2021/09/14 by Navin B. Lingaraju, Hsuan‐Hao Lu, Hsuan-Hao Lu +4
Computer Science · Physics and Astronomy · #Acoustics #Algorithm #Bell state #Computer science #Fourier transform #Hadamard transform #High fidelity #Neural Networks and Reservoir Computing #Optics #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum mechanics #Qubit #Spectrum analyzer #State (computer science) #physics.optics #quant-ph
paper · pdf · open access · doi:10.1364/optica.443302
published in Optica 9(3), 280 (Optica Publishing Group) · 5 pages, 3 figures
arxiv created 2021/09/14 · openalex publication_date 2022/01/26 · arxiv updated 2022/03/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We demonstrate a Bell state analyzer that operates directly on frequency mismatch. Based on electro-optic modulators and Fourier-transform pulse shapers, our quantum frequency processor design implements interleaved Hadamard gates in discrete frequency modes. Experimental tests on entangled-photon inputs reveal accuracies of ∼98% for discriminating between the |Ψ+⟩ and |Ψ-⟩ frequency-bin Bell states. Our approach resolves the tension between wavelength-multiplexed state transport and high-fidelity Bell state measurements, which typically require spectral indistinguishability.