Symmetry protection

Symmetries play a fundamental role in physics, determining how a system behaves under specific transformations. When carefully engineered, they can make a system naturally resistant to disturbances, preventing it from changing state even in the presence of noise.

By designing short chains of qubits with a high degree of symmetry, we create an intrinsically protected logical qubit that is naturally resilient to the main sources of relaxation and decoherence, enhancing coherence by orders of magnitude without significant hardware overhead.

This protected logical qubit can be realized with a superconducting circuit using a small number of Josephson junctions and provides a possible route toward robust, scalable quantum computing.