Squeezing giant spin states via geometric phase control in cavity-assisted Raman transitions

Abstract

Squeezing ensemble of spins provides a way to surpass the standard quantum limit (SQL) in quantum metrology and test the fundamental physics as well, and therefore attracts broad interest. Here we propose an experimentally accessible protocol to squeeze a giant ensemble of spins via the geometric phase control. Using the cavity-assisted Raman transitions in a double $\Lambda$-type system, we realize an effective Dicke model. Under the condition of vanishing effective spin transition frequency, we find a particular evolution time where the cavity decouples from the spins and the spin ensemble is squeezed considerably. Our scheme has the potential to improve the sensitivity in quantum metrology with spins by about two orders.

6 pages, 3 figures

References in corpus (7)

• Phonon-induced spin-spin interactions in diamond nanostructures: application to spin squeezing
• All-optical initialization, readout, and coherent preparation of single silicon-vacancy spins in diamond
• Electron-phonon processes of the silicon-vacancy centre in diamond
• Dissipative Preparation of Spin Squeezed Atomic Ensembles in a Steady State
• All-optical formation of coherent dark states of silicon-vacancy spins in diamond
• Spin squeezing of atomic ensembles via nuclear-electronic spin entanglement
• Generating spin squeezing states and Greenberger-Horne-Zeilinger entanglement using a hybrid phonon-spin ensemble in diamond