Quantum Ledger
Vol. III·Library·Papers
A working bibliography · curated, not exhaustive
Boulder · Colorado
updated weekly

Papers we read

The science behind the Brief. We do not aim to be exhaustive — we aim to name the load-bearing papers a sector reader should be able to discuss.

12 of 12 matching

The reading list

  1. 01
    Quantinuum (Helios team)·Mar 2026·arXiv 2603.01421high

    Below-threshold logical operation with multi-zone QCCD at AQ 64

    First public demonstration of multi-zone QCCD running below the surface-code threshold at #AQ 64 with statistically meaningful logical-error scaling. The strongest single experimental result of the cycle.

    Error Correction·arXiv:2603.01421
  2. 02
    QuEra · Harvard·Feb 2026·Naturehigh

    Algorithmic fault tolerance with neutral-atom Rydberg arrays

    Below-threshold 4-round logical circuits on a multi-hundred-atom Rydberg system; the breakthrough that lifted QuEra into the DARPA Stage B "high" odds tier.

  3. 03
    Photonic Inc.·Jan 2026·Nature Nanotechnologymedium

    Three-qubit silicon T-centre register with photonic interconnect

    First three-qubit silicon T-centre register operating at telecom wavelengths. Distributed quantum becomes credible as a near-term scaling path.

  4. 04
    Diraq · IMEC·Sep 2025·Naturehigh

    Foundry-fabricated silicon CMOS spin qubits with >99% two-qubit fidelity

    The first credible demonstration that >99% two-qubit fidelity can be obtained on foundry-fabricated CMOS spin qubits. Makes the longer-cycle silicon thesis real.

  5. 05
    IonQ·Aug 2025·arXiv 2508.04321medium

    Mølmer–Sørensen gates at 99.99% two-qubit fidelity on a Forte-class system

    World-record two-qubit gate fidelity on a commercially deployed ion-trap system. Anchor result for the AQ 64 milestone.

  6. 06
    PsiQuantum·Jul 2025·arXiv 2507.11982high

    Active-volume photonic fault tolerance at the Omega chipset scale

    Manufacturable photonic FTQC architecture at million-qubit scale; the engineering paper that underpins the IQMP build-out.

    Error Correction·arXiv:2507.11982
  7. 07
    IBM Quantum·May 2025·arXiv 2505.06241medium

    Heron-r2 + Eagle modular interconnect: a two-chip 256-qubit demonstration

    Modular interconnect operating between two Heron-class processors. Sets the engineering anchor for the 2029 Apollo roadmap.

  8. 08
    NIST·Dec 2024·NIST FIPSfoundational

    FIPS 203, 204, 205 — final post-quantum cryptographic standards

    The post-quantum standards on which the rest of the decade’s cryptography migration is built. The most-cited document in the cohort’s policy reading.

    Cryptography
  9. 09
    Google Quantum AI·Aug 2024·Naturefoundational

    Below-threshold error correction with surface codes on Willow

    First demonstration of exponentially suppressed logical error with surface codes at distance 7 — the proof that scaling error correction is no longer hypothetical.

  10. 10
    DARPA QBI·Jun 2024·DARPA-PA-24-04foundational

    Independent verification & validation framework for utility-scale quantum

    DARPA's own framework for IV&V across QBI performers. The single best public statement of how the sovereign technical buyer is reading the cohort.

    Survey
  11. 11
    Quantinuum (Bombín et al.)·Mar 2023·Naturefoundational

    Demonstration of a fault-tolerant logical CCZ on QCCD ions

    One of the foundational error-corrected logical-gate experiments of the modern era. Still cited in every Stage B roadmap document.

  12. 12
    Arute et al. (Google)·Oct 2019·Naturefoundational

    Quantum supremacy using a programmable superconducting processor

    The "supremacy" paper. The mark in the calendar that anchored modern quantum hardware reporting; subsequent classical recreations narrowed the gap but did not retract the claim.

A bibliography is opinionated by definition — what gets in, in what order, and how it is described. We treat these choices as editorial, not technical.