Pseudo-Rabi oscillations in superconducting flux qubits in the classical regime

Abstract

Nonlinear effects in mesoscopic devices can have both quantum and classical origins. We show that a three-Josephson-junction (3JJ) flux qubit in the _classical_ regime can produce low-frequency oscillations in the presence of an external field in resonance with the (high-frequency) harmonic mode of the system, $\omega$. Like in the case of_quantum_ Rabi oscillations, the frequency of these pseudo-Rabi oscillations is much smaller than $\omega$ and scales approximately linearly with the amplitude of the external field. This classical effect can be reliably distinguished from its quantum counterpart because it can be produced by the external perturbation not only at the resonance frequency $\omega$ and its subharmonics ($\omega /n$), but also at its overtones, $n\omega$.

References in corpus (12)

• Superconducting Circuits and Quantum Information
• Two-level systems driven by large-amplitude fields
• Four-qubit device with mixed couplings
• Switchable resonant coupling of flux qubits
• Temperature dependence of coherent oscillations in Josephson phase qubits
• Parametric control of a superconducting flux qubit
• Rabi oscillations in a qubit coupled to a quantum two-level system
• Rabi-type oscillations in a classical Josephson junction
• Generalized switchable coupling for superconducting qubits using double resonance
• Distinguishing quantum from classical oscillations in a driven phase qubit
• Measurement of the ground-state flux diagram of three coupled qubits as a first step towards the demonstration of adiabatic quantum computation
• Simulating Ramsey-Type Fringes in a Pulsed Microwave-Driven Classical Josephson Junction

Cited by in corpus (5)

• Witnessing Quantum Coherence: from solid-state to biological systems
• Distinguishing quantum and classical transport through nanostructures
• Detecting quantum-coherent nanomechanical oscillations using the current-noise spectrum of a double quantum dot
• Reconciling quantum and classical spectral theories of ultrastrong coupling: Role of cavity bath coupling and gauge corrections
• Investigation of resonant and transient phenomena in Josephson junction flux qubits