Iorsh Ivan, Poshakinskiy Alexander, Poddubny Alexander
Department of Physics and Technology, ITMO University, St. Petersburg 197101, Russia.
Ioffe Institute, St. Petersburg 194021, Russia.
Phys Rev Lett. 2020 Oct 30;125(18):183601. doi: 10.1103/PhysRevLett.125.183601.
We develop a rigorous theoretical framework for interaction-induced phenomena in the waveguide quantum electrodynamics (QED) driven by mechanical oscillations of the qubits. Specifically, we predict that the simplest setup of two qubits, harmonically trapped over an optical waveguide, enables the ultrastrong coupling regime of the quantum optomechanical interaction. Moreover, the combination of the inherent open nature of the system and the strong optomechanical coupling leads to emerging parity-time (PT) symmetry, quite unexpected for a purely quantum system without artificially engineered gain and loss. The PT phase transition drives long-living subradiant states, observable in the state-of-the-art waveguide QED setups.
我们为受量子比特机械振荡驱动的波导量子电动力学（QED）中的相互作用诱导现象建立了一个严格的理论框架。具体而言，我们预测，两个量子比特在光波导上进行简谐捕获的最简单设置，能够实现量子光机械相互作用的超强耦合 regime。此外，系统固有的开放性质与强光机械耦合相结合，导致出现宇称 - 时间（PT）对称性，这对于一个没有人工设计增益和损耗的纯量子系统来说是相当出乎意料的。PT 相变驱动长寿命的亚辐射态，这在当前最先进的波导 QED 设置中是可观测的。
