Amending entanglement-breaking channels via intermediate unitary operations

Abstract

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.

arXiv comment5 pages, 4 figures (three of them containing two internal images) and 1 table

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• Entanglement Protection via Periodic Environment Resetting in Continuous Time Quantum Dynamical Processes
• Asymptotic Dynamics of Open Quantum Systems and Modular Theory
• Experimental Lower Bounds to the Classical Capacity of Quantum Channels
• Amending coherence-breaking channels via unitary operations
• Entanglement-breaking of quantum dynamical channels