Fano-qubits for quantum devices with enhanced isolation and bandwidth

Quantum devices often suffer from reflections and noise during readout, a problem traditionally addressed by magneto-optical isolators circulators. However, these solutions are hindered limited bandwidth, low tunability, high losses, incompatibility with planar technologies like circuit QED. To overcome challenges, we introduce an approach to quantum non-reciprocity, leveraging the inherent nonlinearity of qubits spatial symmetry disruption. Our method transforms Lorentz-type into one Fano-type qubits, which exhibit asymmetric spectral response. This transformation leads significant enhancement in isolation (up 40 dB) doubling bandwidth 200 MHz). We base our analysis on realistic parameters substantiate it existing experimental results comprehensive simulations. research paves way for creating compact, high-performance, planar-compatible non-reciprocal devices. These could revolutionize computing, communication, sensing offering improved protection broader bandwidth.