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SuperconductingEst. 2020Paris, France

Alice&Bob

Alice & Bob

Error correction, baked into hardware.

Paris-based startup building 'cat qubits' that suppress errors in hardware, aiming for a fault-tolerant machine with far fewer qubits.

Named After Fictional Cryptographers

'Alice and Bob' are the classic characters in every quantum cryptography protocol.

Led by Théau Peronnin (CEO)

The Story

Timeline.

2020

Founded in Paris to commercialize cat-qubit research from ENS and Yale.

2022

Demonstrates a cat qubit with bit-flip lifetimes measured in seconds.

2023

Raises a €27M round to build the first cat-qubit chip.

2024

Publishes roadmap targeting a 100-logical-qubit machine with only ~1,500 physical qubits.

What makes them different

Key Facts

  • Cat qubits exponentially suppress bit-flip errors in hardware.
  • Could reach fault tolerance with 60x fewer qubits than a naive superconducting approach.
  • Named after 'Alice and Bob', the fictional characters used in quantum protocols.
  • Backed by Bpifrance, Elaia, and the European Innovation Council.

Real-world pilots

Quantum Uses Today

  • Chip-level research contracts with European agencies.
  • Public roadmap for a 100-logical-qubit machine by the end of the decade.

If they succeed

Potential Applications

  • Fault-tolerant machines small enough to fit in a single dilution fridge.
  • Chemistry and materials simulation with practical qubit counts.
  • European quantum sovereignty with a homegrown fault-tolerant stack.