Abstract
Security certification of quantum key distribution (QKD) systems under practical conditions is necessary for social deployment. This article focused on the transmitter, and, in particular, investigated the intensity fluctuation of the optical pulses emitted by a gain-switched semiconductor laser used in QKD systems implementing decoy-BB84 protocol. A large intensity fluctuation was observed for low excitation, showing strong negative correlation between the adjacent pulses, which would affect the final key rate. The fluctuation decreased and the correlation disappeared as excitation increased. Simulation with rate equations successfully reproduced the experimental results and revealed that the large fluctuation originates from an intrinsic instability of gain-switched lasers driven periodically at a rate comparable to the inverse of carrier lifetime, as in GHz-clock QKD systems. Methods for further reduction of the intensity fluctuation were also discussed.
Highlights
Graduate School of Science, Kyoto University 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Macroscopic Quantum Coherence Research Team, RIKEN CEMS 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Superconducting Quantum Simulation Research Team, RIKEN CEMS 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Superconducting Quantum Simulation Research Team, RIKEN CEMS 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Superconducting Quantum Simulation Research Team, RIKEN CEMS 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Superconducting Quantum Simulation Research Team, RIKEN CEMS
フェルミオン171Yb原子を用いた1S0-3P2状態 Feshbach分子の生成 Production of Feshbach molecules in the 1S0-3P2 state of Fermionic 171Yb atoms 2電子原子を用いた量子気体顕微鏡の開発 - 2次元光格子中の冷却イッテルビウ ム 原子の高分解能イメージング Quantum Gas Microscope of Two-electron Atoms – high-resolution imaging of ultracold ytterbium atoms in a 2D optical lattice 超高分解能レーザー分光による有限温度ボース・ハバード系の研究 Study of finite-temperature Bose-Hubbard model using ultra-highresolution laser spectroscopy 光Lieb格子中に導入された冷却イッテルビウムのボース原子系の振舞い Behaviors of Cold Bosonic Ytterbium Atoms Loaded into an Optical Lieb Lattice 量子ゼノ効果による3次元光格子中でのYb原子^3P2状態の強相関状態の生成 Strongly Correlated System of Yb Atoms in the ^3P2 State in a 3D Optical Lattice Induced by Quantum Zeno Effect
Josephson Parametric Phase-locked Oscillator and Its Application to Quantum Information Processing
Summary
Graduate School of Science, Kyoto University 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Macroscopic Quantum Coherence Research Team, RIKEN CEMS 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Superconducting Quantum Simulation Research Team, RIKEN CEMS 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Superconducting Quantum Simulation Research Team, RIKEN CEMS 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Superconducting Quantum Simulation Research Team, RIKEN CEMS 理化学研究所 創発物性科学研究センター 超伝導量子シミュレーション研究チーム Superconducting Quantum Simulation Research Team, RIKEN CEMS. 所属 Affiliation March 25 量子セキュアネットワーク/Quantum Secure Network 波長多重型 量子鍵配送装置 Quantum key distribution system using wavelength division multiplexing 量子鍵を使ったセキュア通信 High speed prototype quantum key distribution system and log term field trial 量子暗号鍵配送装置に用いる利得スイッチ半導体レーザの強度揺らぎ Intensity fluctuation of a gain-switched semiconductor laser for a quantum key distribution system 高速動作する連続変数量子鍵配送装置の開発
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