Ultrafast Quantum Nanophotonics
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 . I will also overview other important components in nanophotonic LN including intense optical parametric amplifiers , ultrafast ultra-low-energy all-optical switches , and ultrabroadband coherent sources [4, 5]. I will discuss the ongoing efforts and the outlook towards generation of non-Gaussian states and large-scale quantum nanophotonic circuits.
 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).
 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).
 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).
 A. Roy, L. Ledezma, L. Costa, R. Gray, R. Sekine, Q. Guo, M. Liu, R. M. Briggs, A. Marandi, “Visible-to-mid-IR tunable frequency comb in nanophotonics,” (arXiv:2212.08723).
 L. Ledezma, A. Roy, L. Costa, R. Sekine, R. Gray, Q. Guo, R. Nehra, R. M. Briggs, A. Marandi, “Octave-spanning tunable infrared parametric oscillators in nanophotonics,” Science Advances 9, eadf9711 (2023).
Bio: Alireza Marandi is an Assistant Professor of Electrical Engineering and Applied Physics at Caltech. He received his PhD from Stanford University in 2013. Before joining Caltech, he held positions as a postdoctoral scholar and a research engineer at Stanford, a visiting scientist at the National Institute of Informatics in Japan, and a senior engineer in the Advanced Technology Group of Dolby Laboratories. Marandi is a Senior Member of OSA and IEEE and has been the recipient of NSF CAREER award, the AFOSR YIP award, ARO Early Career Award, and the Young Scientist Prize of the IUPAP. He is named the 2019 KNI-Wheatley Scholar and a 2023 Sloan Foundation Fellow.
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