PhD - Quantum Error Correction Codes for Cat Qubits M/F/D

Unist; Paris; Hybrid; EUR 37,000 - 47,000; Full time

Benefits offered by this job

BSPCE plan

Remote work up to 40%

Parental plan

25-day vacation policy

Meal vouchers

Job summary

QuBriC is seeking a PhD candidate for a 36-month, full-time MSCA Doctoral Network project in Paris to develop high-rate, biased-noise-adapted QEC codes for cat qubits and to co-design the corresponding logical operations within a diverse, international team.

The successful candidate will join Alice & Bob SAS in Paris, with supervision by Dr Christophe Vuillot, and participate in 2–3 secondments across France, the Netherlands and Spain, while following the program's rigorous training and

Qualifications

• MSc degree in Quantum Engineering or Physics completed by recruitment date
• Demonstrated background in quantum information or quantum computing
• Proficiency in scientific programming with Python
• Proficiency in English (written and oral)
• MSCA eligibility - doctoral candidate: you must NOT already hold a doctoral degree
• MSCA eligibility - mobility rule: you must not have resided or carried out your main activity in France for more than 12 months in the 36 months before recruitment
• Full-time availability for the 36-month appointment

Responsibilities

• Develop and benchmark high-rate, biased-noise‑adapted QEC codes and corresponding logical-gate protocols using lifted-product and asymmetric-distance constructions
• Co-design logical operations (homomorphic CNOT, transversal Clifford, algorithmic subroutines), incorporating noise bias, connectivity, and measurement constraints
• Validate designs via hardware-in-the-loop simulations and small-scale cat‑qubit experiments
• Benchmark biased‑noise performance and decoder compatibility, providing feedback to the network’s architecture and decoder work packages
• Contribute to an open online library of high-rate codes and logical protocols for biased‑noise qubits, including analysis of resource overhead, and to open datasets/tools for reproducible biased‑noise co-design
• Publish your results in leading journals and present them at international conferences
• Follow the QuBriC doctoral training programme (QEC foundations, coding theory, architectures, decoders, hardware integration), Sorbonne Université doctoral training courses, plus Alice & Bob’s internal courses on biased noise, QEC, and cat qubit hardware
• Carry out the secondments and contribute to the network’s outreach and open‑science activities

Skills

Python programming

English proficiency

Education

MSc in Quantum Engineering or Physics

Job description

Organisation/Company QuBriC MSCA DN Research Field Computer science » Computer architecture Researcher Profile First Stage Researcher (R1) Positions PhD Positions Application Deadline 18 Dec 2026 - 23:59 (Europe/Paris) Country Netherlands Type of Contract Temporary Job Status Full-time Is the job funded through the EU Research Framework Programme? Horizon Europe - MSCA Is the Job related to staff position within a Research Infrastructure? No

Offer Description

PhD - Quantum Error Correction Codes for Cat Qubits M/F

Paris

PhD /

Hybrid

Alice & Bob is developing the first universal, fault-tolerant quantum computer to solve the world’s hardest problems.

The quantum computer we envision building is based on a new kind of superconducting qubit: the Schrödinger cat qubit . In comparison to other superconducting platforms, cat qubits have the astonishing ability to implement quantum error correction autonomously!

We're a diverse team of 250+ brilliant minds from over 35 countries united by a single goal: to revolutionise computing with a practical fault-tolerant quantum machine. Are you ready to take on unprecedented challenges and contribute to revolutionising technology? Join us, and let's shape the future of quantum computing together!

The PhD project
Cat qubits exponentially suppress bit-flip errors, which means the error‑correcting codes that protect them don’t have to be built like everyone else’s. Designing codes that exploit this noise bias is one of the most direct levers to shrink the hardware cost of a useful quantum computer, and it is exactly what this PhD is about.

The PhD project “Code construction & logic for biased-noise qubits”, one of 15 doctoral projects of QuBriC, is the first European MSCA Doctoral Network entirely dedicated to quantum error correction (call HORIZON-MSCA-2025-DN-01-01), bridging classical coding theory and quantum hardware.

Hosted in Alice & Bob’s Error Correction team and supervised by Dr Christophe Vuillot, you will develop high‑rate, biased-noise‑adapted QEC codes and logical‑gate protocols using lifted‑product and asymmetric‑distance constructions, co‑design logical operations, and validate your designs through hardware‑in‑the‑loop simulations and small‑scale cat‑qubit experiments.

Your results feed directly into Alice & Bob’s roadmap toward a fault‑tolerant quantum computer and into the network’s shared QEC‑hardware map, including an open online library of codes and logical protocols for biased‑noise qubits. Your doctoral degree will be awarded by Sorbonne Université, and you will be co‑supervised by Mike Vasmer (Inria Paris).

