A quantum computer on your desk: 35 qubits on an ordinary PC.

3 November 2026 · Coolblack GmbH

Something that normally takes a server with a huge amount of memory, Coolblack has done on a single PC: its quantum simulator Qubitwerk has fully computed a 35-qubit circuit. Anyone can try it for free at qubitwerk.com.

35 qubits on one PC
A quantum computer calculates with qubits. To recompute them exactly on an ordinary computer, every additional qubit doubles the memory needed. For 35 qubits that means more than 34 billion complex numbers and 512 GiB, far more than fits into a PC’s memory.
On 20 September 2026, Qubitwerk therefore streamed this state block by block from the SSD to an off-the-shelf NVIDIA RTX 3090 graphics card and computed it there. The run took 10.8 hours, in double precision.

About twice as fast in testing
The simulator is also getting faster. In a test series on 31 October 2026 with twelve mixed jobs from 12 to 28 qubits, a new Qubitwerk prototype took 12.23 seconds. The established software Qiskit Aer needed 24.58 seconds on the same PC. All 108 result comparisons passed the accuracy limits set in advance.

“Already today on an ordinary computer”
“Quantum computers sound like the future and big science. We want to show how much of it you can already understand and try out on a perfectly ordinary computer today,” says Dirk Nesner, Managing Director of Coolblack GmbH.

Try it yourself
On qubitwerk.com, visitors set their own test code on a virtual combination lock, and the simulator searches for it with Grover’s quantum search among ten million possibilities, or even a hundred million. There is also a playground for building quantum circuits, a simulated diamond qubit and explainer pages such as “What is a quantum computer?”. For schools, Coolblack is developing a free iPad app that brings the topic to life in a single lesson.

Press contact: Dirk Nesner · Coolblack GmbH · Südfeldwiese 14, 32107 Bad Salzuflen, Germany · Phone +49 5222 917 90 917 · nesner@coolblack.gmbh
https://qubitwerk.com · https://qubitwerk.com/en/research