Amending entanglement-breaking channels via intermediate unitary operations

Á Cuevas, A. De Pasquale, A. Mari, A. Orieux, S. Duranti, M. Massaro, A. Di Carli, E. Roccia, J. Ferraz, F. Sciarrino, P. Mataloni, V. Giovannetti

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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.

Original languageEnglish
Article number022322
Number of pages5
JournalPhysical Review A
Issue number2
Publication statusPublished - 23 Aug 2017


  • quantum communication channels
  • single qubit channels
  • single photons

Cite this

Cuevas, Á., De Pasquale, A., Mari, A., Orieux, A., Duranti, S., Massaro, M., Di Carli, A., Roccia, E., Ferraz, J., Sciarrino, F., Mataloni, P., & Giovannetti, V. (2017). Amending entanglement-breaking channels via intermediate unitary operations. Physical Review A, 96(2), [022322].