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Quantum Computing Qubit Counts: 2026 Status Report

A simple guide to understanding where quantum computers are today and when they might break cryptocurrency encryption

What Are Qubits?

Think of qubits as the "bits" of quantum computers, but much more powerful and fragile:

Physical Qubits (Noisy Qubits)

The actual hardware qubits. They make errors frequently - like typing on a keyboard where 1 in 100 keys presses the wrong letter.

Logical Qubits (Error-Corrected Qubits)

Groups of physical qubits working together to create one reliable qubit. It takes hundreds or thousands of physical qubits to make one logical qubit that actually works reliably.

The Goal: To break Bitcoin or Ethereum encryption with a practical runtime (~2 hours), you need about 6,500 logical qubits, which translates to roughly 8 million physical qubits using traditional surface codes. However, new QLDPC-based architectures (Iceberg Quantum, February 2026) have shown that RSA-2048 can be broken with under 100,000 physical qubits — a 10x reduction. If similar techniques apply to ECDSA, the Bitcoin threshold could be much lower than previously assumed. The often-cited "~2,330 logical qubits" figure is the theoretical minimum-width design with an impractically long runtime.

Current Quantum Computing Status by Company

IBM

Roadmap

Technology: Superconducting

Physical Qubits: 156 (Heron R2)

Logical Qubits: 1-2 / 200

Target Year: 2029

Achievement: 50x faster operations. Starling system: 200 logical qubits, 100M error-corrected operations. Blue Jay: 2,000 logical qubits by 2033. System Two deployed.

Google

Willow Chip

Technology: Superconducting

Physical Qubits: 105 (Willow)

Logical Qubits: Below-threshold demo / 100+

Target Year: 2028-29

Achievement: First to prove error correction scales (Dec 2024). Exponential error reduction from distance-3 to distance-7. RL-powered self-calibration (3.5x error rate improvement).

IonQ

Roadmap

Technology: Trapped Ion

Physical Qubits: 36 (Forte), 256 planned 2026

Logical Qubits: 0 / 1,600 (2028), 2M physical (2030)

Target Year: 2028-30

Achievement: 99.99% two-qubit gate fidelity (world record, Oct 2025). EQC technology (electronics, not lasers) from Oxford Ionics acquisition. Works above Doppler limit. Beam Search decoder: 17x error reduction, <1ms on CPU. 256-qubit system at 99.99% fidelity planned 2026. Acquired Skyloom (space networking). Physical-to-logical ratio as low as 13:1 at this fidelity.

Quantinuum

Website

Technology: Trapped Ion

Physical Qubits: 98 (Helios)

Logical Qubits: 48 (distance-2, detection only) / Hundreds

Target Year: 2030 (Apollo)

Achievement: Highest quality deployed system. 99.921% two-qubit fidelity (industry best for deployed systems). QV >2 million. 48 logical qubits via Iceberg code at 2:1 ratio (error detection, not correction). $20B+ IPO filed Jan 2026.

USTC (China)

PRL

Technology: Superconducting

Physical Qubits: 107 (Zuchongzhi 3.2)

Logical Qubits: Below-threshold demo / Scaling

Target Year: Matching Google

Achievement: Fourth team worldwide to achieve below-threshold QEC (Dec 2025). First outside the US. Error suppression factor 1.40, distance-7 surface code. All-microwave leakage suppression (72x reduction).

Infleqtion

Website

Technology: Neutral Atom

Physical Qubits: 1,600 (Sqale)

Logical Qubits: 12 (error detection + loss correction) / 30 (2026), 1,000 (2030)

Target Year: 2026-30

Achievement: 99.5% two-qubit gate fidelity. 1,600 atoms (commercial neutral atom record). First execution of Shor's algorithm on logical qubits (Sep 2025). 12 logical qubits demonstrated. Going public NYSE:INFQ. NVIDIA NVQLink integration. $50M Illinois quantum center partnership.

Atom Computing

Website

Technology: Neutral Atom

Physical Qubits: 1,180 (Gen 1)

Logical Qubits: Developing / 100+

Target Year: 2027-28

Achievement: 99.6% two-qubit gate fidelity. Room-temperature operation. Microsoft partnership for fault-tolerant quantum computing. Scaling to 100,000 atoms in coming years.

