Coexistent quantum channel characterization using quantum process tomography with spectrally resolved detection

Joseph C. Chapman; Joseph M. Lukens; Muneer Alshowkan; Nageswara S. V. Rao; Brian T. Kirby; Nicholas A. Peters

doi:10.1117/12.2655801

8 March 2023 Coexistent quantum channel characterization using quantum process tomography with spectrally resolved detection

Joseph C. Chapman, Joseph M. Lukens, Muneer Alshowkan, Nageswara S. V. Rao, Brian T. Kirby, Nicholas A. Peters

Author Affiliations +

Proceedings Volume 12446, Quantum Computing, Communication, and Simulation III; 124460F (2023) https://doi.org/10.1117/12.2655801
Event: SPIE Quantum West, 2023, San Francisco, California, United States

Abstract

The coexistence of classical and quantum signals over the same optical fiber is critical for quantum networks operating within the existing communications infrastructure. Here, we characterize the quantum channel that results from distributing approximate single-photon polarization-encoded qubits simultaneously with classical light of varying intensities through a 25 km fiber-optic channel. We use spectrally resolved quantum process tomography with a newly developed Bayesian reconstruction method to estimate the quantum channel from experimental data, both with and without classical noise. Furthermore, we show that the coexistent fiber-based quantum channel has high process fidelity with an ideal depolarizing channel if the noise is dominated by Raman scattering. These results aid future development of quantum repeater designs and quantum error-correcting codes which benefit from realistic channel error models.

Conference Presentation

Citation Download Citation

Joseph C. Chapman, Joseph M. Lukens, Muneer Alshowkan, Nageswara S. V. Rao, Brian T. Kirby, and Nicholas A. Peters "Coexistent quantum channel characterization using quantum process tomography with spectrally resolved detection", Proc. SPIE 12446, Quantum Computing, Communication, and Simulation III, 124460F (8 March 2023); https://doi.org/10.1117/12.2655801

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