Best Quantum Computing Companies in California, United States
The 43 best Quantum Computing companies in California, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: PsiQuantum.
Ranked: Best Quantum Computing companies in California
| # | Company | Disclosed funding | Last round | Employees | Founded | Founder | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | PsiQuantum 🦄 Developer of photon-based universal quantum computers 92Patents top 9%Funding top 13%Innovation top 16%Moat top 22% All 12 signals ▾Patentstop 9% Fundingtop 13% Innovationtop 16% Moattop 22% Newstop 26% Growthtop 27% AItop 28% Talenttop 30% Markettop 35% Partnerstop 41% Techtop 45% Globaltop 50% Patents: 889 patents matched (strict assignee match) · 691 filings since 2022 vs 198 in 2017-21 Funding: Raised $1.3B across 6 rounds · 6 rounds over 7 yrs (0.9/yr) rank vs industry peers · Fliar Intelligence Index 92/100 | $1.3B | 11 mo ago | 213 | 2015 | Mark Thompson Co-Founder & CTO | 889 patents Patents concentrated in computing, sensing & instrumentation | 1 launch |
| 2 | SandboxAQ 🦄 Developer of quantitative artificial intelligence models for various industry applications 69Funding top 17%Moat top 26%AI top 30%Market top 36% All 11 signals ▾Fundingtop 17% Moattop 26% AItop 30% Markettop 36% Producttop 41% Growthtop 42% Techtop 47% Talentbottom 49% Innovationbottom 47% Globalbottom 39% Newsbottom 24% Funding: Raised $500M across 3 rounds · 3 rounds over 4 yrs (0.8/yr) Moat: Editorial + unicorn rating 8/10 · Unicorn rank vs industry peers · Fliar Intelligence Index 69/100 | $500M | 16 mo ago | 181 | 2022 | Jack Hidary Chief Executive Officer | — | 1 launch |
| 3 | D-Wave Developer and delivery of quantum computing systems, software, and services | $256M | 65 mo ago | 222 | 1999 | Haig Farris Co-Founder | 24 patents Design and optimization of distributed antenna systems and broadband wireless antenna technologies. | 1 launch |
| 4 | Rigetti Computing Developer of an AI-powered full-stack quantum computing solution based on superconducting qubits 78Product top 14%Partners top 15%Tech top 21%Innovation top 25% All 13 signals ▾Producttop 14% Partnerstop 15% Techtop 21% Innovationtop 25% Fundingtop 25% Talenttop 28% Newstop 30% AItop 45% Markettop 46% Moattop 48% Growthtop 49% Fin. healthtop 49% Globalbottom 39% Product: 5 distinct product lines · Company stage: Public Partners: 7 contract events in 12 mo · Named contractor/client in 7 deals rank vs industry peers · Fliar Intelligence Index 78/100 | $198M | 15 mo ago | 145 145 → 198 (+37%) | 2013 | — | — | — |
| 5 | Sygaldry Developer of quantum-accelerated AI servers for training and inference acceleration | $139M | 5 mo ago | — | 2024 | Michael Keiser Co-Founder | — | 1 job opening |
| 6 | Atom Computing Developer of quantum computers using arrays of optically-trapped neutral atoms | $101M | 23 mo ago | 40 | 2018 | Jonathan King Co-Founder | 100 patents Neutral‑atom quantum computing hardware: atom array assembly, optical beam control, error correction. | 2 partnerships |
| 7 | QC Ware Provider of a cloud-based computational platform for quantum computing | $33M | 61 mo ago | 50 | 2014 | — | 74 patents Quantum algorithms and hardware for chemistry, machine learning, and photonic data loading | — |
| 8 | QuSecure Provider of platform for cryptographic discovery, remediation, and compliance reporting | $28M | 18 mo ago | 79 | 2019 | Kosta Vilk Co-Founder | 24 patents Quantum‑safe cryptographic infrastructure, key management, and post‑quantum security for communications and payments | — |
| 9 | Projecteleven Provider of quantum computing technology for securing digital assets against quantum threats 53Growth top 28%Funding top 29%Tech top 44%Talent top 45% All 6 signals ▾Growthtop 28% Fundingtop 29% Techtop 44% Talenttop 45% Globalbottom 48% Marketbottom 31% Growth: Web rank 50,000,000 → 10,000,000 YoY · Fresh capital in last 24 mo Funding: Raised $26.0M across 2 rounds · 2 rounds over 1 yrs (2.0/yr) rank vs industry peers · Fliar Intelligence Index 53/100 | $26M | 7 mo ago | — | 2004 | Finn Murphy Co-Founder | — | — |
