García-Álvarez L, Felicetti S, Rico E, Solano E, Sabín C
Department of Physical Chemistry, University of the Basque Country UPV/EHU, Apartado 644, E-48080, Bilbao, Spain.
Laboratoire Matériaux et Phénoménes Quantiques, Sorbonne Paris Cité, Université Paris Diderot, CNRS UMR 7162, 75013, Paris, France.
Sci Rep. 2017 Apr 6;7(1):657. doi: 10.1038/s41598-017-00770-z.
We show that simulated relativistic motion can generate entanglement between artificial atoms and protect them from spontaneous emission. We consider a pair of superconducting qubits coupled to a resonator mode, where the modulation of the coupling strength can mimic the harmonic motion of the qubits at relativistic speeds, generating acceleration radiation. We find the optimal feasible conditions for generating a stationary entangled state between the qubits when they are initially prepared in their ground state. Furthermore, we analyse the effects of motion on the probability of spontaneous emission in the standard scenarios of single-atom and two-atom superradiance, where one or two excitations are initially present. Finally, we show that relativistic motion induces sub-radiance and can generate a Zeno-like effect, preserving the excitations from radiative decay.
我们表明，模拟相对论运动可以在人造原子之间产生纠缠，并保护它们免受自发辐射的影响。我们考虑一对耦合到谐振器模式的超导量子比特，其中耦合强度的调制可以模拟量子比特以相对论速度的简谐运动，从而产生加速辐射。我们找到了当初始处于基态的量子比特之间产生稳态纠缠态的最佳可行条件。此外，我们分析了在单原子和双原子超辐射的标准情形下，运动对自发辐射概率的影响，其中初始存在一个或两个激发。最后，我们表明相对论运动会诱导亚辐射，并可以产生类似芝诺的效应，保护激发免受辐射衰变的影响。
