Code, compile and deploy quantum applications from classical languages.

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A universal software developer tool to program quantum applications

We are pioneering an approach to quantum computing that allows users to write programs in classical languages that can be compiled and run on conventional or quantum computers, without any knowledge in quantum computing.

Whether you are a software developer interested in quantum computing, or an expert who is highly proficient in quantum information theory, you'll be able to gain a quantum speedup without the need to understand the underlying computational model. Our compiler automatically constructs quantum algorithms from classical code, so you can develop quantum algorithms for new domains without deep quantum expertise.

About us

We democratise quantum computing applications for businesses by removing the need for quantum algorithms knowledge for software developers. For that, we are building a compiler that automatically constructs quantum algorithms from classical code.

Our company was founded in 2018 in Singapore by Dr Joe Fitzsimons, DPhil from Oxford, a specialist in quantum computing and computational complexity theory with over 15 years of experience. The leadership team also includes Dr Si-Hui Tan, PhD from MIT, who has been actively involved in quantum research for 15 years.

A seed round led by SGInnovate and seed-plus led by Sequoia Capital India allowed our company to bring its financing to SGD 4.5 million (USD 3.23 million). Other investors include Abies Ventures, DCVC, Qubit Protocol, Summer Capital and Posa CV.

Our team

Our interdisciplinary team of physicists and computer scientists is trained in top-tier science and engineering universities, such as Oxford, MIT, University of Melbourne, University of California, Berkeley, University of Waterloo, Canada, and Brown University.

Our quantum scientists average 8+ years of postdoc working experience. Individually, we have published extensively in peer-reviewed journals and continue contributing to scientific research.

Together with seasoned technical team and business staff, we pursue the same ambition: enable quantum applications for the real world by bridging the gap between software engineering and quantum computing.

Latest news

Horizon Quantum Computing announces plans for European expansion with an office in Ireland
November 24, 2022

Horizon Quantum Computing announces its plans to set up its European office in Ireland.

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Horizon Quantum Computing announces plans for European expansion with an office in Ireland
November 24, 2022

Horizon Quantum Computing announces its plans to set up its European office in Ireland.

Horizon Quantum Computing to open European office in Ireland
November 24, 2022

Our CEO Dr Joe Fitzsimons shared in an interview with The Irish Times about the factors that made Horizon choose Ireland for our first overseas office.

“Quantum Quandary” panel at ATxSG
June 9, 2022

Horizon’s Chief Science Officer Dr Si-Hui Tan shared her views on the potential of quantum computing at Asia’s flagship tech event ATxSummit 2022.

Singapore sets the pace for quantum computing in Southeast Asia
June 6, 2022

Tech Wire Asia caught up with Dr Si-Hui Tan, Chief Science Officer at Horizon Quantum Computing at the ATxSG summit to get her views on the industry, from the technology to the talent development in the field.

Singapore investing SGD 23.5 million to boost quantum technology capabilities
May 31, 2022

Horizon’s CSO Dr Si-Hui Tan was on CNA to explain key concepts of the technology, talk about its potential for industries, and highlight Singapore’s position in the quantum computing race.

Horizon Quantum Computing to become a node on Singapore’s Quantum-Safe Network
February 17, 2022

Horizon Quantum Computing, a Singapore-based company providing software development and deployment tools for quantum computing applications, is to become a node on the National Quantum-Safe Network (NQSN) announced by the National Research Foundation, Singapore, and the National University of Singapore (NUS).

How Horizon plans to bring quantum computing out of the shadows
September 10, 2021

Breakthroughs in quantum computing keep coming – the latest quantum processor designed by Google has solved a complex mathematical calculation in less than four minutes; the most advanced conventional computers would require 10,000 years to get to an answer. Here’s the problem though: even as scientists perfect the quantum computing hardware, there aren’t many people with the expertise to make use of it, particularly in real-life settings.

‍Researchers find a way to check that quantum computers return accurate answers
September 2, 2021

As quantum computers become ever more powerful, how can we be sure that the answers they return are accurate? A team of physicists, including Horizon’s CEO Joe Fitzsimons, have developed a new method to use one unreliable quantum processor to verify another and implemented it on five different quantum processors.

Universal and operational benchmarking of quantum memories
July 13, 2021

Systematic means of benchmarking the performance of a quantum processor are still mostly missing. Xiao Yuan, Yunchao Liu, Qi Zhao, Bartosz Regula, Jayne Thompson (Horizon’s Technical Product Manager) and Mile Gu studied a practically meaningful, experimentally accessible, and universally relevant quantifier of a memory’s capability to preserve the quantum advantage. This measure applies unilaterally to all platforms, allowing us to benchmark processors across different architectures.

