Dynamical photon–photon interaction mediated by a quantum emitter

Jeannic, H.L. and Tiranov, A. and Carolan, J. and Ramos, T. and Wang, Y. and Appel, M.H. and Scholz, S. and Wieck, A.D. and Ludwig, Ar. and Rotenberg, N. and Midolo, L. and García-Ripoll, J.J. and Sørensen, A.S. and Lodahl, P.

Volume: 18 Pages: 1191-1195
DOI: 10.1038/s41567-022-01720-x
Published: 2022

Single photons role in the development of quantum science and technology. They can carry quantum information over extended distances to act as the backbone of a future quantum internet1 and can be manipulated in advanced photonic circuits, enabling scalable photonic quantum computing2,3. However, more sophisticated devices and protocols need access to multi-photon states with particular forms of entanglement. Efficient light–matter interfaces offer a route to reliably generating these entangled resource states4,5. Here we utilize the efficient and coherent coupling of a single quantum emitter to a nanophotonic waveguide to realize a quantum nonlinear interaction between single-photon wavepackets. We demonstrate the control of a photon using a second photon mediated by the quantum emitter. The dynamical response of the two-photon interaction is experimentally unravelled and reveals quantum correlations controlled by the pulse duration. Further development of this platform work, which constitutes a new research frontier in quantum optics6, will enable the tailoring of complex photonic quantum resource states. © 2022, The Author(s), under exclusive licence to Springer Nature Limited.

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