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Well-protected quantum state transfer in a dissipative spin chain

机译:耗散自旋链中受保护的量子态转移

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摘要

In this work, a mechanism is investigated for improving the quantum state transfer efficiency in a spin chain, which is in contact with a dissipative structured reservoir. The efficiency of the method is based on the addition of similar non-interacting auxiliary chains into the reservoir. In this way, we obtain the exact solution for the master equation of the spin chain in the presence of dissipation. It is found out that entering more auxiliary chains into the reservoir causes, in general, the better improvement of the fidelity of state transfer along the mentioned chain. Furthermore, it is reveal that the protocol has better efficiency for a chain with longer length. Therefore, by this method, quantum state transfer along a linear chain with an arbitrary number of qubits, can be well-protected against the dissipative noises.
机译:在这项工作中,研究了一种机制,用于改善与耗散结构化储层接触的自旋链中的量子态转移效率。该方法的效率是基于将类似的非相互作用辅助链添加到储层中。这样,我们在存在耗散的情况下获得了自旋链主方程的精确解。已经发现,将更多的辅助链进入储层通常会导致沿所述链的状态转移的保真度得到更好的改善。此外,揭示了该协议对于具有更长长度的链具有更好的效率。因此,通过该方法,可以很好地保护沿着具有任意数量的量子比特的线性链的量子态转移。

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