Science Advances

Supplementary Materials

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  • Dephasing effect of PM optical fibers
  • Coherent information
  • Single-use channel capacity of the completely dephasing channel
  • Reconstruction of the density matrix χ
  • Unidirectional transfer
  • Fig. S1. Quantum state evolution of unidirectional information transfer in the case where the noise from the two fibers is perfectly correlated.
  • Fig. S2. Experimental results for the unidirectional transformation.
  • Fig. S3. Experimental results for the entangled input states, with one of the photons passing through the paired PM fibers.
  • Phase stabilization
  • Fig. S4. Envelope of two-photon coincidence counts by scanning of the piezo position.
  • Imaginary part of the density matrix χ
  • Related transmission methods
  • Fig. S5. Experimental results for the imaginary parts of the density matrixes χ.
  • Fig. S6. For postselection free unidirectional transmission of quantum information with a single PM fiber, active components (for example, electronic half-wave plates) and accurate active control systems are needed.
  • Fig. S7. For postselection free bidirectional transmission of quantum information with a single PM fiber, active components (for example, electronic half-wave plates) and accurate active control systems are needed.
  • Comparison with the active single PM fiber case

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