PsiQuantum

In September 2025, PsiQuantum closed a $1 billion funding round led by BlackRock, Temasek, and Baillie Gifford, bringing its valuation to $7 billion.

Major backers include BlackRock, Temasek, Baillie Gifford, and Nvidia’s venture arm, alongside earlier investors like Microsoft.

PsiQuantum was founded in 2015 by Jeremy O'Brien, Pete Shadbolt, Terry Rudolph, and Mark Thompson, a team of quantum physicists and photonics experts from the University of Bristol and Imperial College London.

The company is developing a fault-tolerant quantum computer using silicon photonics technology, which manipulates individual particles of light as quantum bits (qubits). Their approach leverages existing semiconductor manufacturing processes through a partnership with GlobalFoundries to produce quantum chips at scale.

The core system integrates specialized components including single-photon sources, detectors, and optical switches on silicon chips that can be manufactured using standard 300mm wafer processes. These components work together to create, manipulate, and measure quantum states necessary for quantum computation.

PsiQuantum's quantum computer is designed to eventually scale to over one million qubits, enabling practical applications in drug discovery, materials science, and financial modeling. The system operates at higher temperatures than competing superconducting quantum computers and can be networked together using optical fiber connections, making it more practical for real-world deployment.

Rather than pursuing incremental improvements with small numbers of qubits, PsiQuantum is focused on building utility-scale quantum computers with millions of qubits capable of running error-corrected quantum algorithms. Their approach leverages established silicon manufacturing expertise and infrastructure while developing proprietary optical switching technology crucial for connecting multiple quantum processing units.

The company's go-to-market strategy targets high-value enterprise and government customers who require massive computational power for chemistry simulation, materials science, and optimization problems that classical computers cannot solve effectively.

PsiQuantum differentiates itself through its manufacturing-first approach, using standard semiconductor processes that can potentially scale more efficiently than competing quantum technologies like superconducting or trapped ion qubits.

Their strategic partnership with GlobalFoundries provides access to advanced 300mm wafer fabrication capabilities, enabling the production of thousands of quantum components on a single wafer. This approach positions PsiQuantum to potentially achieve the scale required for practical quantum computing applications ahead of competitors still focused on laboratory-scale devices.

PsiQuantum operates in the quantum computing hardware market alongside established tech giants, quantum-focused startups, and specialized photonic quantum companies.

IBM, Google, and Microsoft represent the dominant force in quantum computing development. IBM has demonstrated working processors with over 1000 superconducting qubits, while Google achieved quantum supremacy with its 53-qubit Sycamore processor. Microsoft has invested heavily in topological quantum computing research and maintains a strategic investment in PsiQuantum.

IonQ and Rigetti lead the pure-play quantum computing companies, with market caps of $1.8B and $200M respectively. IonQ uses trapped ion technology, while Rigetti focuses on superconducting circuits.

Both companies have gone public via SPAC mergers. Quantinuum (formerly Honeywell Quantum) represents another major player using trapped ion technology.

As of November 2025, quantum computing stocks Rigetti Computing and D-Wave Quantum have fallen more than 34% from recent records after a 12‑month run exceeding 1,900%, erasing about $12 billion in combined market value.

In the photonic quantum computing space, Xanadu stands as PsiQuantum's most direct competitor. While both companies leverage silicon photonics, their approaches differ - Xanadu focuses on continuous variable quantum computing using squeezed states of light, while PsiQuantum uses single photon qubits. Both companies partner with major semiconductor foundries (GlobalFoundries for PsiQuantum, TSMC for Xanadu) to manufacture their chips.

The competitive dynamics are shifting as companies race to achieve fault-tolerant quantum computing at scale. While most competitors focus on incrementally increasing qubit counts, PsiQuantum's strategy centers on building manufacturing capabilities for millions of qubits through established semiconductor processes. This approach has attracted nearly $700M in venture funding and a $3.2B valuation.

PsiQuantum has tailwinds from the rapid advancement of semiconductor manufacturing capabilities and growing demand for quantum computing solutions, with opportunities to expand into adjacent markets beyond pure quantum computing.

PsiQuantum's partnership with GlobalFoundries enables them to leverage existing semiconductor manufacturing infrastructure to produce quantum components at scale. This approach could reduce the typically astronomical costs associated with quantum computing development. Their ability to produce quantum components using standard 300mm wafer processes positions them to potentially serve the broader quantum sensing and quantum communications markets, estimated to reach $35B by 2030.

The company's focus on achieving fault-tolerant quantum computing with millions of qubits opens opportunities in high-value enterprise applications. Financial services firms alone spend over $4B annually on high-performance computing that could be disrupted by quantum solutions. Materials science and drug discovery represent an additional $50B opportunity, as quantum computers could dramatically accelerate molecular simulation and optimization processes.

PsiQuantum's development of specialized optical switches and photonic control systems creates opportunities in the quantum infrastructure layer. As quantum computing scales, there will be growing demand for the specialized components and control systems needed to build and operate large-scale quantum systems. The quantum computing infrastructure market is projected to reach $15B by 2025.

Their recent expansion into quantum testing facilities and partnerships with national laboratories positions them to potentially offer quantum computing as a utility-scale service, similar to how cloud providers offer classical computing resources today. The quantum-as-a-service market is expected to grow to $26B by 2030.

Single technology bet: PsiQuantum has committed entirely to silicon photonics as their path to quantum computing at scale. While this approach leverages existing semiconductor manufacturing expertise, it creates significant vulnerability if fundamental technical barriers emerge that are specific to photonic qubits. The company's deep integration with GlobalFoundries and specialized manufacturing processes means pivoting to an alternative quantum computing architecture would be extremely costly and potentially fatal.

Timing risk in a fast-moving field: PsiQuantum's strategy of bypassing intermediate milestones to focus directly on million-qubit machines creates exposure to being leapfrogged by competitors. While others are demonstrating incremental progress with smaller systems, PsiQuantum may find their ambitious timeline to utility-scale quantum computing extending beyond 2025, potentially allowing competitors using different architectures to capture early market position and talent.

Manufacturing complexity: The company's approach requires precise integration of multiple novel components - single photon sources, detectors, and ultra-high performance optical switches - all at massive scale. Any yield issues or integration challenges in manufacturing these components could significantly impact costs and timeline, particularly given the unprecedented requirements for optical switch performance that exceed anything currently available.