Decoherence processes in a current biased dc SQUID
arXiv:cond-mat/0601522 · doi:10.1103/PhysRevB.73.180502
Abstract
A current bias dc SQUID behaves as an anharmonic quantum oscillator controlled by a bias current and an applied magnetic flux. We consider here its two level limit consisting of the two lower energy states $| 0 \right>$ and $| 1 \right>$. We have measured energy relaxation times and microwave absorption for different bias currents and fluxes in the low microwave power limit. Decoherence times are extracted. The low frequency flux and current noise have been measured independently by analyzing the probability of current switching from the superconducting to the finite voltage state, as a function of applied flux. The high frequency part of the current noise is derived from the electromagnetic environment of the circuit. The decoherence of this quantum circuit can be fully accounted by these current and flux noise sources.
4 pages, 4 figures
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Cited by in corpus (13)
- Decoherence of flux qubits due to 1/f flux noise
- Flux qubit noise spectroscopy using Rabi oscillations under strong driving conditions
- Strong tunable coupling between a superconducting charge and phase qubit
- Correlated flux noise and decoherence in two inductively coupled flux qubits
- Rabi-like oscillations of an anharmonic oscillator: classical versus quantum interpretation
- Maximally entangling tripartite protocols for Josephson phase qubits
- Nanosecond quantum state detection in a current biased dc SQUID
- Quantum measurements without macroscopic superpositions
- Analysis of measurement errors for a superconducting phase qubit
- Detecting Current Noise with a Josephson Junction in the Macroscopic Quantum Tunneling Regime
- Dissipative dynamics of circuit-QED in the mesoscopic regime
- Effect of Ohmic environment on optimally controlled flux-biased phase qubit
- Measuring the distribution of current fluctuations through a Josephson junction with very short current pulses