Frequency-bin qubits possess unique synergies with wavelength-multiplexed lightwave communications, suggesting valuable opportunities for quantum networking with the existing fiber-optic infrastructure. Although the coherent manipulation of frequency-bin states requires highly controllable multi-spectral-mode interference, the quantum frequency processor (QFP) provides a scalable path for gate synthesis leveraging standard telecom components. Here, we summarize the state of the art in experimental QFP characterization. Distinguishing between physically motivated “open box” approaches that treat the QFP as a multiport interferometer, and “black box” approaches that view the QFP as a general quantum operation, we highlight the assumptions and results of multiple techniques, including quantum process tomography of a tunable beamsplitter—to our knowledge the first full process tomography of any frequency-bin operation. Our findings should inform future characterization efforts as the QFP increasingly moves beyond proof-of-principle tabletop demonstrations toward integrated devices and deployed quantum networking experiments.
Lu, Hsuan-Hao, et al. "Characterization of Quantum Frequency Processors." IEEE Journal of Selected Topics in Quantum Electronics, vol. 29, no. 6: Photonic Signal Processing, Apr. 2023. https://doi.org/10.1109/jstqe.2023.3266662
Lu, Hsuan-Hao, Peters, Nicholas A., Weiner, Andrew M., & Lukens, Joseph M. (2023). Characterization of Quantum Frequency Processors. IEEE Journal of Selected Topics in Quantum Electronics, 29(6: Photonic Signal Processing). https://doi.org/10.1109/jstqe.2023.3266662
Lu, Hsuan-Hao, Peters, Nicholas A., Weiner, Andrew M., et al., "Characterization of Quantum Frequency Processors," IEEE Journal of Selected Topics in Quantum Electronics 29, no. 6: Photonic Signal Processing (2023), https://doi.org/10.1109/jstqe.2023.3266662
@article{osti_1986227,
author = {Lu, Hsuan-Hao and Peters, Nicholas A. and Weiner, Andrew M. and Lukens, Joseph M.},
title = {Characterization of Quantum Frequency Processors},
annote = {Frequency-bin qubits possess unique synergies with wavelength-multiplexed lightwave communications, suggesting valuable opportunities for quantum networking with the existing fiber-optic infrastructure. Although the coherent manipulation of frequency-bin states requires highly controllable multi-spectral-mode interference, the quantum frequency processor (QFP) provides a scalable path for gate synthesis leveraging standard telecom components. Here, we summarize the state of the art in experimental QFP characterization. Distinguishing between physically motivated “open box” approaches that treat the QFP as a multiport interferometer, and “black box” approaches that view the QFP as a general quantum operation, we highlight the assumptions and results of multiple techniques, including quantum process tomography of a tunable beamsplitter—to our knowledge the first full process tomography of any frequency-bin operation. Our findings should inform future characterization efforts as the QFP increasingly moves beyond proof-of-principle tabletop demonstrations toward integrated devices and deployed quantum networking experiments.},
doi = {10.1109/jstqe.2023.3266662},
url = {https://www.osti.gov/biblio/1986227},
journal = {IEEE Journal of Selected Topics in Quantum Electronics},
issn = {ISSN 1077-260X},
number = {6: Photonic Signal Processing},
volume = {29},
place = {United States},
publisher = {IEEE Lasers and Electro-optics Society},
year = {2023},
month = {04}}
