Two measurement-based gauging constructions—homological and graph-based—yield non-Abelian qLDPC codes from Abelian CSS codes, enabling magic state preparation and universal quantum computation via logical Clifford measurement on any qLDPC code.
#qLDPC #QuantumErrorCorrection #Research
New procedure achieves check weight 6 & qubit degree 6 for any CSS code using surface code patches as Layer Codes—simpler than prior methods, no expander graphs needed, suited for modular superconducting/neutral-atom architectures.
#QuantumErrorCorrection #LDPC #Research
New ancilla construction reduces qLDPC code surgery overhead from O(W log³W) to O(W log W) using parsimonious coning, improving extractors, parallel measurement, universal adapters, and single/constant-time surgery schemes.
#QuantumErrorCorrection #qLDPC #Research
New recursive 15-to-1 magic state distillation reduces |T⟩ prep to a d×3d qubit footprint at 15d cycles and |CCZ⟩ to 3d×2d at 10.5d cycles—cutting spacetime cost 4× vs prior art, though requiring lower physical error thresholds.
#QuantumErrorCorrection #FaultTolerantQuantumComputing #Research
A MAP-enhanced generalized belief propagation decoder for quantum Tanner codes significantly outperforms standard BP and Relay-BP decoders in finite-length regimes, with Tanner codes surpassing GB and LP codes of comparable parameters.
#QuantumErrorCorrection #qLDPC #Research
BB codes achieve 97.6% of the erasure channel capacity limit via BP-OSD decoding (p*∞≈0.488), with 12× lower qubit overhead than surface codes—but fair comparison requires erasure-aware MWPM baselines, as uninformed MWPM matches random guessing.
#QLDPC #QuantumErrorCorrection #Research
IBM Research identifies weight-4/5 error syndromes causing slow or failed BP convergence in the gross LDPC code, characterizes their Tanner subgraph structure, and shows decoding matrix amendment reduces logical errors exponentially.
#QuantumErrorCorrection #LDPC #Research
New stabilizer formalism for EAQECCs with noisy entanglement bits generalizes prior schemes, enabling construction of codes that outperform optimal stabilizer codes of equivalent error-correcting capability under depolarizing noise.
#QuantumErrorCorrection #EAQECC #Research
New measure C(ρ)—ℓ₁ Wigner distance to stabilizer polytope—reveals exact integer tightness ratios κ=1,2 for qubit families, connecting phase-space geometry to error correction: magic is a fault-tolerant logical-layer observable.
#QuantumMagic #QuantumErrorCorrection #Research
New algorithm synthesizes n-qubit Clifford unitaries using ≤2n multi-qubit measurements in two commuting sets of ≤n, enabling flexible space-time trade-offs for fault-tolerant lattice surgery and quantum LDPC hardware implementations.
#CliffordSynthesis #QuantumErrorCorrection #Research
New decoder exploits correlated atom loss in neutral-atom quantum processors, boosting surface code loss threshold from 3.2% to 4% and cutting logical error rates by ~10x, with real-time compatible sub-millisecond operation.
#NeutralAtomQC #QuantumErrorCorrection #Research
Nord Quantique demonstrates the first experimental realization of the Tesseract two-mode bosonic grid code, achieving zero observable logical decay over 32 QEC rounds via erasure-based error suppression—surpassing single-mode GKP performance.
#QuantumErrorCorrection #BosonicQubits #News
Nord Quantique demonstrates first-ever QEC using the Tesseract code — a multimode bosonic code encoding logical qubits in two superconducting cavities via 4D phase space, outperforming single-mode GKP qubits with hardware-efficient fault tolerance.
#QuantumErrorCorrection #BosonicQubits #News
Canadian firm Nord Quantique secured a $5M (up to $15M) DARPA QBI Stage B contract, validating its bosonic multi-mode superconducting qubit approach achieving a 1:1 physical-to-logical qubit ratio — targeting utility-scale quantum computing by 2033.
#QuantumErrorCorrection #DARPA #News
Rigetti's Stefano Poletto details a proprietary adiabatic CZ gate reaching 99.9% two-qubit fidelity by pulsing only the tunable coupler — a key step toward quantum error correction-ready superconducting processors.
#QuantumComputing #QuantumErrorCorrection #News
Yale & U-Michigan researchers prove minimum-weight decoding is NP-hard for color code, surface code, and transversal CNOT variants via 3D matching reduction, establishing a fundamental scalability barrier for fault-tolerant QEC.
