



@article {2575,
	title = {The Character of Motional Modes for Entanglement and Sympathetic Cooling of Mixed-Species Trapped Ion Chains},
	year = {2020},
	month = {4/16/2020},
	abstract = {<p>Modular mixed-species ion-trap networks are a promising framework for scalable quantum information processing, where one species acts as a memory qubit and another as a communication qubit. This architecture requires high-fidelity mixed-species entangling gates to transfer information from communication to memory qubits through their collective motion. We investigate the character of the motional modes of a mixed-species ion chain for entangling operations and also sympathetic cooling. We find that the laser power required for high-fidelity entangling gates based on transverse modes is at least an order of magnitude higher than that based on axial modes for widely different masses of the two species. We also find that for even moderate mass differences, the transverse modes are much harder to cool than the axial modes regardless of the ion chain configuration. Therefore, transverse modes conventionally used for operations in single-species ion chains may not be well suited for mixed-species chains with widely different masses.</p>},
	url = {https://arxiv.org/abs/2004.08045},
	author = {Ksenia Sosnova and Allison Carter and Christopher Monroe}
}
@article {2302,
	title = {High Purity Single Photons Entangled with an Atomic Memory},
	year = {2018},
	abstract = {<p>Trapped atomic ions are an ideal candidate for quantum network nodes, with long-lived identical qubit memories that can be locally entangled through their Coulomb interaction and remotely entangled through photonic channels. The integrity of this photonic interface is generally reliant on purity of single photons produced by the quantum memory. Here we demonstrate a single-photon source for quantum networking based on a trapped 138Ba+ ion with a single photon purity of g2(0)=(8.1\&plusmn;2.3)\&times;10\&minus;5 without background subtraction. We further optimize the tradeoff between the photonic generation rate and the memory-photon entanglement fidelity for the case of polarization photonic qubits by tailoring the spatial mode of the collected light.\&nbsp;</p>},
	url = {https://arxiv.org/abs/1812.01749},
	author = {Clayton Crocker and Martin Lichtman and Ksenia Sosnova and Allison Carter and Sophia Scarano and Christopher Monroe}
}
