论文标题
相互作用的量子转移
Quantum transfer of interacting qubits
论文作者
论文摘要
在不同位置之间的量子信息传输是许多量子信息处理任务的关键。尽管已经对单个量子状态的传递进行了广泛的研究,但多体系统配置的转移仍然难以捉摸。我们解决了转移n个相互作用量子位的状态的问题。指数增长的希尔伯特空间维度和相互作用的存在都显着扩大了实现高保真转移的复杂性。通过采用随机矩阵理论的工具并使用量子动态图的形式主义,我们得出了n相互作用量子器的任意量子传输协议的平均表达式和差异的一般表达。最后,通过在自旋链中采用弱耦合方案,我们获得了3和4相互作用量子的高保真转移的明确条件。
The transfer of quantum information between different locations is key to many quantum information processing tasks. Whereas, the transfer of a single qubit state has been extensively investigated, the transfer of a many-body system configuration has insofar remained elusive. We address the problem of transferring the state of n interacting qubits. Both the exponentially increasing Hilbert space dimension, and the presence of interactions significantly scale-up the complexity of achieving high-fidelity transfer. By employing tools from random matrix theory and using the formalism of quantum dynamical maps, we derive a general expression for the average and the variance of the fidelity of an arbitrary quantum state transfer protocol for n interacting qubits. Finally, by adopting a weak-coupling scheme in a spin chain, we obtain the explicit conditions for high-fidelity transfer of 3 and 4 interacting qubits.