Tapering of fs Laser-written Waveguides

Abstract

The vast development of integrated quantum photonic technology enables the implementation of compact and stable interferometric networks. In particular laser-written waveguide structures allow for complex 3D-circuits and polarization-encoded qubit manipulation. However, the main limitation for the scale-up of integrated quantum devices is the single-photon loss due to mode-profile mismatch when coupling to standard fibers or other optical platforms. Here we demonstrate tapered waveguide structures, realized by an adapted femtosecond laser writing technique. We show that coupling to standard single-mode fibers can be enhanced up to 77% while keeping the fabrication effort negligible. This improvement provides an important step for processing multi-photon states on chip.

References in corpus (7)

• Photonic quantum technologies
• Silica-on-Silicon Waveguide Quantum Circuits
• Shor's quantum factoring algorithm on a photonic chip
• Manipulating multi-photon entanglement in waveguide quantum circuits
• Implementation of Quantum and Classical Discrete Fractional Fourier Transforms
• Sub-thermal to super-thermal light statistics from a disordered lattice via deterministic control of excitation symmetry
• Hybrid waveguide-bulk multi-path interferometer with switchable amplitude and phase

Cited by in corpus (6)

• Integrated-optics heralded controlled-NOT gate for polarization-encoded qubits
• On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections
• Two-qubit quantum photonic processor manufactured by femtosecond laser writing
• Symmetry allows for distinguishability in totally destructive many-particle interference
• Continuous supersymmetric transformations in optical waveguides
• Hybrid waveguide-bulk multi-path interferometer with switchable amplitude and phase