2010/07/02 by Yoshichika Miwa, Jun–ichi Yoshikawa, Jun-ichi Yoshikawa +8
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Neural Networks and Reservoir Computing #Quantum Information and Cryptography #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.1007.0314
10 pages, 8 figures
openalex publication_date 2010/07/02 · arxiv created 2011/03/03 · arxiv updated 2011/03/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.