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arXiv:1810.09642 · International Journal of Theoretical Physics

Amending Coherence-Breaking Channels via Unitary Operations

Long-Mei Yang, Bin Chen, Tao Li, Shao-Ming Fei, Zhi‐Xi Wang

Published Sep 22, 2018• 2 citations
arXivHTMLPDF
DOI
10.1007/s10773-018-3890-4

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We report a bulk optics experiment demonstrating the possibility of restoring the entanglement distribution through noisy quantum channels by inserting a suitable unitary operation (filter) in the middle of the transmission process. We focus on two relevant classes of single-qubit channels consisting in repeated applications of rotated phase-damping or rotated amplitude-damping maps, both modeling the combined Hamiltonian and dissipative dynamics of the polarization state of single photons. Our results show that interposing a unitary filter between two noisy channels can significantly improve entanglement transmission. This proof-of-principle demonstration could be generalized to many other physical scenarios where entanglement-breaking communication lines may be amended by unitary filters.