Optimal quantum parameter estimation of two-qutrit Heisenberg XY chain under decoherence
Adopting the Milburn decoherence model, we investigate the performance of quantum Fisher information of the twoqutrit isotropic Heisenberg XY chain under decoherence. We find that the quantum Fisher information with respect to the decoherence rate and the magnetic field decreases exponentially in th...
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| Published in | 中国物理B：英文版 no. 1; pp. 149 - 154 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
2017
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| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 |
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| Summary: | Adopting the Milburn decoherence model, we investigate the performance of quantum Fisher information of the twoqutrit isotropic Heisenberg XY chain under decoherence. We find that the quantum Fisher information with respect to the decoherence rate and the magnetic field decreases exponentially in the long-time limit, which significantly reduces the precision of optimal quantum estimation. We also show that with the increase of the decoherence rate or the magnetic field,the QFIs go down considerably. Furthermore, we find that the precision of optimal quantum estimation can be enhanced by the entanglement in the input state. |
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| Bibliography: | 11-5639/O4 Hong-ying Yang;Qiang Zheng;Qi-jun Zhi;School of Physics and Electronics,Guizhou Normal University;School of Mathematics,Guizhou Normal University |
| ISSN: | 1674-1056 2058-3834 |