Relaxation of Josephson qubits due to strong coupling to two-level systems

Abstract

We investigate the energy relaxation (T1) process of a qubit coupled to a bath of dissipative two-level fluctuators (TLF). We consider the fluctuators strongly coupled to the qubit both in the limit of spectrally separated single TLF's as well as in the limit of spectrally dense TLF's. We conclude that the avoided level crossings, usually attributed to very strongly coupled single TLF's, could also be caused by many weakly coupled spectrally dense fluctuators.

11+ pages, 10 figures, citations added, discussion extended

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Cited by in corpus (22)

• 1/f noise: implications for solid-state quantum information
• Towards understanding two-level-systems in amorphous solids -- Insights from quantum circuits
• Measuring the temperature dependence of individual two-level systems by direct coherent control
• Decoherence of a qubit due to a quantum fluctuator or to a classical telegraph noise
• Phonon engineering of atomic-scale defects in superconducting quantum circuits
• Rabi spectroscopy of a strongly driven qubit-fluctuator system
• Multi-photon spectroscopy of a hybrid quantum system
• Microscopic models for charge-noise-induced dephasing of solid-state qubits
• Collective quantum coherent oscillations in a globally coupled array of qubits
• Dual-probe decoherence microscopy: Probing pockets of coherence in a decohering environment
• Mitigating Losses of Superconducting Qubits Strongly Coupled to Defect Modes
• Quantum Dynamics of a Microwave Driven Superconducting Phase Qubit Coupled to a Two-Level System
• Waiting time distributions in a two-level fluctuator coupled to a superconducting charge detector
• Real-time simulation of flux qubits used for quantum annealing
• Modeling of Low and High Frequency Noise by Slow and Fast Fluctuators
• Jaynes Cummings treatment of superconducting resonators with dielectric loss due to two-level systems
• Solomon equations for qubit and two-level systems: Insights into non-Poissonian quantum jumps
• Influence of External Fields and Environment on the Dynamics of Phase Qubit-Resonator System
• Identification of soft modes in amorphous Al${}_2$O${}_3$ via first-principles
• $T_1$-Echo Sequence - Protecting the state of a qubit in the presence of coherent interaction
• Effect of Etching Methods on Dielectric Losses in Transmons
• Stability of superconducting resonators: motional narrowing and the role of Landau-Zener driving of two-level defects