Entanglement of a qubit coupled to a resonator in the adiabatic regime (6 pages)

Giuseppe Di Liberti, Rosa Letizia Zaffino, Franco Piperno +1 more

We discuss the ground state entanglement of a bi-partite system, composed by a qubit strongly interacting with an oscillator mode, as a function of the coupling strength, the transition frequency and the level asymmetry of the qubit. This is done in the adiabatic regime in which the time evolution of the qubit is much faster than the oscillator one. Within the adiabatic approximation, we obtain a complete characterization of the ground state properties of the system and of its entanglement content.

Marco Lucamarini, Simone Paganelli

Ivan Deutsch, Paul M. Alsing, Barry C. Sanders +1 more

LIBERTI G, ZAFFINO R. L, Franco Piperno +1 more

We discuss the ground state entanglement of a bi-partite system, composed by a qubit strongly interacting with an oscillator mode, as a function of the coupling strength, the transition frequency and the level asymmetry of the qubit. This is done in the adiabatic regime in which the time evolution of the qubit is much faster than the oscillator one. Within the adiabatic approximation, we obtain a complete characterization of the ground state properties of the system and of its entanglement content.

Paolo Zanardi A, Alioscia Hamma

Rusko Ruskov, Charles Tahan

Understanding the coupling of superconducting (SC) wires to solid state qubits is vital to the design of quantum computers. To date, there has not been a complete theory applicable to all parameter regimes, from the traditional dispersive regime of circuit QED to the resonance regime to the far-off resonance situation in the adiabatic regime. This work presents that theory in the context of modulated longitudinal coupling, which promises to enhance the readout and coupling speed and fidelity through a resonator of solid-state qubit operations.