Abstract
Quantum‐state decoherence is the major obstacle to the implementation of quantum computing and quantum information. Here we present an experimental proof of principle for the quantum engineering of decohering interactions. An optically generated Einstein‐Podolski‐Rosen (EPR) entangled state was subjected to severe loss by placing a 50% beam splitter in the path of each entangled light beam. The resulting severe degradation of the signature quantum correlations between the two beams was subsequently alleviated when another, independent EPR state impinged upon the other input ports of the beam splitter, effectively entangling the losses inflicted to the initial EPR state. The additional EPR beam pair was classically coherent with the primary one but had no quantum correlations with it. This result may also find application as a “quantum tap” for entanglement.
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