10,000 on the error of T states cultivated on Willow. The result supports one assumption in Google's sub-million-qubit RSA-2048 estimate and leaves the rest of a factory untested.
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10 OctoberResearch
IBM and Rutgers Controlled Quantum Chaos on 100 Qubits With Thousands of Mid-Circuit Resets. The Experiment Was Not Quantum Error Correction.
In a Nature Physics paper, IBM and Rutgers researchers drove 100 superconducting qubits from chaotic to controlled dynamics with mid-circuit resets. The physics is sound. The error-correction framing in the Rutgers announcement goes beyond anything the experiment tested.
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9 OctoberResearch
IonQ Entangles a Trapped Ion With a Diamond Memory 1,000 Times a Second at 88% Fidelity. Its Own Paper Puts the Rate Needed Between Modules 10 to 100 Times Higher.
IonQ's preprint entangles a barium ion with a silicon-vacancy memory in diamond at four times the rate of the fastest photonic link between two trapped ions. I compare it with what error-corrected modules need and with IonQ's press release.
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6 OctoberResearch
Modular Quantum Error Correction: 10x in Simulation
Google Quantum AI and DeepMind simulated a modular error-correction memory that needs a tenth of the surface code's physical qubits per logical qubit. The abstract's 30× figure comes from codes too large to simulate.
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1 OctoberResearch
QuTech Builds Leakage Removal Into Qubit Readout, and Its Clearest Gain Is in Stability Experiments
QuTech's leakage reduction unit works inside a qubit measurement and adds no time to two-level readout. At baseline leakage it left memory-experiment error rates unchanged but raised a stability experiment's error-suppression factor by 29%, or 54% with three-level readout.
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Sep- 2026 -30 SeptemberResearch
Researchers Reviewed 53 Quantum Computing Studies in Bioinformatics. Two-Thirds Never Used a Quantum Computer.
A systematic review of 53 peer-reviewed studies applying quantum computing to genomics, protein structure and biomedical data found most ran on classical computers, used reduced datasets and seldom published both code and data.
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24 SeptemberResearch
Microsoft and Qolab Propose Four Conditions for a Scalable Logical Qubit. DOE’s $215 Million Competition Leaves Its Test to Negotiation.
Troyer, Nayak and Martinis want the word scalable reserved for logical qubits kept alive by repeated error correction and real-time decoding. I checked ten studies and announcements since April 2024 against their conditions and DOE's new competition rules.
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18 SeptemberResearch
Physicists in Guangzhou Confirm Feynman’s Path-Integral Rules With Single Photons, but Not That They Take Every Path
South China Normal University physicists measured single-photon propagators at 98.5% fidelity and multiplied them into 1.4 million path amplitudes. Quantum mechanics, its rival interpretations and classical wave optics predict the same propagators.
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18 SeptemberResearch
Stuttgart Physicists Measure an 11.5-Millisecond Lifetime for Circular Rydberg Atoms at Room Temperature. The Group’s Best Circular-Qubit Coherence Time Is Still 278 Microseconds.
A Stuttgart group used two coated glass plates to keep trapped strontium atoms in circular Rydberg states for over 10 ms without a cryostat. I check the three claimed records and what neutral-atom qubits still need.
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16 SeptemberResearch
UPenn Turns Diamond Crosstalk Into a Four-Qubit Entangling Gate at Room Temperature
University of Pennsylvania researchers generated a four-qubit entangled state inside a diamond at room temperature in 14.8 microseconds – about ten times faster than the sequential approach tested in the same register – by converting crosstalk into parallel conditional gates.
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12 SeptemberResearch
IBM’s Spacetime PEC Cuts Error-Mitigation Sampling Overhead 63× – But the Exponential Wall Remains
IBM researchers combined probabilistic error cancellation with post-selected error detection, reducing sampling overhead by up to 63× on a 49-qubit subset of IBM's 156-qubit Heron processor. The result extends near-term error mitigation but does not eliminate its exponential cost.
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10 SeptemberResearch
Quantum Capability Has Doubled Every One to Two Years. Sandia Says the Early-2030s Roadmaps Need Four Times That.
A Sandia-led team ran identical circuits on Google, IBM and Quantinuum processors, then on a fault-tolerant architecture built from logical qubits. The encoded version reached 2.7% of the raw machine's score.
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10 SeptemberResearch
Chip-Based QKD Has a Glow Problem: VOA Luminescence Creates a Side Channel That Standard Security Analyses Miss
A peer-reviewed study finds that variable optical attenuators in integrated QKD chips emit unintended light near 1107 nm. The emission creates a wavelength-resolved side channel that standard BB84 security analyses do not account for, and the modeled impact on key rates is severe.
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8 SeptemberResearch
IonQ Compiles Shor’s Attack on secp256k1 Down to 19,397 Ions and 26 Days per Attempt
IonQ has compiled a full ECDLP-256 attack to a trapped-ion design that does not exist, charging every Clifford, measurement and ion transport. The accounting is the most detailed I have seen. The error rates, cycle time and machine are assumptions.
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Aug- 2026 -26 AugustIndustry
IBM Connected Two Quantum Cryostats. The Three Numbers That Matter Were Not in the Press Release
IBM has connected and cooled two modular cryogenic cells. Beyond the press release, its specification sheet and briefing coverage disclose 30 kW per module, 23 mK with a simulated payload, and 99.3 percent interconnect fidelity. The design also requires warming the connected system for cryogenic repairs.
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