Abstract

Loss is inevitable for the optical system due to the absorption of materials, scattering caused by the defects, and surface roughness. In quantum optical circuits, the loss can not only reduce the intensity of the signal, but also affect the performance of quantum operations. In this work, we divide losses into unbalanced linear losses and shared common losses, and provide a detailed analysis on how loss affects the integrated linear optical quantum gates. It is found that the orthogonality of eigenmodes and the unitary phase relation of the coupled waveguide modes are destroyed by the loss. As a result, the fidelity of single- and two-qubit operations decreases significantly as the shared loss becomes comparable to the coupling strength. Our results are important for the investigation of large-scale photonic integrated quantum information processes.

© 2017 Chinese Laser Press

Quantum circuit mapping for universal and scalable computing in MZI-based integrated photonics

Yong Kwon, Alessio Baldazzi, Lorenzo Pavesi, and Byung-Soo Choi
Opt. Express 32(7) 12852-12881 (2024)

Design and characterization of integrated components for SiN photonic quantum circuits

Menno Poot, Carsten Schuck, Xiao-song Ma, Xiang Guo, and Hong X. Tang
Opt. Express 24(7) 6843-6860 (2016)

Phase-controlled integrated photonic quantum circuits

Brian J. Smith, Dmytro Kundys, Nicholas Thomas-Peter, P. G. R. Smith, and I. A. Walmsley
Opt. Express 17(16) 13516-13525 (2009)

InGaP quantum nanophotonic integrated circuits with 1.5% nonlinearity-to-loss ratio

Mengdi Zhao and Kejie Fang
Optica 9(2) 258-263 (2022)

Electro-optic routing of photons from a single quantum dot in photonic integrated circuits

Leonardo Midolo, Sofie L. Hansen, Weili Zhang, Camille Papon, Rüdiger Schott, Arne Ludwig, Andreas D. Wieck, Peter Lodahl, and Søren Stobbe
Opt. Express 25(26) 33514-33526 (2017)