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Quantum-enhanced measurement of magnetic fields

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Controlled interaction between single atoms and single photons is a key tool in quantum networking, required to implement, for example, a quantum repeater. I will describe recent experiments where single trapped ions emit single-mode coupled, bandwidth-tunable single photons at high rate, and where single ions interact with single photons from a SPDC photon pair source. In the latter experiment, absorption of a single photon is signaled by a quantum jump in the ion, while it is heralded by the photon’s entangled partner [1]. Entanglement is preserved in the heralded absorption process. [1] N. Piro et al., Nature Physics 7, 17 (2011).

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