Efficient steady state entanglement generation in strongly driven coupled qubits

Abstract

We report on a mechanism to optimize the generation of steady-state entanglement in a system of coupled qubits driven by microwave fields. Due to the interplay between Landau-Zener-Stückerlberg pumping involving three levels and a subsequent fast relaxation channel, which is activated by tuning the qubits-reservoir couplings, a maximally entangled state can be populated. This mechanism does not require from the fine-tuning of multiphoton-resonances but depends on the sign of the qubit-qubit coupling. In particular, we find that by a proper design of the system parameters and the driving protocol, the two-qubits steady-state concurrence can attain values close to 1 in a wide range of driving amplitudes. Our results may be useful to gain further insight into entanglement control and manipulation in dissipative quantum systems exposed to strong driving.

12 pages, 12 figures

References in corpus (19)

• An Open-System Quantum Simulator with Trapped Ions
• Quantum harmonic oscillator state synthesis by reservoir engineering
• Spectroscopy on two coupled flux qubits
• Controllable coupling of superconducting flux qubits
• Tunable coupling in circuit quantum electrodynamics with a superconducting V-system
• Microwave-Induced Cooling of a Superconducting Qubit
• Universal stabilization of a parametrically coupled qubit
• Coherent Quasiclassical Dynamics of a Persistent Current Qubit
• Consistency of ground state and spectroscopic measurements on flux qubits
• Four-qubit device with mixed couplings
• Quantum Phase Tomography of a Strongly Driven Qubit
• Population inversion of driven two-level systems in a structureless bath
• Large-amplitude driving of a superconducting artificial atom: Interferometry, cooling, and amplitude spectroscopy
• Protecting entanglement in superconducting qubits
• Resonant excitations of single and two-qubit systems coupled to a tank circuit
• Qubit interference at avoided crossings: The role of driving shape and bath coupling
• Environment-governed dynamics in driven quantum systems
• Dispersive readout of adiabatic phases
• Large Amplitude Harmonic Driving of Highly Coherent Flux Qubits