Joe Fitzsimons

Joe Fitzsimons

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Physicist and CEO of Horizon Quantum Computing; building tools to make quantum programming more accessible and user-friendly.

Integrating IonQ 256‑Qubit System to Boost Quantum Advantage
SocialApr 9, 2026

Integrating IonQ 256‑Qubit System to Boost Quantum Advantage

We're pushing forward with our effort to unlock broad quantum advantage by adding a frontier system to our testbed: @IonQ_Inc 's next-gen 256 qubit system, which is expected to have more nines of fidelity than you can shake a stick...

By Joe Fitzsimons
Early Quantum Algorithms Underestimated; Factoring Progress Sparks Optimism
SocialMar 31, 2026

Early Quantum Algorithms Underestimated; Factoring Progress Sparks Optimism

One of the reasons I am so optimistic about broad quantum advantage is how far from optimal early quantum algorithms and fault-tolerance schemes have turned out to be. The recent progress on factoring, including today's results, is astounding.

By Joe Fitzsimons
Company Launches Nasdaq Debut as $HQ Tomorrow
SocialMar 19, 2026

Company Launches Nasdaq Debut as $HQ Tomorrow

Delighted to be able to share that we expect to begin trading on Nasdaq tomorrow as $HQ. After 7 years of work, it’s great to finally reach the starting line. $DMYY https://t.co/9tJ8iMXemJ

By Joe Fitzsimons
Horizon Quantum to Discuss IPO Journey on March 9
SocialMar 9, 2026

Horizon Quantum to Discuss IPO Journey on March 9

$DMYY $HQ Looking forward to joining the IPO Edge fireside chat this Monday, March 9 at 1:15pm ET, alongside Harry You and Greg Gould, our CFO, to discuss Horizon Quantum’s current journey to becoming a public company. https://t.co/F5hYGF2BTl

By Joe Fitzsimons