基于光量子芯片的量子自旋链中完美态转移可编程量子模拟

近些年，量子计算物理实现技术进步很快，构建能够发挥实际用途的量子计算装置成为发展重点。采用量子模拟研究量子自旋系统的演化行为，相比于经典模拟会更加高效。一维量子自旋链中完美态转移模型在量子通信和量子计算领域具有重要的研究价值。提出一种基于双光子连续时间量子漫步的可编程完美态转移量子模拟方法，并且基于光量子芯片完成了2类特殊哈密顿量作用下XY型量子自旋链中双激发“周期-镜像”完美态转移的量子模拟实验，为模拟量子自旋系统的演化提供了一种实用且可扩展的实验方案。

Programmable quantum simulation of perfect state transferin quantum spin chain with a quantum photonic chip

In recent years, the physical realization technology of quantum computing has made rapid progress, and the construction of quantum computing devices for practical use has become the development focus. Compared with classical simulation, it is more efficient for quantum simulation to study the evolution behavior of quantum spin system. The perfect state transfer in a one-dimensional quantum spin chain has important re-search value in the field of quantum communication and quantum computation. This paper proposes a pro-grammable quantum simulation method of perfect state transfer based on continuous-time quantum walks of two photons, and experimentally demonstrates “periodic and mirror-symmetric” perfect state transfer of two excitations in XY-type quantum spin chain under two special Hamiltonians with a quantum photonic chip. The results provide a practical and scalable scheme for simulating the dynamics of quantum spin systems.