Stevens Josey, Deffner Sebastian
Department of Physics, University of Maryland, Baltimore County, Baltimore, Maryland 21250, USA.
Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland 20723, USA.
Phys Rev E. 2019 Apr;99(4-1):042129. doi: 10.1103/PhysRevE.99.042129.
Recent years have seen a flurry of research activity in the study of minimal and autonomous information ratchets. However, the existing classical and quantum models are somewhat hard to compare and hence quantifying possible quantum supremacy in information ratchets has been elusive. We propose a step towards filling this void between quantum and classical ratchets by introducing a model with continuous variables: a quantum particle in a box coupled to a stream of qubits. The dynamics is solved exactly and we analyze the quantum to classical transition in terms of a natural timescale parameter for the model.
近年来，在最小和自主信息棘轮的研究方面出现了一系列研究活动。然而，现有的经典和量子模型在某种程度上难以比较，因此量化信息棘轮中可能存在的量子优越性一直难以实现。我们通过引入一个连续变量模型：一个与量子比特流耦合的盒中量子粒子，朝着填补量子和经典棘轮之间的这一空白迈出了一步。该动力学被精确求解，并且我们根据该模型的一个自然时间尺度参数来分析量子到经典的转变。