#QuantumErrorCorrection #NPHard #News
Chalmers & Gothenburg researchers built an FPGA-accelerated Graph Neural Network decoder achieving <1μs latency with a 1.47×10⁻⁵ error rate — 13% better than MWPM — for surface codes up to distance 7.
#QuantumErrorCorrection #FPGA #News
#QuantumErrorCorrection is hard, but a softer approach can help!
Instead of relying on 0/1 outcomes, soft decoders use rich analogue readout data to better judge when a qubit measurement is uncertain, leading to stronger error suppression with fewer qubits
🔗 iopscience.iop.org/article/10.1...
The work awaiting endorsement or arXiv.org: : "When the Code Is Invisible: Self-Referential Quantum Error Correction, a Corrected Axiom, and a Two-Threshold Structure in Empirical Consciousness Measures". Please help me publish my paper.
#science #physics #quantummechanics #quantumerrorcorrection
QuSynth combines reinforcement learning & Monte Carlo tree search to synthesize stabilizer states for a 144-qubit gross code, reducing two-qubit gate counts by up to 2.5x — breaking the prior ~20-qubit synthesis barrier.
#QuantumErrorCorrection #QuantumCircuitSynthesis #News
New joint decoding+sensing framework infers quasiparticle density from syndrome data alone, reducing logical error probability 1.5–4× over uniform-prior baselines for surface and bivariate bicycle qLDPC codes under cosmic-ray noise.
#QuantumErrorCorrection #FaultTolerantQuantumComputing #Research
Alice & Bob cut QEC decoding simulation time from 18h to ~2h (9.25x speedup) using NVIDIA CUDA-Q on a GH200 GPU vs AMD Ryzen 9950X CPU, with no loss in logical error accuracy. Tested on 'Elevator Codes' for cat qubits across 100K shots.
#QuantumErrorCorrection #CUDAQ #News
🙌 Want some hands-on #QEC experience?
Last month, the ‘Riverlane #QuantumErrorCorrection Distance-3 Surface Experiment Workshop’ was hosted by the QSC at Oak Ridge National Lab with our partners IQM
Find out more: www.riverlane.com/blog/running... — & get in touch if you want to host a workshop!
New SDP-based framework links mixed-unitarity of unital quantum channels to quantum memory in non-Markovian dynamics. Outperforms existing witnesses for qutrit/ququart channels, with direct implications for noise mitigation in quantum computing.
#QuantumComputing #QuantumErrorCorrection #Research
Quantum Machines' Open Acceleration Stack enables microsecond-latency CPU/GPU/FPGA integration with QPUs via OPNIC and NVIDIA NVQLink, supporting real-time QEC and AI-native qubit calibration at scale.
#HybridQuantumComputing #QuantumErrorCorrection #News
IQM's 20-qubit superconducting QPU + Zurich Instruments ZQCS + NVIDIA NVQLink achieve <4µs end-to-end latency for real-time syndrome decoding via GPU-accelerated CUDA-Q, targeting logical qubit error rates of 10⁻⁵–10⁻⁶.
#QuantumErrorCorrection #QuantumComputing #News
IQM's 20-qubit superconducting QPU, Zurich Instruments' ZQCS, and NVIDIA's NVQLink platform are being integrated into a closed-loop QEC demonstrator targeting low-latency logical qubit operation for enterprise datacenter deployment by 2030.
#QuantumErrorCorrection #FaultTolerantQuantum #News
Princeton researchers introduce 'scalable postselection' using a partial gap metric to reduce quantum error correction overhead by 4x per logical gate, validated on surface and repetition codes via stabilizer simulation.
#QuantumErrorCorrection #FaultTolerantQuantumComputing #Research
Utsumi & Nakata construct two explicit quantum decoders using QSVT-based fixed-point amplitude amplification, achieving near-capacity rates for any noisy channel in both entanglement-assisted and non-assisted settings with reduced circuit complexity.
#QuantumErrorCorrection #QSVT #News
Researchers generalize quantum LDPC codes from qubits to qudits, presenting a unified framework covering bivariate bicycle, hypergraph product, SHYPS, expander, and fiber bundle codes—identifying novel qudit codes compatible with near-term hardware.
#QuantumErrorCorrection #Qudits #QLDPC
