Heralded multiphoton states with coherent spin interactions in waveguide QED
Paulisch, V., Gonzalez-Tudela, A., Kimble, H., Cirac, J. · MPG.PuRe (Max Planck Society) · 2017
Waveguide QED offers the possibility of generating strong coherent atomic interactions either through appropriate atomic configurations in the dissipative regime or in the bandgap regime.In this work, we show how to harness these interactions in order to herald the generation of highly entangled atomic states, which afterwards can be mapped to generate single mode multi-photonic states with high fidelities.We introduce two protocols for the preparation of the atomic states, we discuss their performance and compare them to previous proposals.In particular, we show that one of them reaches high probability of success for systems with many atoms but low Purcell factors.The key resource of these protocols is the long-range dissipative coupling induced by the waveguide which enforces effective unitary dynamics through the quantum Zeno effect.In this work, we present two protocols that harness long-range coherent interactions induced by the guided modes to generate collective atomic excitations within an ensemble of atoms.• The first protocol ('double mirrors') is designed for emitters, whose resonance frequency corresponds to some guided mode in the band, see figure 1(a), and which is, e.g., well suited for optical fiber setups.In this case, the