The money and the code are in different places.
Forty quantum companies have each raised $100M or more, about $27.3B in total as of 9 Nov 2026. IonQ alone has raised $6.1B, more than the next two combined. But funding is a poor guide to where a developer can actually contribute. Twenty of the 45 independent companies here publish no SDK at all. Even IonQ, the best-funded of them, keeps its main integrations inside Qiskit and Cirq.
For this guide I checked 106 of these companies’ GitHub repos on 10 Nov 2026:
My take: if you want to break into quantum as a developer, ignore the funding league table. Start with PennyLane (Xanadu), Ocean (D-Wave), Bloqade (QuEra), TKET and Guppy (Quantinuum), or Deltakit (Riverlane).
$120M
Below, each of the 50 companies gets its funding, focus, moat, links and the exact repos to start with. That covers the 40 that raised $100M+, five smaller companies with notable technology, and IBM, Google, Microsoft, AWS and NVIDIA. Python gets you into most SDKs. Rust and C++ are scarce and valued in compilers and simulators, and FPGA engineers are wanted in control systems and decoders.
How the companies were ranked and their GitHub checked
Companies are ranked by total capital raised. The five big-tech programs come last, since they don’t raise money separately for quantum.
Some companies are quantum-adjacent rather than quantum computing: post-quantum crypto chips, QKD, lasers and sensing. They’re included because they raised $100M+ on quantum businesses, and they’re flagged. Each profile ends with Links and, where one exists, Programs. A missing X handle means it couldn’t be verified, not that the company has none.
Funding doesn’t predict an open door.
The 45 independent companies, placed by capital raised. Companies with no public SDK sit across the whole range, up to $1.7B.
Every company, and the exact repo to start with.
Open any row for funding, focus, moat, and where to land your first PR. Filter by what you can already write.
Trapped-ion and neutral-atom hardware
11 COMPANIESIons and atoms hold today's fidelity and logical-qubit records, and they've drawn about $12B of the capital. Quantinuum, Pasqal and QuEra have the deepest open-source surfaces. IonQ's integrations live mostly inside Qiskit and Cirq.
Superconducting, photonic, spin and annealing hardware
21 COMPANIESThis is the most crowded part of the map, with 21 companies. It also has the two best contribution targets of any hardware startup: Xanadu's PennyLane and D-Wave's Ocean. Silicon-spin companies are the least open, and none of the five has a real SDK yet.
Software, control, error correction and quantum-adjacent
13 COMPANIESThe picks-and-shovels layer is where non-physicists add value fastest. Control stacks, QEC decoders and synthesis compilers sell to every hardware maker, whichever qubit wins. Riverlane, Quantum Machines and Classiq run the most welcoming repos here. Five companies in this group are quantum-adjacent (security, lasers, sensing) and are marked as such.
Big-tech quantum stacks: IBM, Google, Microsoft, AWS and NVIDIA
5 COMPANIESThe five big-tech programs raise no outside money for quantum, but they run the largest and most active open-source codebases. Every repo below had a commit in the last two weeks, except cuQuantum (Sep 2026) and Microsoft's archived katas. Expect a CLA or a sign-off rule, plus CI that is strict but well documented.
Pick the repo that matches the skill you already have.
Land one docs or test PR, then use a bounty, grant or free-credit program to go deeper.
Quantum hackathons, grants and free credits in 2026
The unitaryHACK bounty list and the Deltakit fund are the most direct ways to get paid for open-source quantum work.