Affiliation:
1. Jilin University
2. University of Science and Technology of China
Abstract
Rotated optical axis waveguides can facilitate on-chip arbitrary wave-plate operations, which are crucial tools for developing integrated universal quantum computing algorithms. In this paper, we propose a unique technique based on femtosecond laser direct writing technology to fabricate arbitrarily rotated optical axis waveguides. First, a circular isotropic main waveguide with a non-optical axis was fabricated using a beam shaping method. Thereafter, a trimming line was used to create an artificial stress field near the main waveguide to induce a rotated optical axis. Using this technique, we fabricated high-performance half- and quarter-wave plates. Subsequently, high-fidelity (97.1%) Pauli-X gate operation was demonstrated via quantum process tomography, which constitutes the basis for the full manipulation of on-chip polarization-encoded qubits. In the future, this work is expected to lead to new prospects for polarization-encoded information in photonic integrated circuits.
Funder
Major Science and Technology Projects in Jilin Province
the Innovation Program for Quantum Science and Technology
National Natural Science Foundation of China
Key Technologies Research and Development Program of Anhui Province
China Postdoctoral Science Foundation
Fundamental Research Funds for the Central Universities
Subject
Atomic and Molecular Physics, and Optics