Chiral waveguide QED with superconducting qubits

SPICE Workshop on Quantum Spinoptics, June 13th - 15th 2023

Mohammad Mirhosseini

Chiral light-matter interaction promises opportunities for developing quantum networks with long-range connectivity and generating many-body entanglement. This talk will present results on realizing a superconducting artificial atom with strong unidirectional coupling to a one-dimensional photonic waveguide. This artificial atom comprises a transmon qubit with time-modulated couplings to two points of a microwave coplanar waveguide. Direction-sensitive interference arising from the propagation delay and the parametric interactions in this scheme results in a non-reciprocal response, where we measure a forward/backward ratio of spontaneous emission exceeding 100. We will discuss future avenues for engineering waveguide QED systems based on chiral superconducting qubits, which may lead to a scalable realization of cascaded quantum systems.