Full Stack

PsiQuantum

Photonic Private Private Palo Alto, CA, USA
Founded 2016 psiquantum.com ↗

Overview

PsiQuantum is a private, Palo Alto-based quantum computing company founded in 2016 with a singular, high-conviction thesis: the only viable path to commercially useful quantum computing runs through fault-tolerant systems built on photonic qubits manufactured in existing, high-volume semiconductor fabs. The company does not offer a near-term NISQ product; it is explicitly building toward a utility-scale machine requiring approximately one million physical qubits, and it has declined to pursue interim revenue-generating products that would distract from that goal. This is a long-duration, high-capital-intensity bet that more closely resembles semiconductor infrastructure investment than conventional enterprise software or even most quantum hardware companies.

The core technical thesis rests on three pillars: photons are naturally error-resistant (they do not require millikelvin cooling and do not decohere from thermal noise the way superconducting qubits do), silicon photonics is a mature process node already in high-volume production at foundries like GlobalFoundries and SkyWater, and fault-tolerant quantum computing via photonic cluster-state architectures — specifically, measurement-based quantum computing using linear optical elements and photon-number-resolving detectors — can be scaled using standard CMOS-compatible fabrication. PsiQuantum's founders, including CEO Jeremy O'Brien, a leading photonic quantum computing researcher, staked the company on the insight that qubit quality at scale is determined by fab process control, not laboratory tinkering, and that partnering with commercial fabs is therefore strategically superior to building bespoke cryogenic hardware.

Commercially, PsiQuantum has no revenue-generating product today. Its strategy is to reach fault-tolerant operation before competitors, at which point it expects to address high-value applications in pharmaceuticals, financial modeling, logistics optimization, and — increasingly relevant — cryptography. Its partnership with GlobalFoundries for chip fabrication and its construction of a dedicated facility, Quantum Shore, in Moreton Bay, Australia (with substantial Australian government backing), represent its two primary infrastructure pillars outside the U.S. The Australian facility broke ground in June 2026 and is intended to house early utility-scale hardware.

In the competitive landscape, PsiQuantum occupies a unique and somewhat lonely position: it is the best-capitalized pure-play photonic quantum hardware company by a wide margin, but it is also the most capital-intensive and the furthest from a demonstrable intermediate product. Its most direct architectural competitors are academic groups and early-stage startups rather than the better-known superconducting (IBM, Google) or trapped-ion (IonQ, Quantinuum) players. However, the emergence of Oratomic in mid-2026 — claiming fault tolerance at only ~20,000 physical qubits using neutral atoms — introduces a credible architectural alternative that, if validated, would substantially undercut PsiQuantum's qubit-count premise. U.S. government confidence in the company's approach is now unambiguous: PsiQuantum received a $125M DARPA contract in July 2026 and a $100M CHIPS Act Commerce Department award finalized in September 2026, supplementing a landmark $1B private round in June 2026 led by BlackRock, NVIDIA, and Temasek.

Leadership

Jeremy O'Brien
Co-Founder and Chief Executive Officer

Former Professor of Physics and Electrical Engineering at the University of Bristol, where he led one of the world's foremost photonic quantum computing research groups before co-founding PsiQuantum.

Terry Rudolph
Co-Founder and Chief Strategy Officer

Theoretical physicist and architect of the Raussendorf-Harrington-Goyal (RHG) lattice and related photonic cluster-state fault-tolerance frameworks that underpin PsiQuantum's technical approach; previously a professor at Imperial College London.

Pete Shadbolt
Co-Founder and Chief Scientific Officer

Oxford-trained photonic quantum computing researcher who co-authored foundational experimental demonstrations of photonic quantum information processing alongside O'Brien at Bristol.

Mark Thompson
Co-Founder and Chief Technology Officer

Former Professor at the University of Bristol's Centre for Quantum Photonics, with deep expertise in integrated photonic chip design and fabrication for quantum applications.