QuEra

Website

Technology: Neutral Atom

Physical Qubits: 260 (Gemini), 448 (demo)

Logical Qubits: R&D / 10-100

Target Year: 2027-28

Achievement: 99.5% two-qubit gate fidelity. Harvard/MIT collaboration. 448-atom fault-tolerant architecture with 2.14x below-threshold QEC (Nov 2025, Nature). Delivered error-correction-ready machine to AIST Japan.

Pasqal

Website

Technology: Neutral Atom

Physical Qubits: 1,000 to 10,000 (2026)

Logical Qubits: In dev / Scalable

Target Year: 2026-28

Achievement: Aggressive scaling: 10,000 physical qubits by 2026. European quantum leader. Focus on optimization and simulation.

Rigetti

Website

Technology: Superconducting

Physical Qubits: 84 (Ankaa-3)

Logical Qubits: In dev / 100+

Target Year: 2028-30

Achievement: 99.5% two-qubit fidelity. Modular architecture. Plans: 1,000+ physical by 2026, 100,000 logical by 2030.

PsiQuantum

Website

Technology: Photonic

Physical Qubits: Development phase

Logical Qubits: 0 / 100+

Target Year: 2027-28

Achievement: Most ambitious: 1M+ physical photonic qubits by 2027-28. Room temp. Uses semiconductor fabs (GlobalFoundries). $1B+ Series E. AMD/Xilinx veteran Victor Peng appointed CEO (Feb 2026) for deployment phase. Sites in Australia and Chicago.

Microsoft

Azure Quantum

Technology: Topological

Physical Qubits: Majorana 1 prototype

Logical Qubits: R&D phase / TBD

Target Year: Years not decades

Achievement: First Majorana qubit readout demonstrated (QuTech, Feb 2026, Nature): single-shot parity measurement via quantum capacitance with >1ms coherence. First topological materials demo (Feb 2025). Could need fewer physical qubits if proven. Hedging with IonQ, Quantinuum, Atom Computing partnerships.

D-Wave

Website

Technology: Hybrid (Annealing + Gate-Model)

Physical Qubits: 5,000+ (annealing)

Logical Qubits: N/A (annealing), Gate-model in dev

Target Year: 2026 gate-model

Achievement: Acquired Quantum Circuits Inc. for $550M (Jan 2026). Industry-first on-chip cryogenic control. Dual-rail gate-model system planned for 2026. Annealing systems cannot break encryption.

Oxford Ionics

Website

Technology: Trapped Ion

Physical Qubits: R&D prototypes

Logical Qubits: N/A (acquired by IonQ)

Target Year: Merged 2025

Achievement: Previous 99.99% world record holder. Electronic qubit control tech now part of IonQ stack.

blueqat

EE Times

Technology: Silicon (Semiconductor)

Physical Qubits: Desktop prototype

Logical Qubits: Early stage

Target Year: 2030: 100 qubits

Achievement: Desktop-scale silicon quantum computer at $670K. Leverages existing semiconductor fabs (Moore's Law economics). Displayed at CES-adjacent event Jan 2026.

Equal1

TQI

Technology: Silicon (CMOS)

Physical Qubits: Bell-1 (shipping)

Logical Qubits: Early stage

Target Year: Scaling

Achievement: $60M raised Jan 2026. Rack-mounted, datacenter-ready. No dilution refrigerator required. Already shipping to ESA Space HPC Centre. Standard semiconductor manufacturing.

SQC

Nature

Technology: Silicon (Atom)

Physical Qubits: 11

Logical Qubits: R&D / Scaling

Target Year: 2030+

Achievement: 99.99% single-qubit and 99.90% two-qubit gate fidelity in silicon (Dec 2025, Nature). 660ms coherence times. Leverages semiconductor fabrication.

Technology Type Explanations

Superconducting

Ultra-cold circuits (colder than space). Fast gate operations (20-100 nanoseconds) but need extreme cooling in dilution refrigerators. Dominant architecture: IBM, Google, USTC.

Trapped Ion

Individual atoms held by electromagnetic fields and controlled with lasers. Very accurate (best gate fidelities) but slower operations (1-100 microseconds). Leaders: IonQ, Quantinuum.

Neutral Atom

Arrays of atoms in optical tweezers (focused laser beams). Highly scalable (6,100-qubit record set by Caltech, Sep 2025). Can operate at higher temperatures than superconducting. Leaders: Atom Computing, QuEra, Pasqal.

