Molitor Otavio A D, Malavazi André H A, Baldijão Roberto Dobal, Orthey Alexandre C, Paiva Ismael L, Dieguez Pedro R
International Centre for Theory of Quantum Technologies, University of Gdańsk, Jana Bażyńskiego 1A, 80-309 Gdańsk, Poland.
Center for Theoretical Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland.
Commun Phys. 2024;7(1):373. doi: 10.1038/s42005-024-01843-y. Epub 2024 Nov 19.
The superposition of causal orders shows promise in various quantum technologies. However, the fragility of quantum systems arising from environmental interactions, leading to dissipative behavior and irreversibility, demands a deeper understanding of the possible instabilities in the coherent control of causal orders. In this work, we employ a collisional model to investigate the impact of an open control system on the generation of interference between two causal orders. We present the environmental instabilities for the switch of two arbitrary quantum operations and examine the influence of environmental temperature on each potential outcome of control post-selection. Additionally, we explore how environmental instabilities affect protocol performance, including switching between mutually unbiased measurement observables and refrigeration powered by causal order superposition, providing insights into broader implications.
因果序的叠加在各种量子技术中展现出了前景。然而，环境相互作用导致量子系统的脆弱性，进而引发耗散行为和不可逆性，这就需要更深入地理解因果序相干控制中可能存在的不稳定性。在这项工作中，我们采用碰撞模型来研究开放控制系统对两个因果序之间干涉产生的影响。我们给出了两个任意量子操作切换时的环境不稳定性，并研究了环境温度对控制后选择的每个潜在结果的影响。此外，我们还探讨了环境不稳定性如何影响协议性能，包括在相互无偏测量可观测量之间的切换以及由因果序叠加驱动的制冷，从而提供更广泛的见解。