Cynthia Grimm
Chief Financial Officer

Experienced technology CFO with prior executive finance roles in semiconductor and deep-tech companies; joined PsiQuantum to manage the significant capital requirements of its fab-centric scaling strategy.

Technology

PsiQuantum's technical architecture is built on photonic qubits encoded in single photons, processed using linear optical elements (beam splitters, phase shifters, switches) and photon-number-resolving (PNR) detectors integrated on silicon photonic chips. The company employs a measurement-based quantum computing (MBQC) paradigm, sometimes called one-way quantum computing, in which computation proceeds by generating large entangled cluster states of photons and then performing adaptive single-qubit measurements. Fault tolerance is achieved through a topological error-correcting code — specifically a variant of the 3D cluster-state architecture compatible with photon loss and measurement errors — that is designed from the ground up to tolerate the dominant error mode in photonic systems: photon loss. This is architecturally distinct from superconducting or trapped-ion approaches, where gate errors and decoherence are the primary challenges.

The key manufacturing differentiator is PsiQuantum's reliance on GlobalFoundries' 45RFSOI process node for photonic chip fabrication. This means PsiQuantum's chips are produced in a commercial fab environment with the process discipline, yield control, and throughput of a leading semiconductor foundry — not a university cleanroom. The company also works with SkyWater Technology, though the strategic picture there became more complicated with IonQ's acquisition of SkyWater (regulatory approval received July 2026), which may affect PsiQuantum's access or terms. The cryogenic requirement remains: PsiQuantum's superconducting nanowire single-photon detectors (SNSPDs) require cooling to approximately 4 Kelvin, which is achievable with standard liquid-helium cryostats and is far less demanding than the 15–20 millikelvin required by superconducting qubit platforms.

As of early 2026, PsiQuantum has not publicly disclosed a working multi-qubit logical processor with published benchmark results. The company has demonstrated key photonic components — high-fidelity single-photon sources, low-loss waveguides, and high-efficiency PNR detectors — fabricated in the GlobalFoundries process, and has published component-level results in peer-reviewed literature. However, the integrated system capable of fault-tolerant computation remains a future milestone. This is the central technical risk: component demonstrations do not constitute a quantum computer, and the path from photonic chip components to a million-qubit fault-tolerant system involves enormous unsolved engineering challenges around photon loss budgets, classical control overhead, and cryogenic interconnects at scale.

Key Systems

Performance Highlights

Financials

PsiQuantum is a private company with no public market listing and no disclosed revenue, reflecting its deliberate decision to build toward fault-tolerant quantum computing without intermediate commercial products. The company is entirely funding-dependent and has executed one of the most aggressive capital raises in the history of quantum computing. Its two most recent rounds dominate the capital structure: a $1 billion Series E in September 2025 at a $7 billion valuation, and a $1.5 billion Series F in May 2026 that lifted the valuation to $10.5 billion. Both were led by BlackRock, Baillie Gifford and Temasek, with NVIDIA's NVentures, the Qatar Investment Authority, Macquarie Capital and Morgan Stanley's Counterpoint Global participating. Total disclosed private equity now stands at roughly $3.9 billion, making PsiQuantum the most heavily capitalised private quantum hardware company globally.

In addition to private equity, PsiQuantum has secured substantial government funding that is non-dilutive or equity-linked on favorable terms. The $125M DARPA contract (July 2026) and the $100M CHIPS Act Commerce Department award (finalized September 2026) together represent $225M in additional federal commitments, on top of prior Australian government funding (reported at approximately AUD $940 million in combined Queensland and federal Australian government commitments made in 2023) that underpins the Quantum Shore facility. Combined, total capital commitments to PsiQuantum — private equity plus government awards across multiple jurisdictions — likely exceed $3 billion in aggregate, though the precise mix of grants, contracts, and equity investment is not fully public.

