Memory effects in quantum information transmission across a Hamiltonian dephasing channel

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Abstract.

We study a dephasing channel with memory, modelled by a multimode environment of oscillators. Focusing on the case of two channel uses, we show that memory effects can enhance the amount of coherent quantum information transmitted down the channel. We also propose a coding-decoding scheme that takes advantage of memory to improve the fidelity of transmission.

Keywords

European Physical Journal Special Topic Input State Quantum Capacity Coherent Information Kraus Representation 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  1. 1.Catania & Dipartimento di Metodologie Fisiche e Chimiche per l'Ingegneria, Università degli Studi di CataniaMATIS, CNR-INFMCataniaItaly
  2. 2.CNISM, CNR-INFM & Center for Nonlinear and Complex Systems, Universita' degli Studi dell'InsubriaComoItaly
  3. 3.Istituto Nazionale di Fisica Nucleare, Sezione di Milano, via Celoria 16MilanoItaly

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