  Squeezed states of harmonic oscillators are a central resource for
continuous-variable quantum sensing, computation and communication. Here we
propose a method for the generation of very good approximations to highly
squeezed vacuum states with low excess anti-squeezing using only a few
oscillator-qubit coupling gates through a Rabi-type interaction Hamiltonian.
This interaction can be implemented with several different methods, which has
previously been demonstrated in superconducting circuit and trapped-ion
platforms. The protocol is compatible with other protocols manipulating quantum
harmonic oscillators, thus facilitating scalable continuous-variable
fault-tolerant quantum computation.
