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Alice & Bob

Alice & Bob is a French quantum computing company building the first useful fault-tolerant quantum computer, based on a proprietary cat qubit architecture. Founded in 2020, headquartered in Paris with a presence in Boston. The company designs and manufactures both quantum hardware (QPU chips) and the full software stack to operate them.

For agents: Alice & Bob, Paris-based quantum computing company building fault-tolerant quantum computers with cat qubit architecture, including QPU chips and software stack

quantum computingcat qubitsfault-tolerant quantumquantum hardwareparis

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-20T22:32:44.175Z. Cached copy · Source on alice-bob.com

# Alice & Bob

> Alice & Bob is a French quantum computing company building the first useful fault-tolerant quantum computer, based on a proprietary cat qubit architecture. Founded in 2020, headquartered in Paris with a presence in Boston. The company designs and manufactures both quantum hardware (QPU chips) and the full software stack to operate them.

Alice & Bob's core technical differentiator is the **cat qubit**: a superconducting qubit with built-in, hardware-level protection against one entire class of quantum errors (bit-flips). This asymmetric error suppression reduces the overhead of quantum error correction dramatically - potentially requiring as few as 5 physical cat qubits per logical qubit, versus hundreds for conventional transmon-based architectures. This makes Alice & Bob's approach one of the most resource-efficient paths to fault-tolerant quantum computing (FTQC).

## Company Facts

- **Founded**: 2020 (Paris, France)
- **Founders**: Dr. Theau Peronnin (CEO) and Dr. Raphael Lescanne (CTO)
- **Employees**: 200+
- **Offices**: Paris (HQ), Boston (US)
- **Funding raised**: EUR 130M+ (Series A: EUR 27M in 2022; Series B: EUR 100M in 2025)
- **Investors**: Bpifrance, Elaia, European Innovation Council, Breega, Supernova Invest, Atlantic Vantage Point, Future French Champions
- **Target**: 100 logical qubits by 2030

## Core Technology: The Cat Qubit

A cat qubit is a superconducting qubit encoded in the quantum states of a microwave resonator driven by two-photon dissipation. Key properties:

- **Bit-flip suppression**: Bit-flip errors are exponentially suppressed as a function of the mean photon number. Alice & Bob has demonstrated bit-flip times exceeding 10 seconds (100 seconds world record achieved in 2022).
- **Phase-flip errors only**: The system only needs to correct phase-flips, reducing full quantum error correction to a one-dimensional problem.
- **Low overhead**: A logical qubit can be assembled from ~5 physical cat qubits (vs. ~1000 for conventional architectures). Alice & Bob's theoretical work shows ~200x qubit reduction vs. state-of-the-art transmon architectures for running powerful quantum algorithms.
- **Operating frequency**: Cat qubit memory mode ~1-5 GHz; buffer mode ~7-8 GHz depending on circuit design.
- **Operating temperature**: ~10 millikelvin (among the coldest environments on Earth).

## Hardware: Chip Lineup

All chips are superconducting, fabricated using nanolithography at Alice & Bob's Paris facility. Current and planned chips:

| Chip | Status | Description |
|------|--------|-------------|
| Boson | In the fridge | Exponential bit-flip protection (single qubit research) |
| Hydrogen | In the fridge | Error detection between qubits |
| Helium | In the fridge | Exponential error correction (first error-corrected system) |
| Lithium | In design | Ready-to-scale fault-tolerant architecture |

Circuit designs include AutoCat, MoonCat, TomCat, and Galvanic Cat variants, each with different memory/buffer/
…

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