| 10 | Snowcap Compute Developer of a superconducting computing platform utilizing cryogenic cooling technology | $23M | 14 mo ago | — | 2024 | Rick Hyman Co-Founder & Member Board of Directors | — | — |
| 11 | Equal1 Developer of AI and cloud-powered silicon quantum computers | $12M | 7 mo ago | 32 | 2017 | Robert Staszewski Co-Founder | 70 patents Patents concentrated in computing, sensing & instrumentation | — |
| 12 | BlueQubit Developer of AI-based quantum computing software solutions | $7M | 25 mo ago | 10 | 2022 | Hayk Tepanyan Founder and CTO | — | 1 launch |
| 13 | Crown Sterling Data security solution | $6M | 68 mo ago | — | 2018 | Robert Grant Co-Founder & CEO | 24 patents Patents concentrated in electrical & electronics | — |
| 14 | Menten Developer of peptides using AI technology | $4M | 73 mo ago | 20 | 2018 | Vikram Mulligan Co-Founder & CTO | — | — |
| 15 | Haiqu Provider of software solutions for quantum computing | $4M | 7 mo ago | 8 | 2016 | Richard Givhan Co-Founder | 5 patents Optimizing distributed quantum computing via circuit approximation and algorithm compression techniques. | 1 partnership |
| 16 | Radical Semiconductor Provider of embedded systems for hardware security | $4M | 42 mo ago | 4 | 2019 | — | — | — |
| 17 | Qubitekk Quantum cryptography based secure M2M communication and authentication | $2M | 78 mo ago | 22 | 2012 | — | 29 patents Quantum photonic entangled‑photon sources and hardware for quantum key distribution systems. | — |
| 18 | Bleximo Manufacturer of superconducting qubits for applications in quantum computing | $2M | 95 mo ago | 13 | 2017 | Richard Maydra Co-Founder | — | — |
| 19 | Photon Spot Developer of nano wire single-photon detectors | $225K | 86 mo ago | 5 | 2009 | Vikas Anant Founder & CEO | — | — |
| 20 | AOSense Quantum sensing solutions for inertial navigation, timekeeping, and gravity measurement | $149K | 157 mo ago | 38 | 2004 | James Spilker Co-Founder/Executive Chairman | 68 patents High‑precision atomic interferometer inertial sensors and transportable optical resonator systems | — |
| 21 | Conductor Quantum Developer of quantum computers | $125K | 25 mo ago | — | 2024 | Brandon Severin Co-Founder & CEO | — | — |
Top 12 Quantum Computing companies in California
#1
Series E · Palo Alto, California · founded 2015 · 213 employees$1.3Braised▾
Developer of photon-based universal quantum computers. It uses photonic technology to develop error-corrected general-purpose quantum computers. It has applications in drug discovery, personalized medicine, artificial intelligence, and materials sciences.
- Sep 2025Series E$1B
- May 2025Series E$22M
- Apr 2024Series E$614.1M
- Apr 2024Conventional Debt—
#2
Series A · Mountain View, California · founded 2024$139Mraised▾
Developer of quantum-accelerated AI servers for training and inference acceleration. It builds tools to integrate quantum capabilities into AI models and workflows. The company aims to deliver infrastructure for quantum superintelligence. Its AI servers combine qubit modalities within a fault-tolerant architecture. This approach seeks to provide the cost, scale, and speed necessary for advanced AI applications.
- Mar 2026Series A$105M
- Seed$34M
#3
Series E · Palo Alto, California · founded 2022 · 181 employees$500Mraised▾
Developer of quantitative artificial intelligence models for various industry applications. The company provides large quantitative models rooted in science and engineered for impact. These models offer real-world solutions with clear outputs and reduced uncertainty. The company's models are deployed in areas such as drug discovery, new chemicals and materials, cybersecurity, navigation, and medical diagnostics.
- Apr 2025Series E$150M
- Dec 2024Series A$300M
- Feb 2023Series A$500M
- May 2022Seed—
#4
Series A · Stanford, California · founded 2004$26Mraised▾
Provider of quantum computing technology for securing digital assets against quantum threats. It leverages applied quantum computing to provide high quality information on quantum computation, cryptography and blockchains.
