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On-chip pulse shaping of entangled photons

Kaiyi Wu1,*,†, Lucas M. Cohen1,*,‡,§, Karthik V. Myilswamy1, Navin B. Lingaraju2, Hsuan-Hao Lu3, Joseph M. Lukens1,3,4, and Andrew M. Weiner1,¶

  • *These authors contributed equally to this work.
  • †Contact author: wu1871@purdue.edu
  • ‡Contact author: lmcohen@sandia.gov
  • §Present address: Photonic and Phononic Microsystems, Sandia National Laboratories, Albuquerque, NM 87123, USA.
  • Legacy.
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Phys. Rev. Research 7, 033015 – Published 2 July, 2025

DOI: https://doi.org/10.1103/kvcq-4zqc

Abstract

The miniaturization of optical systems via integrated photonics is critical to the ultimate scalability and performance of photonic quantum processors, yet many longstanding optical signal processing capabilities—such as Fourier-transform pulse shaping—remain unrealized on chip. In this work, we demonstrate on-chip spectral shaping of entangled photons using a multichannel microring-resonator-based silicon photonic pulse shaper. Achieving line-by-line phase control on a 3 GHz grid for two frequency-bin-entangled qudits, the pulse shaper's fine spectral resolution enables control of nanosecond-scale temporal features, which are observed by direct coincidence detection of biphoton correlation functions that show excellent agreement with theory. This work marks a demonstration of biphoton pulse shaping using an integrated spectral shaper and holds significant promise for applications in photonic quantum information processing.

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Phys. Rev. Research 7, 033015– Published 2 July, 2025
  • Received 21 October 2024
  • Accepted 20 May 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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