



@article {2365,
	title = {Heisenberg-Scaling Measurement Protocol for Analytic Functions with Quantum Sensor Networks},
	journal = {Phys. Rev. A},
	volume = {100},
	year = {2019},
	month = {10/7/2019},
	abstract = {<p>We generalize past work on quantum sensor networks to show that, for d input parameters, entanglement can yield a factor O(d) improvement in mean squared error when estimating an analytic function of these parameters. We show that the protocol is optimal for qubit sensors, and conjecture an optimal protocol for photons passing through interferometers. Our protocol is also applicable to continuous variable measurements, such as one quadrature of a field operator. We outline a few potential applications, including calibration of laser operations in trapped ion quantum computing.</p>},
	doi = {https://doi.org/10.1103/PhysRevA.100.042304},
	url = {https://arxiv.org/abs/1901.09042},
	author = {Kevin Qian and Zachary Eldredge and Wenchao Ge and Guido Pagano and Christopher Monroe and James V. Porto and Alexey V. Gorshkov}
}
@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}
}
