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Squeezed states of spin systems are an important entangled resource forquantum technologies, particularly quantum metrology and sensing. Here weconsider the generation of spin squeezed states by interacting the spins with adissipative ancillary system. We show that spin squeezing can be generated inthis model by two different mechanisms: one-axis twisting and driven collectiverelaxation. We can interpolate between the two mechanisms by simply adjustingthe detuning between the dissipative ancillary system and the spin system.Interestingly, we find that for both mechanisms, ancillary system dissipationneed not be considered an imperfection in our model, but plays a positive rolein spin squeezing. To assess the feasibility of spin squeezing we consider twodifferent implementations with superconducting circuits. We conclude that it isexperimentally feasible to generate a squeezed state of hundreds of spinseither by one-axis twisting or by driven collective relaxation.

A hybrid-systems approach to spin squeezing using a highly dissipative ancillary system