Exchange-Coupled Spins for Robust High-Temperature Qubits
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916653492600832 |
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| author | Chakraborty, Aniruddha Chowdhury, Md. Fahim F. Niknam, Mohamad Bouchard, Louis S. Atulasimha, Jayasimha |
| author_facet | Chakraborty, Aniruddha Chowdhury, Md. Fahim F. Niknam, Mohamad Bouchard, Louis S. Atulasimha, Jayasimha |
| contents | We show that Heisenberg exchange interactions between the neighboring spins comprising an ensemble spin qubit (E-qubit) can act as an intrinsic error mitigator, increasing gate fidelity even at high temperatures. As an example, the fidelity of a π gate applied to E-qubits above 1 K was studied by tuning the ferromagnetic exchange strength to show an exchange coupled E-qubit exhibits higher fidelity than a single-spin based qubit. We also investigate the coherence properties of E-qubits and find that the coherence time of an E-qubit extends linearly with the number of spins in the ensemble. This suggests that exchange interactions effectively suppress decoherence induced by thermal noise, achieving a coherence time greater than 1 ms at 1 K with an ensemble of only seven spins. Additionally, the ferromagnetic isotropic exchange prevents fidelity loss induced by spatial field gradients/inhomogeneity in Zeeman and/or control fields. Therefore, exchange-coupled spin qubits could enable fault-tolerant quantum operations and long-coherence times at elevated temperatures (>1 K). |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_12071 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exchange-Coupled Spins for Robust High-Temperature Qubits Chakraborty, Aniruddha Chowdhury, Md. Fahim F. Niknam, Mohamad Bouchard, Louis S. Atulasimha, Jayasimha Mesoscale and Nanoscale Physics Quantum Physics We show that Heisenberg exchange interactions between the neighboring spins comprising an ensemble spin qubit (E-qubit) can act as an intrinsic error mitigator, increasing gate fidelity even at high temperatures. As an example, the fidelity of a π gate applied to E-qubits above 1 K was studied by tuning the ferromagnetic exchange strength to show an exchange coupled E-qubit exhibits higher fidelity than a single-spin based qubit. We also investigate the coherence properties of E-qubits and find that the coherence time of an E-qubit extends linearly with the number of spins in the ensemble. This suggests that exchange interactions effectively suppress decoherence induced by thermal noise, achieving a coherence time greater than 1 ms at 1 K with an ensemble of only seven spins. Additionally, the ferromagnetic isotropic exchange prevents fidelity loss induced by spatial field gradients/inhomogeneity in Zeeman and/or control fields. Therefore, exchange-coupled spin qubits could enable fault-tolerant quantum operations and long-coherence times at elevated temperatures (>1 K). |
| title | Exchange-Coupled Spins for Robust High-Temperature Qubits |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2503.12071 |