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Violation of Bell's Inequality under Strict Einstein Locality Conditions
We observe strong violation of Bell's inequality in an Einstein-Podolsky-Rosen-type experiment with independent observers. Our experiment definitely implements the ideas behind the well-known work by…
Quantum repeaters based on atomic ensembles and linear optics
The theoretical and experimental status quo of this very active field of quantum repeater protocols is reviewed, and the potentials of different approaches are compared quantitatively, with a focus on the most immediate goal of outperforming the direct transmission of photons.
Multimode quantum memory based on atomic frequency combs
An efficient multimode quantum memory is a crucial resource for long-distance quantum communication based on quantum repeaters. We propose a quantum memory based on spectral shaping of an…
Towards quantum superpositions of a mirror.
An experiment for creating quantum superposition states involving of the order of 10(14) atoms via the interaction of a single photon with a tiny mirror using a combination of state-of-the-art technologies is proposed.
A solid-state light–matter interface at the single-photon level
The coherent and reversible mapping of a light field with less than one photon per pulse onto an ensemble of ∼107 atoms naturally trapped in a solid is demonstrated by coherently absorbing the light field in a suitably prepared solid-state atomic medium.
Giant optical nonlinearity induced by a single two-level system interacting with a cavity in the Purcell regime
A two-level system that is coupled to a high-finesse cavity in the Purcell regime exhibits a giant optical nonlinearity due to the saturation of the two-level system at very low intensities, of the…
Robust long-distance entanglement and a loophole-free bell test with ions and photons.
The use of two-photon interference allows entanglement distribution free of interferometric sensitivity to the path length of the photons, and opens up the possibility of a loophole-free test of Bell's inequalities.
Polarization entanglement purification using spatial entanglement.
Surprisingly, spatial entanglement as an additional resource also leads to a substantial improvement in entangling output compared to the previous scheme, which relied on ideal single-pair sources.
Entanglement purification for quantum communication
This work presents a scheme for the entanglement purification of general mixed entangled states, which achieves 50 per cent of the success probability of schemes based on the CNOT operation, but requires only simple linear optical elements.
Practical private database queries based on a quantum-key-distribution protocol
This work proposes to implement private queries based on a quantum-key-distribution protocol, with changes only in the classical postprocessing of the key, which makes the scheme both easy to implement and loss tolerant.