Probabilistic one-time programs using quantum entanglement
June 15, 2021

Marie-Christine Roehsner, Joshua A. Kettlewell, Joe Fitzsimons (Horizon’s CEO)and Philip Walther, engineered and experimentally realized a new protocol for running probabilistic one-time programs on a quantum computer that resolved major drawbacks of all previously known schemes. By encoding classical software in small quantum states, the team was able to design and successfully execute single use copies of quantum software.

AWS Summit Online ASEAN: A sneak peek into the future with Quantum Computing
May 19, 2021

As shared by Dr Werner Vogels, CTO of Amazon, 2021 will be the year when quantum computing will start to blossom, and Singapore is at the forefront of this exciting field. In this session, Michael Brett, Principal Specialist at Amazon Braket, welcomes our CEO Dr Joe Fitzsimons who introduces Horizon’s classical to quantum toolchain and explains how Horizon is leveraging Amazon Braket to build solutions that have the potential to revolutionise other industries.

The Quantum Daily: 5 Singapore-based quantum startups doing the island city state proud
May 7, 2021

Singapore, a skyscraper-laden, tropical paradise known for its business-friendly policies. With the second-highest GDP per capita (PPP) in the world, it’s no wonder this island city-state — one of the Four Asian Tigers — has some of the most innovative startups in the world. This goes for startups in the quantum tech ecosystem, too, with a handful so far founded within the last half a decade.

Smooth input preparation for quantum and quantum-inspired machine learning
April 26, 2021

Quantum algorithms for practical machine learning models can load data from QRAM in constant time without violating the search lower bound. The study, published in Quantum Machine Intelligence Journal, was conducted by Jansen Zhikuan Zhao, Jack F., Patrick Rebentrost, Vedran Dunjko and Joe Fitzsimons (Horizon’s CEO).

The Straits Times: International Day of Women and Girls in Science
February 15, 2021

Dr Si-Hui Tan had already developed a keen interest in mathematics and science in secondary school. From Raffles Girls’ School she went on to pursue advanced mathematics and a degree in physics, and eventually earned herself a post-doctorate degree in physics at the Massachusetts Institute of Technology (MIT). Today, the 40-year-old is the chief science officer at a local start-up, Horizon Quantum Computing. The company aims to make quantum computing more accessible to software developers.

Experimental quantum homomorphic encryption
February 5, 2021

This new approach doesn’t require any communication between the client and server once the data has been passed off, while providing some data security for a variety of quantum computations. The study was conducted by Jonas Zeuner, Ioannis Pitsios, Si-Hui Tan (Horizon's CSO), Aditya N. Sharma, Joe Fitzsimons (Horizon's CEO), Roberto Osellame and Philip Walther.

AsiaTechDaily: How Joe Fitzsimons CEO Of Horizon Quantum Computing raised $3.2M to build software-development tools to enable the next revolution in computing?
September 28, 2020

Driven by the vision of quantum computing as a revolution in computing technology, Joe Fitzsimons quit his tenured faculty position to found Horizon Quantum Computing in 2018. Drawing on over 15 years’ experience in quantum computing and computational complexity theory, today he fully dedicates his time to Horizon with the goal of making quantum computing a general-purpose computing technology capable of addressing some of the world’s most challenging computational problems.

Identical quantum particles pass practicality test
September 28, 2020

Identical particle entanglement can be coaxed into mediating other forms of entanglement that are already widely used in quantum computing and communications technologies, as recently demonstrated by a team of researchers from the University of Nottingham and University of Basel. Horizon's Technical Product Manager Jayne Thompson offered her opinion as part of a Scientific American article about the study.

The short weird life—and potential afterlife—of quantum radar
September 23, 2020

Science Magazine puts the spot on quantum illumination, often dubbed "quantum radar", and the important role played by work that our Chief Science Officer Si-Hui Tan did during her PhD at Massachusetts Institute of Technology, back in 2008, comparing quantum with entangled photons and coherent states.

The Edge Singapore: Horizon Quantum Computing aims to simplify quantum software development

September 4, 2020

Late last year, the world of quantum computing achieved a significant milestone. A quantum processor developed by Google was able to solve a complex mathematical calculation in just three minutes and 20 seconds. In comparison, the most advanced supercomputer to date would have taken more than 10,000 years to solve it.

Hybrid machine learning algorithm optimises engineering of quantum sensors

August 28, 2020

Quantum technologies can be designed more efficiently if they can be trained in self-improvement. A team of researchers in Singapore and China, including Jayne Thompson, who recently joined Horizon Quantum Computing as a Technical Product Manager after doing research for Centre for Quantum Technologies, have demonstrated this potential through engineering a new method to machine learn quantum-enhanced probes for precision sensing applications.

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