Quantum interface between light and a one-dimensional atomic system

A high-fidelity and large-scale reconfigurable photonic processor for NISQ applications

“…Mature technologies for controlling their creation, propagation, and detection are now available, or on the cusp of becoming useful. They also allow to interface between other quantum platforms like ions [1], neutral atoms [2], spin [3] and superconducting qubits [4]. Taken together, these properties give them a unique standing in the development of applications in the NISQ era and beyond.…”

Single collective excitation of an atomic array trapped along a waveguide: a study of cooperative emission for different atomic chain configurations

“…The quantization axis is taken along the axis of the waveguide, following the approach of Ref. [20], which is a practical configuration for a tripod scheme, and offers the benefits of a cylindrical symmetry 1 . The atoms are all prepared in the |F 0 , +1 state (spin oriented along the waveguide).…”

“…We considered here only the transformation of pure states, but the derivation can be straightforwardly generalized towards transformation of an arbitrary initial mixed state ρ(0). The evolution operator U (t, 0) can be found in previous work [20,[22][23][24][25] and is summarized in Appendix A.…”

“…The resolvent operator (A3) can be evaluated with the invariant perturbation theory technique and with the Feynman diagram method. We refer the reader to the supplementary materials in [20,[22][23][24][25] for a detailed presentation of the calculation approach. Here we only outline the most important calculation steps.…”