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 antisqueezing 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.
Bibliographical noteFunding Information:
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreements No. 951737 and No. 731473. This project was supported by the Danish National Research Foundation through the Center of Excellence for Macroscopic Quantum States (bigQ, DNRF0142). R. F. acknowledges Projects No. LTAUSA19099 and No. 8C20002 from the Ministry of Education, Youth and Sports of Czech Republic. K. P. acknowledges Project No. 19-19722J of the Grant Agency of Czech Republic (GACR).