Qubit decoherence by low-frequency noise

Abstract

We have derived explicit non-perturbative expression for decoherence of quantum oscillations in a qubit by low-frequency noise. Decoherence strength is controlled by the noise spectral density at zero frequency while the noise correlation time $\tau$ determines the time $t$ of crossover from the $1/\sqrt{t}$ to the exponential suppression of coherence. We also performed Monte Carlo simulations of qubit dynamics with noise which agree with the analytical results and show that most of the conclusions are valid for both Gaussian and non-Gaussian noise.

4 pages, 2 figures

References in corpus (13)

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Manipulating the Quantum State of an Electrical Circuit
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Concepts and methods in the theory of open quantum systems
• Quantum oscillations in two coupled charge qubits
• Theory of the spin bath
• Decoherence and 1/f noise in Josephson qubits
• Charge echo in a Cooper-pair box
• Coherent dynamics of a Josephson charge qubit
• Continuous Monitoring of Rabi Oscillations in a Josephson Flux Qubit
• Coherent oscillations in a superconducting multi-level quantum system
• Dephasing due to background charge fluctuations
• Dephasing of qubits by transverse low-frequency noise

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• Engineering decoherence for two-qubit systems interacting with a classical environment
• Decoherence of a Josephson qubit due to coupling to two level systems
• Simple master equations for describing driven systems subject to classical non-Markovian noise
• Quantum mechanical approach to decoherence and relaxation generated by fluctuating environment
• Effective dephasing for a qubit interacting with a transverse classical field
• Broadband noise decoherence in solid-state complex architectures
• Effects of external driving on the coherence time of a Josephson junction qubit in a bath of two level fluctuators
• Influence of low-frequency noise on macroscopic quantum tunneling in superconducting circuits
• Dynamical nuclear spin polarization in a quantum dot with an electron spin driven by electric dipole spin resonance