Mesoscopic fluctuations in biharmonically driven flux qubits

TL;DR

This paper analyzes mesoscopic fluctuations in biharmonically driven flux qubits, revealing quantum bath effects and Weak Localization-like phenomena through a Floquet Markov approach, extending understanding beyond classical noise models.

Contribution

It introduces a full quantum dynamical model for flux qubits under biharmonic driving, capturing decoherence effects and revealing new fluctuation patterns not seen in phenomenological models.

Findings

Relaxation and decoherence rates depend on phase lag and flux detuning.

Fluctuation patterns differ significantly from classical noise models.

Weak Localization-like effects are demonstrated in average relaxation rates.

Abstract

We investigate flux qubits driven by a biharmonic magnetic signal, with a phase lag that acts as an effective time reversal broken parameter. The driving induced transition rate between the ground and the excited state of the flux qubit can be thought as an effective transmitance, profiting from a direct analogy between interference effects at avoided level crossings and scattering events in disordered electronic systems. For time scales prior to full relaxation but large compared to the decoherence time, this characteristic rate has been accessed experimentally and its sensitivity with both the phase lag and the dc flux detuning explored. In this way signatures of Universal Conductance Fluctuations-like effects have recently been analized in flux qubits and compared with a phenomenological model that only accounts for decoherence, as a classical noise. We here solve the full dynamics of the driven flux qubit in contact with a quantum bath employing the Floquet Markov Master equation. Within this formalism relaxation and decoherence rates result strongly dependent on both the phase lag and the dc flux detuning. Consequently, the associated pattern of fluctuations in the characteristic rates display important differences with those obtained within the mentioned phenomenological model. In particular we demonstrate the Weak Localization-like effect in the averages values of the relaxation rate. Our predictions can be tested for accessible, but longer time scales than the current experimental times.