Floquet Two-axis Spin-nematic Squeezing

Squeezing, which redistributes the quantum fluctuations between two noncommuting observables while preserving the minimum uncertainty product, has been extensively studied in boson systems. In addition, research in squeezed spin states (SSSs) is a topical area due to its significant applications in high-precision measurement and in quantum information science.The building block of spin squeezing is One-axis twisting (OAT). A two-axis counter-twisting mechanisms (TAT) is introduced as a natural extension of OAT and is shown to further reduce the quantum noise. So far, there are plenty of experiments that realized OAT while TAT haven't been achieved due to the experimental complexity. In this talk, I will present a way to produce TAT in spin-nematic squeezed system by Floquet driving. Periodically microwave and radio frequency pulse sequence can adjust the direction of spin squeezing and thus generates an effective TAT Hamiltonian. By adapting this method, there is no need to change the setup of the apparatus, but instead, changes only the time sequence, improving the current experimental limit of spin squeezing.