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Quantum information processing through quantum dots in slow-light photonic crystal waveguides

Chee Wei Wong, Jie Gao, James F. McMillan +2 more

Photonics and Nanostructures - Fundamentals and ApplicationsDec 7, 200816 citations

Single-photon switching in photonic crystal waveguide with quantum impurity via a control light

Ronggang Liu, Bingzheng Gai, Tong Liu

Optics CommunicationsSep 16, 20150 citations

Implementation scheme for quantum controlled phase-flip gate through quantum dot in slow-light photonic crystal waveguide

Jie Gao, F. W. Sun, Chee Wei Wong

We propose a scheme to realize controlled phase gate between two single photons through a single quantum dot in a slow-light photonic crystal waveguide. Enhanced Purcell factor and large β-factor lead to high gate fidelity over broadband frequencies compared to cavity-assisted system. The excellent physical integration of this photonic crystal waveguide system provides tremendous potential for large-scale quantum information processing.

arXiv:0803.1017Applied Physics LettersOct 13, 200824 citations

Observation of Electrically Tunable Chirality Inversion in a Slow-Light Waveguide

Xuchao Chen, Savvas Germanis, Nicholas J. Martin +8 more

We identify chiral inversion points in slow-light, glide-plane-symmetric, photonic-crystal waveguides, defined as fixed locations where the local optical chirality changes sign over a narrow wavelength range. We experimentally access this behaviour using a waveguide-embedded InAs/InGaAs quantum dot. The slow-light spectral region is determined from time-integrated and time-resolved photoluminescence, and the dot exciton is electrically tuned across the slow-light bandwidth via the quantum-confined Stark effect. As the emission wavelength is swept through the slow-light region, the directional emission contrast shows a strong wavelength dependence and a sign reversal, consistent with the identified chiral inversion point. Numerical simulations attribute the switching primarily to the pronounced spectral variation of the local optical chirality for emitters displaced from the waveguide center. These results demonstrate on-demand electrical switching of chiral light-matter coupling in nanophotonic waveguides and enable tunable chiral interfaces for integrated quantum photonic devices.We identify chiral inversion points in slow-light, glide-plane-symmetric, photonic-crystal waveguides, defined as fixed locations where the local optical chirality changes sign over a narrow wavelength range. We experimentally access this behaviour using a waveguide-embedded InAs/InGaAs quantum dot. The slow-light spectral region is determined from time-integrated and time-resolved photoluminescence, and the dot exciton is electrically tuned across the slow-light bandwidth via the quantum-confined Stark effect. As the emission wavelength is swept through the slow-light region, the directional emission contrast shows a strong wavelength dependence and a sign reversal, consistent with the identified chiral inversion point. Numerical simulations attribute the switching primarily to the pronounced spectral variation of the local optical chirality for emitters displaced from the waveguide center. These results demonstrate on-demand electrical switching of chiral light-matter coupling in nanophotonic waveguides and enable tunable chiral interfaces for integrated quantum photonic devices.

physics.opticsCross-listedarXiv:2605.30047May 29, 2026

Realizing quantum controlled phase-flip gate through quantum dot in silicon photonic crystal waveguide

Jie Gao, Fang‐Wen Sun, Xiaodong Yang +1 more

Scheme to realize controlled phase gate through single quantum dot in slow-light silicon photonic crystal waveguide is proposed. Enhanced Purcell factor and beta-factor lead to high gate fidelity over broadband frequencies compared to cavity-assisted system.

Conference on Lasers and Electro-OpticsMay 4, 20080 citations

All-optical Switching and Slow Light in Photonic Crystals

Andrey E. Miroshnichenko, Sergei F. Mingaleev, Kurt Busch +1 more

Jan 1, 20060 citations

Implement Scheme for Phase Switching Through Quantum Dots in Slow-Light Photonic Crystal Waveguides

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