Photonic

Uses particles of light (photons). Room temperature potential, compatible with standard chip fabrication. Enables networking between quantum computers. Leaders: PsiQuantum, Xanadu.

Topological

Theoretical approach where qubits are inherently protected from errors by their physical structure. Potentially needs far fewer physical qubits per logical qubit. Microsoft is the main proponent; still early-stage.

Silicon / Semiconductor

Qubits built on standard silicon chips using existing semiconductor manufacturing. Potential for Moore's Law-style scaling and cost reduction. Leaders: blueqat, Equal1, SQC, Intel.

Quantum Annealing

Specialized for optimization problems only. Not universal quantum computing. Cannot run Shor's algorithm, so cannot break encryption. D-Wave is transitioning to also include gate-model computing.

Definitions and Terminology

TermSimple Explanation
Physical QubitsThe actual hardware qubits. Error-prone (like a keyboard where 1 in 100 keys fail).
Logical QubitsError-corrected qubits made from hundreds to thousands of physical qubits working together. The kind needed to run Shor's algorithm.
Below ThresholdCritical milestone where adding MORE qubits REDUCES errors. Google Willow achieved this in Dec 2024. Three more teams have since confirmed it (Quantinuum, Harvard/QuEra, USTC).
FTQC (Fault-Tolerant Quantum Computing)Quantum computers that can run indefinitely without errors accumulating. The end goal for cryptanalysis.
Gate FidelityAccuracy of quantum operations. 99.9%+ ("three nines" or better) is the threshold for practical error correction. Current best: 99.99% (IonQ EQC, lab prototype). Best deployed: 99.921% (Quantinuum Helios).
CRQCCryptographically Relevant Quantum Computer - powerful enough to run Shor's algorithm and break ECDSA/RSA encryption. None exist yet.
Surface CodeThe most common error correction technique. Arranges physical qubits in a 2D grid. Each patch of qubits forms one logical qubit. Higher "distance" (larger patches) means lower error rates.
QLDPC CodesQuantum Low-Density Parity-Check codes. A newer class of error correction that encodes many logical qubits per code block with far less overhead than surface codes (e.g., 14 logical qubits in ~860 physical qubits vs. 1 logical qubit in ~511 for surface code at distance 16). Requires non-local connectivity but reduces total physical qubit requirements by ~10x.
Lattice SurgeryThe fundamental operation for computation on surface codes. Splits, merges, and manipulates logical qubits. First demonstrated on superconducting qubits by ETH Zurich in Feb 2026.
Quantum Volume (QV)A holistic performance measure that combines qubit count, quality, connectivity, and error rates into a single number. Quantinuum Helios currently holds the record at QV >2 million.
ECDSA / secp256k1The digital signature algorithm and specific curve used by Bitcoin and Ethereum. Vulnerable to Shor's algorithm on a sufficiently powerful quantum computer.
Shor's AlgorithmA quantum algorithm that breaks RSA and ECDSA by solving factoring and discrete logarithm problems exponentially faster than any classical computer.
HNDLHarvest Now, Decrypt Later. Adversaries store encrypted data today for future quantum decryption. The Federal Reserve has confirmed this is actively happening to blockchain data.
PQCPost-Quantum Cryptography. New algorithms designed to resist both classical and quantum attacks. NIST standardized three in August 2024: ML-KEM, ML-DSA, SLH-DSA.

Data Sources

  • Company roadmaps and official announcements (IBM, Google, IonQ, Quantinuum, Infleqtion, D-Wave, PsiQuantum, etc.)
  • Nature journal publications (Google Willow, Harvard/MIT/QuEra, USTC Zuchongzhi 3.2, SQC silicon qubits, Stanford cavity arrays, QuTech Majorana readout)
  • Nature Electronics publications (QuTech QARPET crossbar chip)
  • Nature Physics publications (ETH Zurich lattice surgery, Tokyo constant-overhead QEC)
  • ePrint / arXiv preprints (Kim et al. 2026/106, Iceberg Quantum Pinnacle Architecture 2602.11457, IonQ Beam Search decoder, Shor's reliability enhancement)
  • The Quantum Insider industry analysis
  • Riverlane QEC Report 2025 (120 papers, 25 experts including Nobel laureate John Martinis)
  • NIST post-quantum cryptography standards (FIPS 203-205)
  • a16z crypto quantum computing analysis (December 2025)
  • Federal Reserve HNDL study (October 2025)

Last Updated: February 16, 2026