RQC Seminar

112nd RQC Seminar

  • Speaker

    Prof. Alireza Marandi
    ( California Institute of Technology, US )

  • Date

    16:00-17:00, April 25, 2024 (Thursday)

  • Venue

    Hybrid(ZOOM・ Wako Main Research 3F 345-347 Seminar Room/ 研究本館3階 セミナー室(345-347) C01）

  • Title

    Ultrafast Quantum Nanophotonic Circuits

  • Inquiries

    rqc_info[at]ml.riken.jp

Abstract
Despite tremendous progress on quantum optics using table-top experiments, in nanophotonics, it remains challenging to generate, manipulate, and measure quantum states with the performance required for a wide range of quantum information systems. Utilizing few-optical-cycle pulses in lithium niobate nanophotonics not only promises a path for addressing this challenge it also enables realization of ultrafast quantum information processors with THz clock rates. In this talk, I will present the experimental progress towards such processors including the recent results on generation and measurement of squeezed states on a single chip with about 5 dB of squeezing and spanning more than 25 THz of bandwidth [1]. I will also overview other important components in nanophotonic LN including intense optical parametric amplifiers [2], ultrafast ultra-low-energy all-optical switches [3], and ultrafast mode-locked lasers [4]. I will discuss the ongoing efforts and the outlook towards generation of non-Gaussian states and large-scale quantum nanophotonic circuits.


References:
[1] R. Nehra, R. Sekine, L. Ledezma, Q. Guo, R. M. Gray, A. Roy, A. Marandi, “Few-cycle vacuum squeezing in nanophotonics,” Science 377, 1333–1337 (2022).
[2] L. Ledezma, R. Sekine, Q. Guo, R. Nehra, S. Jahani, A. Marandi, “Intense optical parametric amplification in dispersion engineered nanophotonic lithium niobate waveguides,” Optica 9 (3), 303-308 (2022).
[3] Q. Guo, R. Sekine, L. Ledezma, R. Nehra, D. J. Dean, A. Roy, R. M. Gray, S. Jahani, A. Marandi, “Femtojoule femtosecond all-optical switching in lithium niobate nanophotonics,” Nature Photonics 16, 625–631 (2022).
[4] Q. Guo, B. K. Gutierrez, R. Sekine, R. M. Gray, J. A. Williams, L. Ledezma, L. Costa, A. Roy, S. Zhou, M. Liu, A. Marandi, “Ultrafast mode-locked laser in nanophotonic lithium niobate,” Science 382, 708-713 (2023).




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