When will a 1000 Qubit Quantum Computer be built?

Quantum computing is one of the most exciting and promising new technologies currently being developed. Quantum computers utilize the strange effects of quantum mechanics to perform calculations in fundamentally different ways than traditional, classical computers. This allows them to solve certain problems much more efficiently.

Qubit Quantum Computer

The Promise of Quantum Computing

One major application where quantum computers are expected to excel is simulating quantum physics. Traditional supercomputers struggle to simulate the behavior of more than around 50 quantum particles. However, a sufficiently large quantum computer would allow physicists to accurately model complex quantum systems with hundreds or thousands of particles. This could lead to major new discoveries in fields like chemistry, materials science, and pharmacology.

Quantum computers may also revolutionize fields like artificial intelligence and machine learning by enabling new quantum algorithms. Certain tasks like searching unsorted databases or factoring large numbers into primes could potentially be sped up by many orders of magnitude. This would have major implications for cryptography and codebreaking.

Current State of Quantum Computers

In recent years, there has been immense progress in building small scale quantum computers called “Noisy Intermediate Scale Quantum” (NISQ) devices.

Leaders in the Quantum Computer Race

Tech giants like IBM, Google, Intel, and startups like Rigetti and IonQ have all demonstrated quantum computers with around 50-100 qubits (quantum bits). China is also investing heavily in quantum computing research.

Recent Achievements

In late 2022, startup Quantinuum announced a quantum computer named “H1-2” with a recordbreaking 116 qubits. This shows the rapid pace of progress. However, despite reaching over 100 qubits, experts believe these current NISQ devices are still far from achieving the valuable applications promised by quantum computers. Most algorithms require thousands or even millions of logical qubits.

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When Will We Reach Key Qubit Milestones?

Most experts predict we will continue seeing exponential growth in qubit counts over the next decade. But there is uncertainty around exactly when key milestones will be reached.

1000 Physical Qubits

A survey of over 60 quantum computing experts published in 2022 predicted we have a 50% chance of reaching 1000 physical qubits by around 2026-2027. There is optimism this milestone could be achieved in the next few years by a combination of startups, tech giants, and national lab efforts.

1000 Logical Qubits

However, the number of physical qubits is different than logical qubits. Error correction techniques are used to encode a single logical qubit across many physical qubits. This makes quantum algorithms fault tolerant against qubit errors and decoherence. Most algorithms require thousands of logical qubits to provide enough redundancy. The 2022 expert survey predicted 1000 logical qubits will take about twice as long likely being reached between 2029-2035. This is because the error rates of quantum hardware need to improve substantially first. So this is a much harder milestone.

Major Challenges on the Road to 1000 Qubits and Beyond

There are still immense scientific and engineering challenges to overcome before large fault tolerant quantum computers become a reality.

Scaling Up Qubits

While rapid progress has been made with superconducting qubits by companies like Google and IBM, new architectures like trapped ions may be needed to reach substantially higher qubit counts. Managing interconnections and control signals across thousands of qubits will require major hardware advances.

Error Correction and Noise

Today’s NISQ devices have error rates of 1% or higher per qubit. This results in too much “noise” for running advanced quantum algorithms. Reducing noise and developing sophisticated error correcting codes is critical for reaching the 1000+ logical qubits needed.

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Manufacturing and Materials

Mass producing the exotic materials and precision components needed for qubits will require mastering complex nanofabrication techniques. Ensuring consistency across large qubit arrays will also be challenging.

Timeline Summary

In summary, experts predict that we have around a 50% chance of reaching 1000 physical qubits by around 2026-2027 assuming the current exponential pace of progress continues. However, developing the 1000 logical qubits with low enough error rates to unlock more advanced applications is a harder challenge. The consensus is this likely won’t be achieved until 2029-2035 unless there are major unanticipated breakthroughs. Finally, realizing the promised potential of quantum computing for fields like quantum simulation will ultimately require millions of logical qubits which may not happen until closer to 2040-2050. So while rapid progress is being made, there is still a long road ahead to build a fully fault tolerant quantum computer.


Quantum computing holds immense promise to one day revolutionize fields ranging from material science to AI by exploiting quantum mechanical effects for calculations. Experts predict that quantum computers will continue rapidly adding more qubits over the next decade with a 50% chance of reaching 1000 physical qubits by around 2026-2027. However, developing the error correction techniques to achieve 1000+ logical qubits will likely take about twice as long potentially being reached between 2029-2035. There are still major hardware and engineering obstacles around scaling up to the millions of qubits needed to realize the true potential of quantum computers. But if these challenges can be overcome, quantum computing could transform computing and unlock solutions to problems that classical computers struggle with.


What are the main challenges to overcome before large, fault-tolerant quantum computers can be built?

The main challenges are:

  1. Scaling up to thousands of qubits while managing control signals and interconnects
  2. Reducing noise and errors to enable logical qubits with error correction
  3. Advancing manufacturing and materials science to mass produce precision qubit components
  4. Developing sophisticated algorithms that can exploit quantum effects for useful applications
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Which qubit milestone will likely be reached first 1000 physical qubits or 1000 logical qubits?

1000 physical qubits will likely be reached first, with experts predicting a 50% chance of reaching this by around 2026-2027. Achieving 1000 logical qubits is predicted to take about twice as long potentially being reached between 2029-2035.

What are logical qubits and why are they harder to achieve than just physical qubits?

Logical qubits use error correction techniques to encode a single qubit across many physical qubits. This makes algorithms fault tolerant against noise and errors. But substantially lower physical qubit error rates are needed first to reach high logical qubit counts, presenting a harder engineering challenge.

Who are the current leaders in building quantum computers today?

Tech giants like IBM, Google, Intel, Microsoft as well as startups like IonQ and Rigetti have built prototype quantum computers with around 50-100 qubits so far. China is also investing heavily in quantum computing research and making rapid progress.

When could quantum computers finally deliver on their promised potential for fields like quantum physics simulation?

Useful small scale applications could emerge over the next decade. But simulating complex quantum systems is estimated to require millions of logical qubits, which likely won’t be possible until at least 2040-2050 based on current progress rates according to experts.