Transition from order to chaos in reduced quantum dynamics

We study a damped kicked top dynamics of a large number of qubits (N oc,) and focus on an evolution of a reduced single-qubit subsystem. Each subsystem is subjected to the amplitude damping channel controlled by the damping constant r e [0, 1], which plays the role of the single control parameter. In the parameter range for which the classical dynamics is chaotic, while varying r we find the universal period-doubling behavior characteristic to one-dimensional maps: period-2 dynamics starts at r1 ti 0.3181, while the next bifurcation occurs at r2 ti 0.5387. In parallel with period-4 oscillations observed for r r3 ti 0.5672, we identify a secondary bifurcation diagram around r ti 0.544, responsible for a small-scale chaotic dynamics inside the attractor. The doubling of the principal bifurcation tree continues until r roc, similar to 0.578, which marks the onset of the full scale chaos interrupted by the windows of the oscillatory dynamics corresponding to the Sharkovsky order. Finally, for r = 1 the model reduces to the standard undamped chaotic kicked top.