Alice & Bob quantum computing researcher

// SCIENCE

Harnessing Quantum Nature 

// Quantum Mechanics + Computing = Quantum Computing

A qubit can be 0, 1 or somewhere in between, thanks to a fundamental law of quantum mechanics: superposition.

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If a classical bit can be represented as an arrow pointing either up or down…

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a qubit can be represented by an arrow pointing to any of the infinite points on a sphere’s surface, with ‘0’ and ‘1’ at its poles.

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Two specific cases, where the arrow is on opposite sides of the equator, are called the ‘+’ and ‘-’ states.

// When reality kicks in

Humans do not experience quantum for a reason: everything is a perturbation for a qubit.

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When a qubit is affected by noise, its state changes randomly, leading to ”bit-flips”, switching ‘0’ and ‘1’…

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or phase-flips, switching ‘+’ and ‘-’.

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Over time, we lose the quantum information encoded in the qubit, a process known as decoherence.

// THE BIG PROBLEM

Quantum Errors

Entangled Cat Alice & Bob
Currently, errors happen 10,000 times a second.
Luckily, error correction codes are designed to track these errors as they occur. By recovering quantum information, these codes help create error-corrected, logical qubits.
Entangled Cat Alice & Bob

What if you could correct errors before they even happen?

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Alice & Bob’s Cat Qubit does exactly that. Our pioneering approach is bit-flip protected.

We deal only with one class of errors, the phase-flip, reducing quantum error correction to one dimension. Simple.

Thanks to this, a logical qubit could be assembled using as few as 5 physical cat qubits.

Such a low overhead helps us lead the race to building a fault-tolerant quantum computer.

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// ROADMAP

100 Logical Qubits by 2030

Our Roadmap
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Defining The Logical Qubit

Five Criteria to Benchmark Logical Qubit Claims

Why the industry needs a shared definition of the logical qubit, and the tools anyone can use to assess the claims being made today.

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Our foundational papers

Ulysse Réglade

Quantum control of a cat-qubit with bit-flip times exceeding ten seconds

2023-07

  • Experimental work

Elie Gouzien

Performance Analysis of a Repetition Cat Code Architecture: Computing 256-bit Elliptic Curve Logarithm in 9 Hours with 126 133 Cat Qubits

2023-02

  • Theoretical work

Jérémie Guillaud

Repetition cat qubit for fault-tolerant quantum computation

2019-12

  • Theoretical work

Lescanne, Peronnin

Exponential supression of bit-flips in a qubit encoded in an oscillator

2020-03

  • Experimental work
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