Work

A Temperature‐Insensitive Optical Fiber Delay for Indistinguishability‐Preserving Multiplexing of Photons

Year: 2025

Type: article

Abstract: Quantum state purity, namely indistinguishability, of photons having different propagation histories is a prerequisite of multiphoton quantum information processing such as quantum networking and quantum computing. Although photonic multiplexing techniques using optical fiber delays can enhance the scalability of quantum states, the sensitivity of optical fibers to ambient temperature fluctuations deteriorates the indistinguishability of photons. This work demonstrates a novel optical differential delay using polarization‐maintaining fibers, which suppresses temperature dependence by balancing thermal expansion with modal dispersion in a fully passive mechanism. Time‐multiplexed Hong–Ou–Mandel interferometry under temperature variations from 24 to 50 °C verifies the effectiveness of the devised structure in a practical quantum photonics environment.

Source: Advanced Quantum Technologies

DOI: 10.1002/qute.202400512

Authors: Eun Chae Ha, Young Hoon Kim, Hee Su Park, Kwang Yong Song

Institutions: Korea Research Institute of Standards and Science, Chung-Ang University

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,430

Funders: Korea Research Institute of Standards and Science, National Research Council of Science and Technology