An efficient singlet-triplet spin qubit to fiber interface assisted by a photonic crystal cavity
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911927763992576 |
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| author | Wu, Kui Kindel, Sebastian Descamps, Thomas Hangleiter, Tobias Müller, Jan Christoph Rodrigo, Rebecca Merget, Florian Bluhm, Hendrik Witzens, Jeremy |
| author_facet | Wu, Kui Kindel, Sebastian Descamps, Thomas Hangleiter, Tobias Müller, Jan Christoph Rodrigo, Rebecca Merget, Florian Bluhm, Hendrik Witzens, Jeremy |
| contents | We introduce a novel optical interface between a singlet-triplet spin qubit and a photonic qubit which would offer new prospects for future quantum communication applications. The interface is based on a 220 nm thick GaAs/Al-GaAs heterostructure membrane and features a gate-defined singlet-triplet qubit, a gate-defined optically active quantum dot, a photonic crystal cavity and a bot-tom gold reflector. All essential components can be lithographically defined and deterministically fabricated, which greatly increases the scalability of on-chip in-tegration. According to our FDTD simulations, the interface provides an overall coupling efficiency of 28.7% into a free space Gaussian beam, assuming an SiO2 interlayer filling the space between the reflector and the membrane. The performance can be further increased to 48.5% by undercutting this SiO2 interlayer below the photonic crystal. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_14392 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An efficient singlet-triplet spin qubit to fiber interface assisted by a photonic crystal cavity Wu, Kui Kindel, Sebastian Descamps, Thomas Hangleiter, Tobias Müller, Jan Christoph Rodrigo, Rebecca Merget, Florian Bluhm, Hendrik Witzens, Jeremy Optics Quantum Physics We introduce a novel optical interface between a singlet-triplet spin qubit and a photonic qubit which would offer new prospects for future quantum communication applications. The interface is based on a 220 nm thick GaAs/Al-GaAs heterostructure membrane and features a gate-defined singlet-triplet qubit, a gate-defined optically active quantum dot, a photonic crystal cavity and a bot-tom gold reflector. All essential components can be lithographically defined and deterministically fabricated, which greatly increases the scalability of on-chip in-tegration. According to our FDTD simulations, the interface provides an overall coupling efficiency of 28.7% into a free space Gaussian beam, assuming an SiO2 interlayer filling the space between the reflector and the membrane. The performance can be further increased to 48.5% by undercutting this SiO2 interlayer below the photonic crystal. |
| title | An efficient singlet-triplet spin qubit to fiber interface assisted by a photonic crystal cavity |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2406.14392 |