Discrete Time Crystal Phase as a Resource for Quantum Enhanced Sensing
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910896878518272 |
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| author | Yousefjani, Rozhin Sacha, Krzysztof Bayat, Abolfazl |
| author_facet | Yousefjani, Rozhin Sacha, Krzysztof Bayat, Abolfazl |
| contents | Discrete time crystals are a special phase of matter in which time translational symmetry is broken through a periodic driving pulse. Here, we first propose and characterize an effective mechanism to generate a stable discrete time crystal phase in a disorder-free many-body system with indefinite persistent oscillations even in finite-size systems. Then we explore the sensing capability of this system to measure the spin exchange coupling. The results show strong quantum-enhanced sensitivity throughout the time crystal phase. As the spin exchange coupling varies, the system goes through a sharp phase transition and enters a non-time crystal phase in which the performance of the probe considerably decreases. We characterize this phase transition as a second-order type and determine its critical properties through a comprehensive finite-size scaling analysis. The performance is independent of the initial states and may even benefit from imperfections in the driving pulse. A simple set of projective measurements can capture the quantum-enhanced sensitivity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_00328 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Discrete Time Crystal Phase as a Resource for Quantum Enhanced Sensing Yousefjani, Rozhin Sacha, Krzysztof Bayat, Abolfazl Quantum Physics Strongly Correlated Electrons Discrete time crystals are a special phase of matter in which time translational symmetry is broken through a periodic driving pulse. Here, we first propose and characterize an effective mechanism to generate a stable discrete time crystal phase in a disorder-free many-body system with indefinite persistent oscillations even in finite-size systems. Then we explore the sensing capability of this system to measure the spin exchange coupling. The results show strong quantum-enhanced sensitivity throughout the time crystal phase. As the spin exchange coupling varies, the system goes through a sharp phase transition and enters a non-time crystal phase in which the performance of the probe considerably decreases. We characterize this phase transition as a second-order type and determine its critical properties through a comprehensive finite-size scaling analysis. The performance is independent of the initial states and may even benefit from imperfections in the driving pulse. A simple set of projective measurements can capture the quantum-enhanced sensitivity. |
| title | Discrete Time Crystal Phase as a Resource for Quantum Enhanced Sensing |
| topic | Quantum Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2405.00328 |