Burn rate is not publicly disclosed, but building a million-qubit photonic quantum computer, constructing a dedicated facility in Australia, and maintaining deep fab partnerships implies an annual cash consumption in the hundreds of millions of dollars. The $1.5B May 2026 Series F combined with the government awards provides meaningful runway, but the company will almost certainly require additional capital before achieving fault-tolerant operation. Burn rate, milestone slippage, and the absence of any near-term revenue path are the dominant financial risks.

Key Figures

Milestones

May 2026
Closed a $1.5 billion Series F at a $10.5 billion valuation

Led by existing backers BlackRock, Baillie Gifford and Temasek, with Macquarie Capital, NVIDIA's NVentures, the Qatar Investment Authority and Morgan Stanley's Counterpoint Global participating. Raised the company's valuation from $7B to $10.5B in eight months and makes PsiQuantum the most heavily capitalised private quantum hardware company, funding the million-qubit build-out without an intermediate commercial product.

September 2025
Closed a $1 billion Series E at a $7 billion valuation

Led by BlackRock, Temasek and Baillie Gifford with NVIDIA's NVentures and the Qatar Investment Authority participating — the entry of sovereign wealth and major institutional asset managers marked quantum hardware being treated as a legitimate asset class rather than venture speculation.

June 2026
Broke ground on Quantum Shore facility in Moreton Bay, Australia

Transitions PsiQuantum from planning to active construction of what it claims will be the world's first utility-scale quantum computing facility; backed by substantial Australian government funding and represents a major infrastructure commitment.

July 2026
Secured $125M DARPA contract for utility-scale quantum evaluation

Major U.S. Department of Defense validation of the photonic approach; milestone-contingent structure means DARPA will be monitoring technical progress closely, adding both credibility and accountability.

September 2026
Finalized $100M CHIPS Act award from U.S. Department of Commerce

Federal endorsement of PsiQuantum's photonic approach as a national priority; combined with the DARPA award, secures $225M in U.S. government non-dilutive or milestone-based funding within approximately two months.

July 2026
Scientists publicly called for halt to Quantum Shore construction over contamination concerns

University of Calgary scientists raised environmental contamination concerns at the Moreton Bay site; introduces regulatory, reputational, and timeline risk to PsiQuantum's flagship infrastructure project.

2023
Announced approximately AUD $940M in combined Queensland state and Australian federal government funding commitments for Quantum Shore

Largest single government quantum computing commitment to a private company at that time; validated Australia as a serious quantum infrastructure partner and provided the financial foundation for the Moreton Bay facility.

2021-2022
Announced foundry partnerships with GlobalFoundries and SkyWater Technology for silicon photonic chip fabrication

Established the core manufacturing thesis: quantum chips fabricated in commercial semiconductor fabs, enabling yield, quality control, and scalability unavailable in research environments.

Roadmap

PsiQuantum's publicly stated roadmap is organized around a single destination: a fault-tolerant quantum computer operating at utility scale, requiring approximately one million physical photonic qubits. The company has consistently declined to publish interim qubit-count milestones or NISQ-era product timelines, arguing that partial-scale photonic systems do not offer useful commercial advantage and that engineering resources are better concentrated on the full-scale architecture. Fault tolerance is targeted via a 3D cluster-state topological error-correcting code that is photon-loss-tolerant by design, with the physical error threshold estimated to be compatible with achievable photonic component fidelities in the GlobalFoundries process node.

The construction of the Quantum Shore facility in Moreton Bay, Australia — groundbreaking June 2026 — represents the company's primary near-to-medium-term physical milestone. This facility is intended to house early utility-scale hardware once the photonic chip technology matures sufficiently. No specific completion date or first-system-online date for Quantum Shore has been publicly confirmed as of mid-2026. The company has previously suggested that a useful fault-tolerant machine could be operational by the late 2020s or early 2030s, but these timelines have not been formally updated and should be treated as aspirational rather than committed. The DARPA contract's milestone-contingent structure will provide some external forcing function on demonstrated progress.

