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Realizing useful quantum operations with high fidelity is a two-task quantumcontrol problem wherein decoherence is to be suppressed and desired unitaryevolution is to be executed. The dynamical decoupling (DD) approach todecoherence suppression has been fruitful but synthesizing DD fields withcertain quantum control fields may be experimentally demanding. In the contextof spin squeezing, here we explore an unforeseen possibility that continuous DDfields may serve dual purposes at once. In particular, it is shown that arather simple configuration of DD fields can suppress collective decoherenceand yield a 1/N scaling of the squeezing performance (N is the number ofspins), thus making spin squeezing more robust to noise and much closer to theso-called Heisenberg limit. The theoretical predictions should be within thereach of current spin squeezing experiments.

Protecting and Enhancing Spin Squeezing via Continuous Dynamical Decoupling