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Abstract: We reverse a quantum nondemolition QND interaction and restore the signalquantum state by measurement and feedforward. This operation corresponds toquantum erasing for continuous variables CVs. CV quantum eraser restores thecoherence of the signal quantum state by erasing the signal information leakingto another system, where the information leaking is induced by the QNDinteraction. We employ a homodyne measurement for erasing of the information.Then, by performing a feedforward displacement operation, we restore theinitial quantum state together with its coherence. For verification, we use acoherent state and a squeezed vacuum state as inputs, and then restore one ofthem or the other, whichever we choose. Experimental results are shown asWigner functions, average fidelity, change in coherence, and trade-off betweenleakage information and coherence.

Autor: Yoshichika Miwa, Jun-ichi Yoshikawa, Ryuji Ukai, Radim Filip, Akira Furusawa


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