Dissipative dynamics of a fermionic superfluid with two-body losses

We study the dissipative dynamics of a fermionic superfluid in the presence of two-body losses. We use a variational approach for the Lindblad dynamics and obtain dynamical equations for Anderson's pseudospins where dissipation enters as a complex pairing interaction as well as effective, density-dependent, single-particle losses which break the conservation of the pseudospin norm. We show that this latter has key consequences on the dynamical behavior of the system. In the case of a sudden switching of two-body losses, we show that the superfluid order parameter decays much more quickly than the particle density at short times and eventually slows down, setting into a power-law decay at longer timescales driven by the depletion of the system. We then consider a quench of pairing interaction, leading to coherent oscillations in the unitary case, followed by the switching of the dissipation. We show that losses affect the dynamical BCS synchronization by introducing not only damping but also a renormalization of the frequency of coherent oscillations, which depends nonlinearly on the rate of the two-body losses.