PARIS and BOSTON, May 23, 2024 Alice & Bob, a global leader in the race for fault-tolerant quantum computing, today announced the publication of its foundational research in Nature, showcasing significant advancements in cat qubit technology.

The study, Quantum control of a cat-qubit with bit-flip times exceeding ten seconds, realized in collaboration with the QUANTIC Team (Mines Paris PSL, Ecole Normale Suprieure and INRIA), demonstrates an unprecedented improvement in the stability of superconducting qubits, marking a critical milestone towards useful fault-tolerant quantum computing.

The researchers have significantly extended the bit-flip times from milliseconds to tens of secondsthousands of times better than any other superconducting qubit type.

Quantum computers face two types of errors: bit-flips and phase-flips. Cat qubits exponentially reduce bit-flips, which are analogous to classical bit flips in digital computing. As a result, the remaining phase-flips can be addressed more efficiently with simpler error correcting codes.

The researchers used Alice & Bobs Boson 3 chipset for this record-breaking result, which features a cat qubit design named TomCat. TomCat employs an efficient quantum tomography (measurement) protocol that allows for the control of quantum states without the use of a transmon, a common circuit used by many quantum companies, but one of the major sources of bit-flips for cat qubits. This design also minimizes the footprint of the qubit on the chip, removing drivelines, cables, instruments, making this stable qubit scalable. Recently, Alice & Bob made publicly available their new Boson 4 chipset that reaches over 7 minutes of bit-flip lifetime. The results from this Nature Publication can therefore be reproduced by users on Boson 4 over Google Cloud.

Although Alice & Bobs latest Boson chips are getting closer to the company bit-flip protection targets, Alice & Bob plans to further advance their technology. The next iterations will focus on boosting the cat qubit phase-flip time and readout fidelity to reach the requirements of their latest architecture to deliver a 100 logical qubit quantum computer.

Key advances highlighted in the research include:

About Alice & Bob

Alice & Bob is a quantum computing company based in Paris and Boston whose goal is to create the first universal, fault-tolerant quantum computer. Founded in 2020, Alice & Bob has already raised 30 million in funding, hired over 95 employees and demonstrated experimental results surpassing those of technology giants such as Google or IBM. Alice & Bob specializes in cat qubits, a pioneering technology developed by the companys founders and later adopted by Amazon. Demonstrating the power of its cat architecture, Alice & Bob recently showed that it could reduce the hardware requirements for building a useful large-scale quantum computer by up to 200 times compared with competing approaches. Alice & Bob cat qubit is available for anyone to test through cloud access.

Source: Alice & Bob

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Alice & Bob's Cat Qubit Research Published in Nature - HPCwire