Analytic Formulas for Quantum Discord of Special Families of N-Qubit States
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| Format: | Preprint |
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2025
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| _version_ | 1866917962894540800 |
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| author | Zhou, Jianming Hu, Xiaoli Zhang, Honglian Jing, Naihuan |
| author_facet | Zhou, Jianming Hu, Xiaoli Zhang, Honglian Jing, Naihuan |
| contents | Quantum discord, a key indicator of non-classical correlations in bipartite systems, has been recently extended to multipartite scenarios [Phys. Rev. Lett. 2020, 124:110401]. We present exact analytic formulas for the quantum discord of special families of N-qubit states, including generalized class of GHZ states. Our formulations span $2$, $3$, $4n$, $4n+1$, $4n+2$, and $4n+3$-qubit configurations where $n\in 1, 2, \ldots$, which refine the assessment of quantum correlations and provide an analytical tool in quantum computation. Moreover, we uncover a ``discord freezing'' in even-qubit systems under phase flip decoherence which provides a means for preserving quantum coherence in environmental perturbations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_21010 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Analytic Formulas for Quantum Discord of Special Families of N-Qubit States Zhou, Jianming Hu, Xiaoli Zhang, Honglian Jing, Naihuan Quantum Physics Quantum discord, a key indicator of non-classical correlations in bipartite systems, has been recently extended to multipartite scenarios [Phys. Rev. Lett. 2020, 124:110401]. We present exact analytic formulas for the quantum discord of special families of N-qubit states, including generalized class of GHZ states. Our formulations span $2$, $3$, $4n$, $4n+1$, $4n+2$, and $4n+3$-qubit configurations where $n\in 1, 2, \ldots$, which refine the assessment of quantum correlations and provide an analytical tool in quantum computation. Moreover, we uncover a ``discord freezing'' in even-qubit systems under phase flip decoherence which provides a means for preserving quantum coherence in environmental perturbations. |
| title | Analytic Formulas for Quantum Discord of Special Families of N-Qubit States |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2502.21010 |