  Aging transition is an emergent behavior observed in networks consisting of
active (self-oscillatory) and inactive (non self-oscillatory) nodes, where the
network transits from a global oscillatory state to an oscillation collapsed
state when the fraction of inactive oscillators surpasses a critical value.
However, the aging transition in quantum domain has not been studied yet. In
this paper we investigate the quantum manifestation of aging transition in a
network of active-inactive quantum oscillators. We show that, unlike classical
case, the quantum aging is not characterized by a complete collapse of
oscillation but by sufficient reduction in the mean boson number. We identify a
critical ``knee" value in the fraction of inactive oscillators around which
quantum aging occurs in two different ways. Further, in stark contrast to the
classical case, quantum aging transition depends upon the nonlinear damping
parameter. We also explain the underlying processes leading to quantum aging
that have no counterpart in the classical domain.
