Building a controlled-NOT gate between polarization and frequency

• URL: http://arxiv.org/abs/2404.07317v1
• Date: Wed, 10 Apr 2024 19:31:06 GMT
• Title: Building a controlled-NOT gate between polarization and frequency
• Authors: Hsuan-Hao Lu, Joseph M. Lukens, Muneer Alshowkan, Brian T. Kirby, Nicholas A. Peters,
• Abstract summary: We devise and realize a CNOT operation between polarization and frequency DoFs. We validate the effectiveness of this operation through the synthesis of all four Bell states in a single photon. This demonstration opens new avenues for manipulating hyperentanglement across these two crucial DoFs.
• Score: 0.5646167527990591
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: By harnessing multiple degrees of freedom (DoFs) within a single photon, controlled quantum unitaries, such as the two-qubit controlled-NOT (CNOT) gate, play a pivotal role in advancing quantum communication protocols like dense coding and entanglement distillation. In this work, we devise and realize a CNOT operation between polarization and frequency DoFs by exploiting directionally dependent electro-optic phase modulation within a fiber Sagnac loop. Alongside computational basis measurements, we validate the effectiveness of this operation through the synthesis of all four Bell states in a single photon, all with fidelities greater than 98%. This demonstration opens new avenues for manipulating hyperentanglement across these two crucial DoFs, marking a foundational step toward leveraging polarization-frequency resources in fiber networks for future quantum applications.

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