A critical roadmap gap is the absence of any publicly disclosed intermediate system demonstration — no multi-qubit logical processor, no published gate fidelity on an integrated photonic system, no quantum volume or equivalent benchmark. PsiQuantum's roadmap effectively asks investors and government funders to trust that component-level demonstrations and architectural analysis will translate to system-level success at million-qubit scale, a leap that is substantially larger and less evidenced than what most competing modalities have demonstrated at equivalent funding levels. This is simultaneously the company's greatest technical risk and, if it succeeds, its most defensible competitive position.

Competitive Position

PsiQuantum is the dominant private-sector photonic quantum computing company by capitalization and government endorsement, but it competes in a broader landscape where multiple modalities are being heavily funded. Its most direct architectural competitors are limited: Xanadu (Toronto) pursues continuous-variable photonic quantum computing with a different error-correction approach and has deployed cloud-accessible photonic hardware (the Borealis system), while QuiX Quantum (Netherlands) focuses on photonic quantum processing units for near-term applications. Neither poses a near-term existential threat, but both demonstrate that the photonic space is not PsiQuantum's alone. The more serious competitive pressure comes from superconducting (IBM, Google) and trapped-ion (IonQ, Quantinuum) players, which already have working multi-qubit systems with published benchmarks and, in some cases, paying customers — a commercial validation that PsiQuantum entirely lacks.

The strategic question for PsiQuantum is whether fault-tolerant scale can be achieved before competitors in other modalities reach useful fault tolerance with fewer physical qubits. IBM has published roadmaps targeting error-corrected logical qubits in the 2025-2027 timeframe using superconducting hardware; Google's surface-code error correction demonstrations have shown meaningful progress. The emergence of Oratomic in July 2026 — claiming fault tolerance at roughly 20,000 neutral-atom physical qubits — is the most pointed architectural challenge to PsiQuantum's premise, as it asserts that the qubit overhead PsiQuantum is engineering around (one million physical qubits) is not a universal requirement but an artifact of photonic architecture. If neutral-atom or other modalities achieve fault-tolerant computation at significantly lower physical qubit counts, PsiQuantum's decade-long capital accumulation and fab-scale strategy could be structurally disadvantaged.

PsiQuantum's defensible advantage, if the approach works, is manufacturing scalability: photonic chips in a commercial CMOS fab can, in principle, be produced with the yield and reproducibility of modern semiconductors, enabling cost curves that cryogenic qubit approaches cannot access. This is a real and theoretically compelling moat. The IonQ acquisition of SkyWater Technology introduces a new vulnerability: a competitor now controls one of PsiQuantum's secondary foundry partners. GlobalFoundries remains the primary fab relationship, but the SkyWater dynamic bears monitoring for any restrictive commercial implications.

Risks & Opportunities

Key Risks

  • No working integrated multi-qubit photonic system has been publicly demonstrated; component-level results do not validate system-level performance, and the integration challenges at scale remain unproven.
  • Oratomic's July 2026 claim of fault tolerance at ~20,000 physical qubits (neutral atoms) — if validated — would fundamentally undercut PsiQuantum's thesis that ~1 million physical qubits are necessary, potentially rendering the photonic approach structurally uncompetitive.
  • IonQ's acquisition of SkyWater Technology gives a direct competitor control over one of PsiQuantum's foundry partners, introducing potential supply chain complications or unfavorable commercial terms.
  • Environmental contamination concerns at the Quantum Shore construction site in Moreton Bay, raised publicly by University of Calgary scientists in July 2026, could result in regulatory delays, cost overruns, or reputational damage affecting the Australian government funding relationship.
  • Extreme capital intensity with no revenue path: the company will likely require additional multi-hundred-million-dollar capital raises before achieving fault-tolerant operation, exposing investors to significant dilution risk in a market where quantum timelines have historically slipped.
  • The DARPA $125M contract is milestone-contingent; failure to hit performance benchmarks could result in reduced or withheld disbursements, affecting cash position.
  • Photon loss remains the dominant engineering constraint; achieving the loss budgets required for fault-tolerant operation across a million-qubit integrated system has not been demonstrated at any scale approaching the target architecture.
  • Technology timeline risk: if competing modalities (superconducting, trapped-ion, neutral atom) achieve commercially useful fault-tolerant computation before PsiQuantum, the market opportunity may be captured before photonic systems are operational.

