Optimal quantum parameter estimation of two-qutrit Heisenberg XY chain under decoherence |
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Institution: | 1. School of Physics and Electronics, Guizhou Normal University, Guiyang 550001, China;2. School of Mathematics, Guizhou Normal University, Guiyang 550001, China |
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Abstract: | 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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Keywords: | intrinsic decoherence quantum Fisher information spin chain |
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