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We demonstrate robust and efficient routing of single photons using a microtoroidal cavity QED system. Single photons from a coherent input are sorted to one output of the fiber with excess photons redirected to the other.
Thermal phase noise in optical interferometry can be compensated by exploiting coherence for underlying stochastic displacements and strains. The phase upon reflection from a fluctuating mirror's surface can thereby have reduced sensitivity to thermal noise.
We report entanglement generation in atomic quantum memories via deterministic mapping of photonic entanglement. The atomic entanglement is retrieved back into photon modes after a programmable storage time, with an overall efficiency of 17%.
Entanglement is generated by path-erasing detection of single photon emitted indistinguishably by two atomic ensembles. We characterize relationship of degree of entanglement to local dephasing. Parallel pairs of entanglement are distributed to polarization entanglement via conditional control.
Quantum networks hold the promise for revolutionary advances in information processing with entanglement distributed over remote locations via quantum repeaters. We report two milestones in this direction: the conditional control of memories and the implementation of functional nodes.
We report the observation of heralded entanglement between remote atomic ensembles. The detection of an emitted photon projects the ensembles into an entangled state with one joint excitation stored in the whole system.
We have observed photon blockade, as evidenced by the photon statistics for light transmitted by an optical cavity containing one trapped atom. The measurements also reveal the energy distribution for atomic motion in the trap.
We report a dramatic improvement of the degree of nonclassical correlation between photon pairs generated by a cold atomic ensemble. The temporal dependence of this correlation and the influence of decoherence are described
We consider cavity QED with single-photon Rabi frequency comparable to the hyperfine splitting of the atom's excited levels. We discuss experimental progress towards relevant measurements
Optically trapped atoms in the strong coupling regime of cavity QED have been used to generate single photons deterministically. Referenced to the total cavity output, the generation efficiency for polarized photons is 16%
Abstract. We report the use of broadband heterodyne spectroscopy to perform continuous measurement of the interaction energy Eint between one atom and a high-finesse optical cavity, during individual transit events of 250s duration. We achieve a fractional sensitivity 410-4/ to variations in Eint/? within a measurement bandwidth that covers 2.5 decades of frequency (1300kHz). Our basic procedure...
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