Researchers at the California Institute of Technology (Caltech) have demonstrated quantum entanglement for a quantum state stored in four spatially distinct atomic memories.
They also demonstrated a quantum interface between the atomic memories—which represent something akin to a computer "hard drive" for entanglement—and four beams of light, thereby enabling the four-fold entanglement to be distributed by photons across quantum networks. The research represents an important achievement in quantum information science by extending the coherent control of entanglement from two to multiple (four) spatially separated physical systems of matter and light.
Caltech's entanglement technique used lasers to cool the four quantum memories--each a collection of 1 million cesium atoms magnetically separated by 1 millimeter.
Next, the researchers want to study the dynamics of entanglement decay as applied to entangled spin waves in quantum magnetic memories. They also want to expand quantum "metrology" whereby quantum states can be generated, stored and transferred using measurements of the ordinarily fragile states of quantum memories.
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