Robust Superconducting and hybrid Quantum bits
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Taha Bouwakdh, on his PhD subject :
My PhD project focuses on developping a Josephson metamaterial-based circuit that, in the presence of a microwave pump, implements an on-chip frequency-tunable circulator, in the continuity of previous implementations within the group (Praquin et al., arXiv:2406.19751). The investigated circuits explore a regime of traveling wave conversion where the signal and idler propagate in opposite directions creating robust on chip isolation. In order to improve the performance beyond the state of the art in terms of isolation and insertion loss, I will be designing and testing alternative architectures, mainly focusing on flux-pumped three-wave mixing devices. Finally, the goal would be to integrate this circulator into a high-coherence superconducting circuit to realize an error-protected qubit based on the previous proposal (Rymarz et al., PRX 2021), which involves connecting two Josephson junctions via an idealized non-reciprocal element.
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.