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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.19976 |
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| _version_ | 1866908793108955136 |
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| author | Zheng, Tian-Xing Utama, M. Iqbal Bakti Gao, Xingyu Kar, Moumita Yu, Xiaofei Kang, Sungsu Cai, Hanyan Ruan, Tengyang Ovetsky, David Zvi, Uri Lao, Guanming Wang, Yu-Xin Raz, Omri Chitransh, Sanskriti Smith, Grant T. Weiss, Leah R. Czyz, Magdalena H. Yang, Shengsong Fairhall, Alex J. Watanabe, Kenji Taniguchi, Takashi Awschalom, David D. Alivisatos, A. Paul Goldsmith, Randall H. Schatz, George C. Hersam, Mark C. Maurer, Peter C. |
| author_facet | Zheng, Tian-Xing Utama, M. Iqbal Bakti Gao, Xingyu Kar, Moumita Yu, Xiaofei Kang, Sungsu Cai, Hanyan Ruan, Tengyang Ovetsky, David Zvi, Uri Lao, Guanming Wang, Yu-Xin Raz, Omri Chitransh, Sanskriti Smith, Grant T. Weiss, Leah R. Czyz, Magdalena H. Yang, Shengsong Fairhall, Alex J. Watanabe, Kenji Taniguchi, Takashi Awschalom, David D. Alivisatos, A. Paul Goldsmith, Randall H. Schatz, George C. Hersam, Mark C. Maurer, Peter C. |
| contents | Fluorescent spin qubits are central building blocks of quantum technologies. Placing these qubits at surfaces maximizes coupling to nearby spins and fields, enabling nanoscale sensing and facilitating integration with photonic and superconducting devices. However, reducing the dimensions or size of established qubit systems without sacrificing the qubit performance or degrading the coherence lifetime remains challenging. Here, we introduce a surface molecular qubit formed by pentacene molecules scaffolded on a two-dimensional (2D) material, hexagonal boron nitride (hBN). The qubit exhibits stable fluorescence and optically detected magnetic resonance (ODMR) from cryogenic to ambient conditions. With fully deuterated pentacene, the Hahn-echo coherence reaches 22 $μ$s and further extends to 214 $μ$s under dynamical decoupling, outperforming state-of-the-art shallow NV centers in diamond, despite being positioned directly on the surface. We map the local spin environment, resolving couplings to nearby nuclear and electron spins that can serve as auxiliary quantum resources. This platform combines true surface integration, long qubit coherence, and scalable fabrication, opening routes to quantum sensing, quantum simulation, and hybrid quantum devices. It also paves the way for a broader family of 2D material-supported molecular qubits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_19976 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Surface-Scaffolded Molecular Qubit Zheng, Tian-Xing Utama, M. Iqbal Bakti Gao, Xingyu Kar, Moumita Yu, Xiaofei Kang, Sungsu Cai, Hanyan Ruan, Tengyang Ovetsky, David Zvi, Uri Lao, Guanming Wang, Yu-Xin Raz, Omri Chitransh, Sanskriti Smith, Grant T. Weiss, Leah R. Czyz, Magdalena H. Yang, Shengsong Fairhall, Alex J. Watanabe, Kenji Taniguchi, Takashi Awschalom, David D. Alivisatos, A. Paul Goldsmith, Randall H. Schatz, George C. Hersam, Mark C. Maurer, Peter C. Quantum Physics Mesoscale and Nanoscale Physics Materials Science Fluorescent spin qubits are central building blocks of quantum technologies. Placing these qubits at surfaces maximizes coupling to nearby spins and fields, enabling nanoscale sensing and facilitating integration with photonic and superconducting devices. However, reducing the dimensions or size of established qubit systems without sacrificing the qubit performance or degrading the coherence lifetime remains challenging. Here, we introduce a surface molecular qubit formed by pentacene molecules scaffolded on a two-dimensional (2D) material, hexagonal boron nitride (hBN). The qubit exhibits stable fluorescence and optically detected magnetic resonance (ODMR) from cryogenic to ambient conditions. With fully deuterated pentacene, the Hahn-echo coherence reaches 22 $μ$s and further extends to 214 $μ$s under dynamical decoupling, outperforming state-of-the-art shallow NV centers in diamond, despite being positioned directly on the surface. We map the local spin environment, resolving couplings to nearby nuclear and electron spins that can serve as auxiliary quantum resources. This platform combines true surface integration, long qubit coherence, and scalable fabrication, opening routes to quantum sensing, quantum simulation, and hybrid quantum devices. It also paves the way for a broader family of 2D material-supported molecular qubits. |
| title | A Surface-Scaffolded Molecular Qubit |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2601.19976 |