Topological Quantum State Control through Exceptional-Point Proximity
Topological Quantum State Control through Exceptional-Point Proximity
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DOI：
10.1103/physrevlett.128.160401
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发表时间：
2022-04-18
影响因子：
8.6
通讯作者：
Murch, Kater W.
中科院分区：
文献类型：
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作者：
Abbasi, Maryam;Chen, Weijian;Murch, Kater W.
我们研究了实现为耗散超导跨声子电路的子流形的非厄米特量子比特的量子演化。实时调整系统参数以包围一个例外点会导致非互易量子态转移。我们进一步观察态输运下积累的手征几何相位，验证了复杂能量格局中演化的量子相干性质，并区分了与例外点包围相关的相干和非相干效应。我们的工作展示了一种控制量子态矢量的全新方法，突出了通过动态非厄米控制实现的量子浴工程的新方面。
We study the quantum evolution of a non-Hermitian qubit realized as a submanifold of a dissipative superconducting transmon circuit. Real-time tuning of the system parameters to encircle an exceptional point results in nonreciprocal quantum state transfer. We further observe chiral geometric phases accumulated under state transport, verifying the quantum coherent nature of the evolution in the complex energy landscape and distinguishing between coherent and incoherent effects associated with exceptional point encircling. Our work demonstrates an entirely new method for control over quantum state vectors, highlighting new facets of quantum bath engineering enabled through dynamical non-Hermitian control.