Enhancement of squeezing in the Rabi model with parametric nonlinearity
- URL: http://arxiv.org/abs/2008.01357v1
- Date: Tue, 4 Aug 2020 06:26:43 GMT
- Title: Enhancement of squeezing in the Rabi model with parametric nonlinearity
- Authors: V. Yogesh, Prosenjit Maity
- Abstract summary: The squeezing effect arises in the interacting qubit-oscillator system.
Based on the generalized rotating wave approximation, the approximate energy spectrum is compared with the numerically determined spectrum of the Hamiltonian.
It is shown that the squeezing produced in the Rabi model can be enhanced substantially in the presence of a parametric nonlinear term.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The squeezing effect arises in the interacting qubit-oscillator system is
studied with the presence of a parametric oscillator in the Rabi model. Based
on the generalized rotating wave approximation which works well in the wide
range of coupling strength as well as detuning, the analytically derived
approximate energy spectrum is compared with the numerically determined
spectrum of the Hamiltonian. For the initial state of the bipartite system, the
dynamical evolution of the reduced density matrix corresponding to the
oscillator is obtained by partial tracing over the qubit degree of freedom. The
oscillator's reduced density matrix yields the nonnegative phase space quasi
probability distribution known as Husimi $Q$-function which is utilized to
compute the quadrature variance. It is shown that the squeezing produced in the
Rabi model can be enhanced substantially in the presence of a parametric
nonlinear term.
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