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11 June 2024 Ultracompact and tunable Bell state source using transition metal dichalcogenides
Maximilian A. Weissflog, Anna Fedotova, Yilin Tang, Elkin A. Santos, Benjamin Laudert, Saniya Shinde, Fatemeh Abtahi, Mina Afsharnia, Inmaculada Pérez Pérez, Sebastian Ritter, Hao Qin, Jiri Janousek, Sai Shradha, Isabelle Staude, Sina Saravi, Thomas Pertsch, Frank Setzpfandt, Yuerui Lu, Falk Eilenberger
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Proceedings Volume PC12993, Quantum Technologies 2024; PC1299308 (2024) https://doi.org/10.1117/12.3022177
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
Entangled photon-pairs are crucial for applications like quantum key distribution, sensing and imaging. For prospective use in real world devices, the challenge for Entangled Photon-Pair Sources (EPS) is to simultaneously meet high requirements regarding state fidelity, tunability etc. while maintaining a small footprint and high robustness. In this work, we develop an EPS that meets these demands. Using a sub-micron thick Transition Metal Dichalcogenide (TMD) crystal, we show tunable generation of polarization entangled Bell states via Spontaneous Parametric Down-Conversion (SPDC). To the best of our knowledge, this is the first realization of SPDC in a TMD. In particular, we employ the TMD 3R-phase molybdenum disulfide (3R-MoS2), which due to its crystal symmetry intrinsically creates entanglement without needing external optical components. We experimentally demonstrate tuning between different maximally entangled states with constant generation efficiency and show pathways towards highly efficient and tunable TMD-based EPS using quasi-phasematching or cavity integration.
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Maximilian A. Weissflog, Anna Fedotova, Yilin Tang, Elkin A. Santos, Benjamin Laudert, Saniya Shinde, Fatemeh Abtahi, Mina Afsharnia, Inmaculada Pérez Pérez, Sebastian Ritter, Hao Qin, Jiri Janousek, Sai Shradha, Isabelle Staude, Sina Saravi, Thomas Pertsch, Frank Setzpfandt, Yuerui Lu, and Falk Eilenberger "Ultracompact and tunable Bell state source using transition metal dichalcogenides", Proc. SPIE PC12993, Quantum Technologies 2024, PC1299308 (11 June 2024); https://doi.org/10.1117/12.3022177
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KEYWORDS
Transition metals
Crystals
Entangled states
Quantum entanglement
Design
Optical components
Polarization
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