Strong coupling of two individually controlled atoms via a nanophotonic cavity

We demonstrate photon-mediated interactions between two individually trapped atoms coupled to a nanophotonic cavity. Specifically, we observe collective enhancement when the atoms are resonant with the cavity and level repulsion when the cavity is coupled to the atoms in the dispersive regime. Our approach makes use of individual control over the internal states of the atoms and their position with respect to the cavity mode, as well as the light shifts to tune atomic transitions individually, allowing us to directly observe the anticrossing of the bright and dark two-atom states. These observations open the door for realizing quantum networks and studying quantum many-body physics based on atom arrays coupled to nanophotonic devices. ©2020 Keywords: cavity quantum electrodynamics; collective effects in quantum optics; hybrid quantum systems; quantum control; quantum optics; superradiance & subradianceCenter for Ultracold Atoms (grant no. PHY-1125846)National Science Foundation (grant no. PHY-1506284)AFOSR (grant no. FA9550-16-1-0323)Vannevar Bush Faculty Fellowship (grant no. N00014-15-1-2846)ARL CDQI (grant no. W911NF1520067

Entanglement transport and a nanophotonic interface for atoms in optical tweezers

Quantum trapping and shuffling Programmable arrays of atoms or ions trapped in optical potentials have recently emerged as a leading platform for quantum simulation. Being able to interface into these arrays to access the quantum information being processed and pass it along to another module remains a challenge. Ðorđević et al . developed a hybrid quantum system that combines atoms held in optical tweezers and a nanophotonic cavity to demonstrate full quantum control, efficient quantum nondestructive readout, and entanglement of atom pairs (see the Perspective by Kaufman). By combining atomic manipulation both inside and away from the cavity field and shuffling the atom qubits into and out of the cavity mode, the authors demonstrate a viable optical interface that could be scaled to larger systems. —ISO </jats:p