Quantum-Ready. Human-Led.

From Nobel Prize research to enterprise security solutions, meet the team advancing secure communication.

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We merge decades of academic excellence with deep product and engineering expertise.

Our Experienced Team

Founders & CEO

Felix Tiefenbacher &
Rupert Ursin

Our experienced leadership

Founders & CEO

Felix Tiefenbacher
Felix has been CEO & Founder of HELIOVIS, building solar tech over 15 years. Earlier, he led a quantum cryptography startup with Nobel laureate Prof. Zeilinger and was a postdoc at IQOQI Vienna.

Founders & CEO

Rupert Ursin
Rupert is a leading quantum scientist and CEO & Founder of qtlabs, focused on space-based quantum communication. He was also Senior Group Leader and Deputy Director at IQOQI Vienna, driving global quantum research.

Founder Senior Advisor

Thomas Scheidl
Thomas is a quantum scientist with a strong research record. As CEO & Founder of qtlabs, he worked with Rupert on quantum systems. Earlier, he spent 8 years at IQOQI and contributed to the Quantum Experiments at Space Scale project.

Head of Prod. Development & Production, Founder

Thomas Heine
Thomas is an engineering and manufacturing expert with 9 years leading R&D and production at XARION, and 11 years at TOPTICA developing miniaturized lasers for quantum tech.

CFO

Christoph Thaler
Christoph is a corporate finance expert with M&A and CFO experience. He advised private equity and tech firms, holds a master’s in international business, and is a CFA charterholder.

Head of Sales

Lukas Helm
Lukas is Head of Sales at the company, driving business growth and partnerships. With a strong background in tech sales and customer relations, he plays a key role in expanding market presence and strategic outreach.

Lookout

“When it comes to Quantum Tech, the guys from Vienna have been world leaders in research for years and now have a realistic chance of becoming one of the world market leaders in production and sales. Only then will you transfer data securely, even against future generations of hackers with access to unlimited resources.”
A portrait of the advisory board member Hanns Ametsreiter

Advisory Board Member

Hannes Ametsreiter
“Quantum technology and deriving processing power will be a huge challenge for existing security, encryption and communication systems. The company 'Quantum Industries' with their unique technology will protect against these threats and make sure to lift security of communication and data exchange to the highest possible level for industry, politics and business.”
A portrait of the advisory board member Christian Federspiel

Advisory Board Member

Christian Federspiel
Elevate Your Security Posture Beyond the Quantum Threshold.
Whether you’re planning a secure network or exploring integration—our team is ready to protect your most valuable assets.
Get in contact with our Tech team to receive more details
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Quantum Security,

Now and Forever.
Copyright © 2025 zerothird

Team

World-Class Science.
Real-World Solutions.
zerothird was founded by scientists and engineers behind some of the most impactful quantum experiments in the world—with our founders serving as core members of Dr. Anton Zeilinger's Nobel Prize-winning laboratory.

Our team merges decades of academic excellence with deep product and engineering expertise. This unique convergence of scientific rigor and practical implementation experience enables us to deliver quantum security solutions that are simultaneously at the cutting edge of physics and designed for real-world deployment. From our Vienna headquarters, we're expanding quantum security across Europe and beyond.