Quantum Fredkin and Toffoli gates on a versatile programmable silicon photonic chip

Yuan Li, Lingxiao Wan, Hui Zhang, Huihui Zhu, Yuzhi Shi, Lip Ket Chin, Xiaoqi Zhou, Leong Chuan Kwek, Ai Qun Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


Quantum logic gates are backbones of quantum information processing (QIP), wherein the typical three-qubit Fredkin and Toffoli gates are essential in quantum computation and communication. So far, the quantum Fredkin gate has only been demonstrated with pre-entangled input states in free-space optics, which limits its usage for independent input photons. Here, we put forward an exquisite scheme and experimentally perform a proof-of-principle demonstration of three-qubit Fredkin and Toffoli gates on a programmable quantum photonic chip. Our scheme can also be used to realize a series of other two-qubit quantum gates. Our work sheds light on the merits of quantum photonic chip in implementing quantum logic gates, and paves the way for advanced quantum chip processors.

Original languageEnglish
Article number112
Pages (from-to)1-7
Journalnpj Quantum Information
Issue number1
Publication statusPublished - Dec 2022
Externally publishedYes

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Statistical and Nonlinear Physics
  • Computer Networks and Communications
  • Computational Theory and Mathematics


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