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Coherently manipulating triplet-exciton qubit by circularly polarized laser |
| Longlong Zhang(张龙龙), Hongwei Li(李宏伟), Zhenyu Xu(徐振宇), Mengze Tao(陶孟泽), Rui Chen(陈睿), and Yingqi Ma(马英起)† |
| State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract We theoretically propose a scheme for the coherent manipulation of a single qubit, which is constructed using the self-trapped triplet exciton (STTE) in FM/polymer/FM sandwich. The STTE serves as a quantum dot, comprising two degenerate triplet states with opposite magnetizations, thereby forming the qubit's subspace. We demonstrate that the spin state of this qubit can be coherently manipulated by applying an external circularly polarized laser (CPL) to form the Floquet state. The manipulation exhibits significant helicity dependence: when the CPL's angular momentum is antiparallel to the STTE's spin orientation, the STTE undergoes Rabi oscillations between the $|\uparrow\uparrow\rangle$ and $|\downarrow\downarrow\rangle$ state, corresponding to a $\pi$-rotation around the $x$-axis on the Bloch sphere. Conversely, when the CPL's angular momentum is parallel to the STTE's spin orientation, the STTE remains unresponsive to the CPL. Two-axis coherent control of the STTE qubit can be potentially realized by additionally applying a static magnetic field $B_{z}$. Our work provides a theoretical perspective for realizing the coherent manipulation of a qubit in organic devices.
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Received: 26 June 2025
Revised: 01 October 2025
Accepted manuscript online: 17 October 2026
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PACS:
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03.67.Lx
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(Quantum computation architectures and implementations)
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85.75.-d
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(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
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71.35.Lk
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(Collective effects (Bose effects, phase space filling, and excitonic phase transitions))
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFF0503603), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB1200200), and the Study Encouragement to Youth Innovation Promotion Association Outstanding Member of the Chinese Academy of Sciences (Grant No. Y2022057). |
Corresponding Authors:
Yingqi Ma
E-mail: myq@nssc.ac.cn
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Cite this article:
Longlong Zhang(张龙龙), Hongwei Li(李宏伟), Zhenyu Xu(徐振宇), Mengze Tao(陶孟泽), Rui Chen(陈睿), and Yingqi Ma(马英起) Coherently manipulating triplet-exciton qubit by circularly polarized laser 2026 Chin. Phys. B 35 070303
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[1] Divincenzo D P 2000 Fortschr. Phys. 48 771
[2] Veldhorst M, Yang C H, Hwang J C C, et al. 2015 Nature 526 410
[3] Petta J R, Johnson A C, Taylor J M, et al. 2005 Sciene 309 5744
[4] Kormanyos1 A, Zolyomi V, Drummond N D and Burkard G 2014 Phys. Rev. X 4 011034
[5] Qu F Y, Braganca H, Vasconcelos R, et al. 2019 2D Mater. 6 045014
[6] Wang G, Marie X, Liu B L, et al. 2016 Phys. Rev. Lett 117 187401
[7] Nowack K C, Shafiei M, Lafores M, et al. 2011 Science 333 6047
[8] Tusun M, Rong X and Du J 2019 Chin. Phys. B 28 024204
[9] Bermeister A, Keith D and Culcer D 2014 App. Phys. Lett. 105 192102
[10] Pei T, Palyi A, Mergenthaler M, et al. 2017 Phys. Rev. Lett. 118 177701
[11] Mccamey D R, Seipel H A, Paik S Y, et al. 2008 Nat. Mater. 7 723
[12] Palmer J R, Williams M L, Young R M, et al. 2024 J. Am. Chem. Soc. 146 1089
[13] Shuai Z, Beljonne D, Silbey R J and Bredas J L 1999 Phys. Rev. Lett. 84 131
[14] Zrenner A, Beham E, Stufler S, et al. 2002 Nature 418 612
[15] Stievater T H, Li X, Steel D G, et al. 2002 Phys. Rev. Lett. 87 133603
[16] Patton B, Woggon U and Langbein W 2005 Phys. Rev. Lett. 95 266401
[17] Zhang L, Hao Y, Qin W, et al. 2020 New J. Phys. 22 103034
[18] Su W P, Schriffer J R and Heeger A J 1979 Phys. Rev. Lett. 42 1698
[19] Heeger A J, Kivelson S and Schrieffer J R 1988 Rev. Mod. Phys. 60 781
[20] Zhang L and Hao Y 2021 App. Phys. Lett. 118 093301
[21] Zhang L, Xie S and Kang D 2017 Phys. Rev. E 96 022414
[22] Zhang L and Yamamoto S 2014 J. Phys. Soc. Jpn. 83 064708
[23] Lu Q X, Ma X L, Gao T, Xie S and Qu F 2019 Phys. Chem. Chem. Phys. 21 12924 |
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