Non-Markovian qubit decoherence during dispersive readout
arXiv:1205.2315 · doi:10.1103/PhysRevA.85.062123
Abstract
We study qubit decoherence under generalized dispersive readout, i.e., we investigate a qubit coupled to a resonantly driven dissipative harmonic oscillator. We provide a complete picture by allowing for arbitrarily large qubit-oscillator detuning and by considering also a coupling to the square of the oscillator coordinate, which is relevant for flux qubits. Analytical results for the decoherence time are obtained by a transformation of the qubit-oscillator Hamiltonian to the dispersive frame and a subsequent master equation treatment beyond the Markov limit. We predict a crossover from Markovian decay to a decay with Gaussian shape. Our results are corroborated by the numerical solution of the full qubit-oscillator master equation in the original frame.
arXiv comment8 pages, 3 figures
References in corpus (30)
- Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
- Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
- Introduction to Quantum Noise, Measurement and Amplification
- Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
- Resolving photon number states in a superconducting circuit
- Coherent dynamics of a flux qubit coupled to a harmonic oscillator
- Qubit-oscillator systems in the ultrastrong-coupling regime and their potential for preparing nonclassical states
- Dephasing of a superconducting qubit induced by photon noise
- Dispersive regime of circuit QED: photon-dependent qubit dephasing and relaxation rates
- Qubit-oscillator dynamics in the dispersive regime: analytical theory beyond rotating-wave approximation
- Floquet-Markov description of the parametrically driven, dissipative harmonic quantum oscillator
- Dephasing of solid-state qubits at optimal points
- Light-matter excitations in the ultra-strong coupling regime
- Initial decoherence in solid state qubits
- High-contrast dispersive readout of a superconducting flux qubit using a nonlinear resonator
- Dynamics of the spin-boson model with a structured environment
- Direct Observation of Josephson Capacitance
- Dynamical suppression of telegraph and 1/f noise due to quantum bistable fluctuator
- Non-linear dispersive regime of cavity QED: The dressed dephasing model
- Low-frequency measurement of the tunneling amplitude in a flux qubit
- Two-resonator circuit QED: Dissipative Theory
- Non-exponential spin relaxation in magnetic field in quantum wells with random spin-orbit coupling
- Backaction of a driven nonlinear resonator on a superconducting qubit
- Coherence control for qubits
- Quantum Zeno effect with a superconducting qubit
- Dynamics of a qubit coupled to a broadened harmonic mode at finite detuning
- Dephasing of a flux-qubit coupled to a harmonic oscillator
- Time-Resolved Measurement of a Charge Qubit
- Time-resolved qubit readout via nonlinear Josephson inductance
- Monitoring Entanglement Evolution and Collective Quantum Dynamics
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