2017/02/07 by Young-Sik Ra, Clément Jacquard, Adrien Dufour +2 · 47 citations
Computer Science · Physics and Astronomy · #Adder #Beam splitter #CMOS #Coherent states #Optics #Optoelectronics #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum mechanics #Quantum optics and atomic interactions #Quantum state #Qubit #Squeezed coherent state #Subtractor #Superposition principle #quant-ph
paper · pdf · doi:10.1103/physrevx.7.031012
published in Physical Review X 7(3) (American Physical Society)
arxiv created 2017/02/07 · openalex publication_date 2017/07/19 · arxiv updated 2017/07/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Single-photon subtraction plays important roles in optical quantum information processing as it provides a non-Gaussian characteristic in continuous-variable quantum information. While the conventional way of implementing single-photon subtraction based on a low-reflectance beam splitter works properly for a single-mode quantum state, it is unsuitable for a multimode quantum state because a single photon is subtracted from all multiple modes without maintaining their mode coherence. Here, we experimentally implement and characterize a mode-tunable coherent single-photon subtractor based on sum-frequency generation. It can subtract a single photon exclusively from one desired time-frequency mode of light or from a coherent superposition of multiple time-frequency modes. To experimentally characterize the time-frequency modes of the single-photon subtractor, we employ quantum process tomography based on coherent states. The mode-tunable coherent single-photon subtractor will be an essential element for realizing non-Gaussian quantum networks necessary to get a quantum advantage in information processing.