Regular Article

Heisenberg operator approach for spin squeezing dynamics

¹ School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
² Fachbereich Physik und Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

^a e-mail: aranyabhuti@gmail.com

Received: 18 August 2017
Published online: 19 December 2017

Abstract

We reconsider the one-axis twisting Hamiltonian, which is commonly used for generating spin squeezing, and treat its dynamics within the Heisenberg operator approach. To this end we solve the underlying Heisenberg equations of motion perturbatively and evaluate the expectation values of the resulting time-dependent Heisenberg operators in order to determine approximately the dynamics of spin squeezing. Comparing our results with those originating from exact numerics reveals that they are more accurate than the commonly used frozen spin approximation.