Dissipative dynamics in a tunable Rabi dimer with periodic harmonic driving

Area of Science:

• Quantum Computing
• Circuit Quantum Electrodynamics (cQED)
• Quantum Dynamics

Background:

• Periodic driving signals are increasingly used for qubit manipulation.
• Rabi dimers are fundamental systems for studying qubit-photon interactions.
• Environmental noise, like phonon baths, significantly impacts quantum system dynamics.

Purpose of the Study:

• To investigate the effects of a harmonic driving field on a Rabi dimer coupled to a phonon bath.
• To engineer photon and qubit dynamics in a circuit quantum electrodynamics (cQED) device.
• To explore nonperturbative methods for analyzing quantum system behavior.

Main Methods:

• Utilized a harmonic driving field applied to a Rabi dimer.
• Modeled environmental effects using a phonon bath with a sub-Ohmic spectral density.
• Employed the Dirac-Frenkel time-dependent variational principle and the multiple Davydov D2 ansatz for nonperturbative treatment.

Main Results:

• The driving field suppressed amplitude damping and induced photon creation in the absence of a phonon bath.
• Photon numbers and inter-qubit asymmetry could be controlled by varying the driving signal, even with the phonon bath present.
• Qubit states demonstrated direct manipulability via the harmonic driving field.

Conclusions:

• Harmonic driving offers a method to engineer photon and qubit dynamics in cQED systems.
• Environmental coupling can enhance the control over qubit states achieved through external driving.
• This research opens new possibilities for manipulating qubit states in noisy quantum devices.