Entanglement generation using a controlled-phase gate for time-bin qubits. (24th August 2018)

• Record Type: Journal Article
• Authors: Lo, Hsin-Pin; Ikuta, Takuya; Matsuda, Nobuyuki; Honjo, Toshimori; Takesue, Hiroki
• Is Part Of: Applied physics express. Volume 11:Number 9(2018)
• Publication Date: 2018-08-24
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.11.092801
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: Quantum logic gates are important for quantum computation and quantum information processing in numerous physical systems. Although time-bin qubits are suitable for quantum communication over optical fiber, many essential quantum logic gates for them have not yet been realized. Here, we demonstrated a controlled-phase (C-Phase) gate for time-bin qubits that uses a 2 × 2 optical switch based on an electro-optic modulator. A Hong–Ou–Mandel interference measurement showed that the switch could work as a time-dependent beam splitter with a variable splitting ratio. We confirmed that two independent time-bin qubits were entangled as a result of C-Phase gate operation with the switch.