Enabling a new generation of Quantum Technologies

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Our Approach to Scalable Quantum Computing

Covara is a quantum computing company developing scalable, flexible, and practical architectures.

We specialize in continuous-variable, measurement-based quantum computing, operating entirely in the microwave domain to avoid the complexity of photonic systems or superconducting qubits.

Our technology generates large-scale cluster states with minimal hardware. With just two cables, we have achieved record-breaking entanglement of 94 modes, enabling precise phase control and seamless integration, all from a compact, programmable source.

We call it the Cluster State in a Box: a plug-and-play quantum resource designed to accelerate progress in quantum communication, sensing, and computation.

Designed for a Quantum Future

Covara unlocks scalable, programmable quantum systems ready for real-world impact.

Up to

entangled modes
AND THAT’S JUST THE BEGINNING!

Entangling 90+ modes with the same simple setup. Others scale in complexity, we don’t.

Truly Scalable‎ ‎ ‎ ‎ ‎

One Device
Many Applications

No optical mess

Forget complex optical tables and phase stabilization,

we do it with two cables.

Built for Researchers

Built for Researchers

Publication

Continuous-Variable Square-Ladder Cluster States in a Microwave Frequency Comb

We generated three independent square-ladder continuous-variable cluster states with up to 94 qumodes using a microwave frequency comb. The states were verified via up to 1.4 dB of nullifier squeezing and 5.42 dB of two-mode squeezing.

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Publication

Control of multi-modal scattering in a microwave frequency comb

We demonstrate precise control over a 95-mode microwave frequency comb, creating square-ladder correlation graphs via phase-tuned multi-pump driving of a Josephson parametric oscillator. Our digitally controlled method matches theoretical predictions and scales easily to more modes and topologies.

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Publication

Multipartite entaglement in a microwave frequency comb

We demonstrate multipartite entanglement in a microwave frequency comb with 64 correlated modes using a bichromatically pumped Josephson parametric amplifier. A subset of seven modes shows full inseparability, and the method is scalable to even larger systems.

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Publication

Non-reciprocical Scattering in a Microwave Frequency Comb

We demonstrate non-reciprocal scattering in a microwave frequency comb by tuning the pump parameters of a Josephson parametric oscillator, enabling two-mode isolation and three-mode circulation. Our results match theory and open new paths for engineered quantum correlations.

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Quick answers to Big Questions

Quantum is not always intuitive. We’re here to make it clearer.

What is continuous-variable measurement-based quantum computing?

Continuous-variable quantum computing is an alternative to the more common qubit-based approach. Instead of using discrete states like 0 and 1, we use qumodes, which encode information in the amplitude and phase of electromagnetic waves. This allows us to access a much larger Hilbert space with fewer physical components. By operating in this continuous domain, we can design systems that are more scalable, efficient, and compatible with existing technologies.

How is Covara’s technology different from other quantum computing approaches?

Unlike most companies working with superconducting qubits or photonic chips, Covara operates in the microwave domain using continuous variables. This enables high scalability, precise digital phase control, and minimal hardware complexity, with thousands of modes managed through just two cables.

What is a “Cluster State in a Box”?

It’s our plug-and-play quantum resource: a compact, programmable device that outputs continuous-variable cluster states. This product can serve as the foundation for a wide range of quantum technologies, including communication, sensing, and computation.

Why is scalability such a big issue in quantum computing, and how are you solving it?

Current systems face major challenges in scaling due to hardware complexity, interconnect requirements, and limited entanglement range. Our architecture reduces this overhead by using a single circuit and continuous-variable modes, enabling more qumodes in less space with better coherence.

What stage is the technology currently at?

We have demonstrated 94 entangled modes with one dB of squeezing, a record-breaking result. Our next steps include optimizing the hardware, increasing squeezing levels, and developing the first version of the “Cluster State in a Box.”

Is Covara’s platform suitable for universal quantum computing?

Yes, and that is our goal. While current implementations focus on generating large-scale cluster states, we are working on integrating non-Gaussian resources, which are essential for universal quantum computing.

How can I collaborate or support Covara Quantum?

We’re always open to strategic partnerships, research collaborations, and investment opportunities. If you’re interested in working with us, reach out via info@covara.se

Where is Covara Quantum based, and how can I get in touch?

Covara Quantum is based in Sweden. You can reach us directly at info@covara.se or through the contact form on our website. We’re happy to hear from researchers, companies, or curious minds interested in the future of quantum technologies.