空间扩展线性三量子比特寄存器的保真度和纠缠度
Fidelity and Entanglement of a Spatially Extended Linear Three-Qubit Register
摘要：
我们研究了三量子比特阵列与基底声子耦合的退相干。假设初始的三个量子比特纠缠态对于相同的量子比特位置是无消相干的，允许我们专注于不可避免的空间量子比特分离的非马尔可夫效应。事实证明，当量子比特被规则地间隔开时，相干性受到的影响最大。此外，我们发现，直到一个常数的比例因子，两个量子比特纠缠不受第三个量子比特的存在f的影响，即使所有的量子比特通过声子场相互作用。
英文摘要：
We study decoherence of a three-qubit array coupled to substrate phonons. Assuming an initial three-qubit entangled state that would be decoherence-free for identical qubit positions, allows us to focus on non-Markovian effects of the inevitable spatial qubit separation. It turns out that the coherence is most affected when the qubits are regularly spaced. Moreover, we find that up to a constant scaling factor, two-qubit entanglement is not influenced by the presence f the third qubit, even though all qubits interact via the phonon field.
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