Key Opportunities

  • The $1B June 2026 private round and $225M in U.S. government awards secured within 90 days provide the most robust capital position in PsiQuantum's history, offering extended runway to reach critical technical milestones.
  • If silicon photonic manufacturing at GlobalFoundries achieves the component fidelities required for fault-tolerant operation, the cost-scaling curve for photonic chips is structurally superior to cryogenic qubit systems, potentially enabling dramatically lower cost-per-logical-qubit at scale.
  • Growing urgency around cryptographically relevant quantum computing — underscored by September 2026 research halving the estimated resource cost to break Bitcoin/Ethereum elliptic-curve cryptography — strengthens the policy and commercial case for fault-tolerant quantum hardware, directly benefiting PsiQuantum's positioning.
  • The Quantum Shore facility, backed by approximately AUD $940M in Australian government support, provides a government-funded hardware home that de-risks the infrastructure capital requirement and gives PsiQuantum a dedicated facility outside U.S. geopolitical constraints.
  • NVIDIA's participation in the June 2026 $1B round signals potential integration of photonic quantum hardware with GPU-accelerated classical computing infrastructure, opening a pathway to hybrid quantum-classical architectures that could be commercially relevant earlier than full fault-tolerant operation.
  • Broad U.S. government commitment across DARPA, Commerce Department, and the CHIPS Act framework positions PsiQuantum as a national security-relevant asset, reducing political risk of funding withdrawal and potentially enabling access to classified application development.

Investment Considerations

⚑ GroundState Take

The bull case for PsiQuantum rests on a single but potentially decisive insight: if fault-tolerant quantum computing requires approximately one million physical qubits regardless of modality, then the only path to economic viability runs through manufacturing scale, and manufacturing scale in quantum computing means silicon photonics in a commercial fab. No other approach can plausibly produce millions of qubits with the yield consistency and cost trajectory of a CMOS foundry. PsiQuantum has secured the capital — now likely exceeding $3 billion in aggregate commitments — the government validation, the manufacturing partnerships, and the physical infrastructure to attempt this. The June 2026 $1B round from BlackRock, NVIDIA, and Temasek is not venture capital chasing a hype cycle; these are sophisticated institutional allocators making a calculated bet on a decade-long infrastructure play. If PsiQuantum is right about the physics and right about manufacturing, it holds a structural moat that would be extraordinarily difficult to replicate. The company's founders are among the world's foremost photonic quantum computing researchers, and its technical leadership has remained intact, which is not trivial in a sector with intense talent competition.

The bear case is grounded in what PsiQuantum has not demonstrated. After nearly a decade and billions in committed capital, there is no integrated multi-qubit photonic system with published benchmarks. Component demonstrations are necessary but not sufficient, and the engineering integration problem — assembling millions of photonic components with sub-threshold loss rates, coordinating classical control at cryogenic temperatures, generating on-demand indistinguishable photons at scale — is orders of magnitude harder than anything demonstrated. Oratomic's July 2026 claim of fault tolerance at 20,000 neutral-atom qubits, if validated, would be an architectural refutation of the million-qubit premise, making PsiQuantum's enormous capital commitment look like a wrong-turn infrastructure bet. The SkyWater-IonQ situation, the Quantum Shore environmental controversy, and the milestone-contingent nature of the DARPA contract all introduce operational fragility. Investors considering PsiQuantum — in any future liquidity event, secondary market, or IPO context — must be comfortable with the possibility that the company reaches technical success too late, at too high a cost, or against a competitive landscape where the problem has already been solved more efficiently by a different architecture.

Editorial Note

Funding history fact-checked against public sources on 2026-09-16: the Series E ($1B, September 2025, $7B valuation) and Series F ($1.5B, May 2026, $10.5B valuation) figures were corrected after generation.

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