- Jan 2026Series A$20M
- Jun 2025Seed$6M
#5
Public · Berkeley, California · founded 2013 · 145 employees$198Mraised▾
Developer of an AI-powered full-stack quantum computing solution based on superconducting qubits. It designs and fabricates quantum chips, integrate them with a controlling architecture, and develops software for programmers to use to build algorithms for the chips. Its product portfolio includes a cloud-computing platform and a fabrication lab to create 3D-integrated quantum circuits.
- Apr 2025Post IPO$35M
- Mar 2025Grant (prize money)$2M
- Feb 2024Grant (prize money)—
- Jun 2022Grant (prize money)—
#6
Series A · Fremont, California · founded 2017 · 32 employees$11.6Mraised▾
Developer of AI and cloud-powered silicon quantum computers. It provides users with a platform that designs and develops universal quantum computers that use silicon-based qubits. Its features include cryogenic cooling systems, high-performance FPGA boards, and neural networks.
- Jan 2026Series A$60M
- Jun 2022Grant (prize money)$2.7M
- Dec 2021Seed—
- Oct 2021Grant (prize money)$58K
#7
Seed · San Francisco, California · founded 2016 · 8 employees$4Mraised▾
Provider of software solutions for quantum computing. It provides users with optimization software that enables scalable quantum applications. It also provides users with algorithm solutions, output distribution, and compression calculating.
- Jan 2026Seed$11M
- Jun 2023Seed$4M
#8
Seed · Palo Alto, California · founded 2024$23Mraised▾
Developer of a superconducting computing platform utilizing cryogenic cooling technology. The platform uses superconducting Josephson Junctions, offering significant energy efficiency compared to semiconductor transistors. It is built on helium-based cryogenic infrastructure and compatible with existing semiconductor processes. The platform aims to address the increasing demands of AI and HPC workloads. It provides a foundation for partners to integrate their digital designs.
- Jun 2025Seed$23M
#9
Series B · Berkeley, California · founded 2018 · 40 employees$101.2Mraised▾
Developer of quantum computers using arrays of optically-trapped neutral atoms. The company builds systems for on-premises deployment with features such as long coherence times and mid-circuit measurement. It offers tools for quantum algorithm developers to tackle challenging applications. The company focuses on developing large-scale quantum computers.
- Sep 2024Series B$10M
- Jun 2024Series B$10.2M
- Jan 2022Series B$60M
- Jul 2021Series A$16M
#10
Series A · San Mateo, California · founded 2019 · 79 employees$28Mraised▾
Provider of platform for cryptographic discovery, remediation, and compliance reporting. The platform delivers visibility and control over cryptographic assets across systems. It enables cryptographic protection deployment without code changes or system downtime. The platform generates cryptographic bill of materials reports for compliance and risk reduction.
- Feb 2025Series A$28M
- Jan 2025Seed—
- Jan 2023Seed—
#11
Public · Palo Alto, California · founded 1999 · 222 employees$256.2Mraised▾
Developer and delivery of quantum computing systems, software, and services. It offers quantum computers a dual-platform quantum computing products and services, spanning both annealing and gate-model quantum computing technologies. It help customers realize the value of quantum today through enterprise-grade systems available on-premises and via its Leap quantum cloud service.
- Mar 2021Grant (prize money)$40M
- Dec 2019Series F$10M
- Feb 2018Series F$20M
- May 2017Series F$30M
#12
Seed · San Francisco, California · founded 2022 · 10 employees$7.3Mraised▾
Developer of AI-based quantum computing software solutions. It provides users with operating systems to run specifically on quantum computers. Its features include software manufacturing, risk analysis, fraud detection, and portfolio optimization.
- Jul 2024Seed$10.1M
- Sep 2022Seed$200K
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Quantum Computing coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Quantum Computing in California is moving
A read on the academic research around Quantum Computing in California — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 1,172 papers.
- California Institute of Technology345
- University of California, Berkeley275
- University of California, Santa Barbara175
- University of Southern California117
- University of California, Los Angeles103
- Qubit73→352
- Quantum computer29→202
- Quantum algorithm8→97
- Quantum entanglement14→70
- Quantum mechanics18→70
- Qubit32→122
- Quantum computer11→78
- Quantum algorithm4→25
- Quantum error correction2→22
- Noise (video)2→17
- Quantum computer7→31
- Qubit17→37
- Quantum algorithm4→15
- Quantum decoherence1→7
- Condensed matter physics1→5
Common questions
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.