Reversing Quantum Nondemolition Interaction as Quantum Erasing

Details Reversing Quantum Nondemolition Interaction as Quantum Erasing Reversing Quantum Nondemolition Interaction as Quantum Erasing

2010-07-02

arxiv.org/abs/1007.0314v4

Physics

Quantum Physics

10 pages, 8 figures

Scientific paper

We reverse a quantum nondemolition (QND) interaction and restore the signal quantum state by measurement and feedforward. This operation corresponds to quantum erasing for continuous variables (CVs). CV quantum eraser restores the coherence of the signal quantum state by erasing the signal information leaking to another system, where the information leaking is induced by the QND interaction. We employ a homodyne measurement for erasing of the information. Then, by performing a feedforward displacement operation, we restore the initial quantum state together with its coherence. For verification, we use a coherent state and a squeezed vacuum state as inputs, and then restore one of them or the other, whichever we choose. Experimental results are shown as Wigner functions, average fidelity, change in coherence, and trade-off between leakage information and coherence.

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