Quantum entanglement maintained by virtual excitations in an ultrastrongly-coupled-oscillator system
Quantum entanglement maintained by virtual excitations in an ultrastrongly-coupled-oscillator system
We study the effect of quantum entanglement maintained by virtual excitations in an ultrastrongly-coupled harmonic-oscillator system. Here, the quantum entanglement is caused by the counterrotating interaction terms and hence it is maintained by the virtual excitations. We obtain the analytical expression for the ground state of the system and analyze …