Room-temperature quantum entanglement in a van der Waals material
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866914060894732288 |
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| author | Gao, Xingyu Ge, Zhun Dikshit, Saakshi Vaidya, Sumukh Ju, Peng Li, Tongcang |
| author_facet | Gao, Xingyu Ge, Zhun Dikshit, Saakshi Vaidya, Sumukh Ju, Peng Li, Tongcang |
| contents | Entanglement is central to quantum science and technology. Atomic defects in two-dimensional (2D) van der Waals (vdW) materials offer exciting prospects for quantum sensing, with spatial resolution reaching 1 nm demonstrated using scanning probe techniques. However, entangling qubits in vdW materials remains elusive. Here we report room-temperature quantum entanglement between an optically addressable electron spin and a strongly coupled $^{13}$C nuclear spin in hexagonal boron nitride (hBN). We extend the electron spin coherence to 38 $μ$s with dynamical decoupling, and create maximally entangled Bell states with a fidelity up to 0.89. We further use the nuclear spin as a long-lived quantum memory to enhance AC magnetic field sensing via correlation spectroscopy. These results establish entangled spin qubits in hBN as a robust platform for advanced quantum technologies based on 2D materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_23170 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Room-temperature quantum entanglement in a van der Waals material Gao, Xingyu Ge, Zhun Dikshit, Saakshi Vaidya, Sumukh Ju, Peng Li, Tongcang Quantum Physics Mesoscale and Nanoscale Physics Entanglement is central to quantum science and technology. Atomic defects in two-dimensional (2D) van der Waals (vdW) materials offer exciting prospects for quantum sensing, with spatial resolution reaching 1 nm demonstrated using scanning probe techniques. However, entangling qubits in vdW materials remains elusive. Here we report room-temperature quantum entanglement between an optically addressable electron spin and a strongly coupled $^{13}$C nuclear spin in hexagonal boron nitride (hBN). We extend the electron spin coherence to 38 $μ$s with dynamical decoupling, and create maximally entangled Bell states with a fidelity up to 0.89. We further use the nuclear spin as a long-lived quantum memory to enhance AC magnetic field sensing via correlation spectroscopy. These results establish entangled spin qubits in hBN as a robust platform for advanced quantum technologies based on 2D materials. |
| title | Room-temperature quantum entanglement in a van der Waals material |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.23170 |