Location & life at Alice & Bob:
You'll be based in Paris with English as your working language. We offer a hybrid work arrangement, with flexible remote work up to 40% a month, and we make space for the rituals that keep us grounded, from Café Cohez on Mondays to Snacky Day on Wednesdays.
As part of the QuBriC training programme, depending on the advancement of the project, you may have 3 secondments:

• Inria (France): fault‑tolerant gate protocols and validation under realistic biased noise
• TU Delft (Netherlands): experimental benchmarking and integration of biased‑noise gate demonstrations
• University of Navarra (Spain): modelling and simulation of bias‑adapted code performance

Responsibilities:

At Alice & Bob you will:

• Develop and benchmark high-rate, biased-noise‑adapted QEC codes and corresponding logical-gate protocols using lifted-product and asymmetric-distance constructions
• Co-design logical operations (homomorphic CNOT, transversal Clifford, algorithmic subroutines), incorporating noise bias, connectivity, and measurement constraints
• Validate designs via hardware-in-the-loop simulations and small-scale cat‑qubit experiments, quantifying space–time efficiency and logical error suppression
• Benchmark biased‑noise performance and decoder compatibility, providing feedback to the network’s architecture and decoder work packages
• Contribute to an open online library of high-rate codes and logical protocols for biased‑noise qubits, including analysis of resource overhead, and to open datasets/tools for reproducible biased‑noise co-design
• Publish your results in leading journals and present them at international conferences
• Follow the QuBriC doctoral training programme (QEC foundations, coding theory, architectures, decoders, hardware integration), Sorbonne Université doctoral training courses, plus Alice & Bob’s internal courses on biased noise, QEC, and cat qubit hardware
• Carry out the secondments and contribute to the network’s outreach and open‑science activities

Requirements:

• MSc degree in Quantum Engineering or Physics completed by the recruitment date
• Demonstrated background in quantum information or quantum computing (coursework, thesis, or research projects visible on your CV)
• Proficiency in scientific programming with Python
• Proficiency in English (written and oral)
• MSCA eligibility - doctoral candidate: you must NOT already hold a doctoral degreeat the date of recruitment
• MSCA eligibility - mobility rule: you must not haveresided or carried out your main activity (work, studies, etc.) in France for more than 12 months in the 36 months immediately before your recruitment date (short stays such as holidays and compulsory national service are not counted)
• Full-time availability for the 36-month appointment, including the secondments.

We’re also looking for:

• Familiarity with quantum error correction - stabilizer formalism, fault‑tolerant logic
• Familiarity with the physics of cat qubits
• Experience with QEC simulation or resource‑estimation tooling, and a taste for open, reproducible science
• Prior research experience in a quantum computing company or lab (internship, research assistantship)

€37,000 - €47,000 a year

Salary range:

Employment contract (CDD, 36 months) with Alice & Bob SAS, with full French social security coverage:

• Gross salary 1styear : 37 000 euros
• Gross salary 2ndyear : 42 000 euros
• Gross salary 3rdyear : 47 000 euros

Practical details
Host institution / employer: Alice & Bob SAS, Paris (Île-de-France)
Doctoral enrollment: Sorbonne Université
Supervision: Dr Christophe Vuillot (Alice & Bob), with academic co-supervision under the network’s joint supervision agreements
Duration: 36 months, full-time
Expected start date: 01/12/2026

- Our success is your success: own it with ourBSPCEplan

- Direct IP Compensation:Earn substantial bonuses for driving the core patents that define our quantum architecture.

- Flexibleremotepolicy, up to 40 % a month

- A Parental planincluding additional benefits such as crèche support or additional days off to take care of children under 12 years old

- 25-day vacation policy (as per French law) ( the RTT will depend on the type of contract)

- Half of transportation cost coverage (as per French law), or yearly allowance for the die-hard bicycle users ( for a 1-year contract)

- Competitive health coverage, with Alan

- Meal vouchers with Swile, as well as access to a fully equipped and regularly stocked kitchen

- French language courses covered by the company for those interested

Research shows that women might feel hesitant to apply for this job if they don't match 100% of the job requirements listed. This list is a guide, and we'd love to receive your application even if you think you're only a partial match. We are looking to build teams that innovate, not just tick boxes on a job spec.

You will join one of the most innovative startups in France at an early stage, to be part of a passionate and friendly team on its mission to build the first universal quantum computer!

We love to share and learn from one another, so you will be certain to innovate, develop new ideas, and have the space to grow.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.