Oratomic Raises $475M Series B at Reported $5.4B Valuation to Build a 10,000-Qubit Fault-Tolerant Quantum Computer

Oratomic Lands a $475 Million Series B

On October 8, 2026, quantum computing startup Oratomic announced a $475 million Series B round. The raise brings the company's total funding to date to $775 million.

The new round arrived about three months after Oratomic's $300 million Series A, which closed in July 2026. According to Dealroom, it is the largest US Series B ever raised in quantum technologies, topping all 62 such rounds on record.

A Roster of Heavyweight Investors

Six firms co-led the Series B:

• ARCH Venture Partners
• Spark Capital
• Khosla Ventures
• Index Ventures
• General Catalyst
• Bezos Expeditions

Valuation Reportedly Jumps to $5.4 Billion

Press reports put Oratomic's valuation after the round at $5.4 billion, up from $1.5 billion after its Series A. That increase came within roughly three months.

The figure is not official. Oratomic did not disclose its valuation, and reported numbers range from $5.4 billion to $5.5 billion.

The 10,000-Qubit Bet

Oratomic's central claim is that a useful fault-tolerant quantum computer needs only about 10,000 qubits. One source puts the figure at 10,000 to 20,000 reconfigurable neutral-atom qubits.

That is far below earlier industry consensus and the targets of rival approaches, which call for about one million qubits or more. If Oratomic is right, the hardware needed for practical, error-corrected quantum computing would be much smaller than widely assumed.

How Reconfigurable Neutral Atoms Cut the Qubit Count

Oratomic's qubits are neutral atoms held in place by laser optical tweezers. These atoms can be rearranged in the middle of a computation.

The company says this flexibility lets each atom have more error-correction connections. With more connections per atom, fewer qubits are needed overall to reach fault tolerance.

The Team Behind Oratomic

Oratomic is based in Pasadena, California. It was founded in 2025 and came out of stealth in March 2026. Its founding team and advisors have deep roots in academic neutral-atom research:

• Dolev Bluvstein, CEO and co-founder, comes from Harvard's Lukin group.
• Manuel Endres, co-founder and Caltech professor, has trapped arrays of about 6,000 atoms.
• John Preskill serves as an advisor.

Where the Money Goes and the 2030 Target

Oratomic says the new capital will fund:

• Growth of its scientific and engineering team
• Laboratory infrastructure
• The systems needed to build its quantum computers

Bluvstein expects the computer to be ready by 2030. With $775 million raised so far, Oratomic now has substantial resources to test whether its 10,000-qubit approach can deliver on that timeline.