Robust Superconducting and hybrid Quantum bits
Latest News:
Welcoming Louis Pallegoix to the team
My postdoctoral research within the RobustSuperQ project is in the continuity of the work I have done during my PhD thesis: the improvement of the microwave photon counter developed at SPEC, especially on the fabrication side. During my PhD, I have improved the reliability of the Josephson junction fabrication performed on the microwave photon counter device by implementing a variant of the Manhattan shadow evaporation technique adapted to 30 kV EBL. Besides, I have improved the sensitivity of the device, introducing a bandwidth tunability feature in the design so that thermal noise filtering is enhanced. Sensitivity and fabrication reliability have also been enhanced by smaller improvement on the fabrication side, for instance on tantalum and tantalum oxide etching. Now, during my postdoctoral research, the main objective is to scale up the fabrication of the microwave photon counter, toward waferscale fabrication. Among the objectives to achieve, one can mention the homogeneity of the resistance of the Josephson junctions throughout the wafer (already well advanced), tracking of the resistance of the newly fabricated junctions through time and automation of a monthly probe testing in that regard, systematic ABAA (Alternated Bias Assisted Annealing) treatment for transmon junctions and post-fabrication single-molecule thick coating against oxidation.
Superconducting circuit enabling the manipulation of a Schrödinger cat qubit
@N.Hoppenot/ENS Lyon
ABOUT
The RobustSuperQ project aims at accelerating French R&D on superconducting and hybrid qubits protected by construction against decoherence. It is part of a post-transmon strategy, alternative to surface code, in which the French teams are at the forefront. It brings together all of these teams around three complementary concepts: the Cat-code architecture, spin qubits implanted on superconducting circuits, and topologically protected superconducting qubits.
RobustSuperQ is a target project of the PEPR Quantum Technologies (priority programme for research & equipment),
part of the French National Quantum Strategy
WHAT WE DO
Assembling a superconducting circuit in cavity
@N.Hoppenot/ENS Lyon
We accelerate the French R&D on robust superconducting and hybrid qubits protected against decoherence. The project is organized into work packages (WP)
- WP0: Bricks of components and methods for WP1, 2 and 3.
- WP1: Cat-qubits encoding information in quantum superpositions of coherent microwave states.
- WP2: Dopant Spin qubits, encoding information in electronic and nuclear spins.
- WP3: Development of new qubits with topological protection.
- WP4: Creation and modernization of two manufacturing platforms* for superconducting qubits, and project coordination.
*Platforms: The two technical poles in the field, Ile-de-France and Grenoble, will make a qualitative leap in terms of resources, via the creation at CEA-Université Paris-Saclay of a new dedicated platform, and the acquisition of fabrication and characterization tools in the two poles. The resources will be pooled and interoperable, and the synergy of know-how and associated processes will be maximized.