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(a) Time evolution F(t) modulated by the oscillator with different λ. (b) Spectral density and modulated spectral density . When λ = 0, it become . (c) Quality factor as a function of λ for different dissipative strength. (d) Phase diagram of coherent-incoherent transition in the presence of oscillator tuning. The scaling result α c = 0.5 of the SBM (Δ/ω c ≪ 1) is shown by the red dot.
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(a) and (b) χ″(ω) as a function of ω/ω0 for different λ. (c) The correlation function C(t). (d) C(t) vs . Note C(0)=1=P(0) is numerically exact.
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We investigate the steering dissipative dynamics of a two-level system (qubit) by means of the modulation of an assisted tunneling degree of freedom which is described by a quantum-oscillator spin-boson model. Our results reveal that the decoherence rate of the qubit can be significantly suppressed and simultaneously its quality factor is enhanced. Moreover, the modulated dynamical susceptibility exhibits a multi-peak feature which is indicative of the underlying structure and measurable in experiment. Our findings demonstrate that the interplay between the combined degrees of freedom and the qubit is crucial for reducing the dissipation of qubit and expanding the coherent regime of quantum operation much large. The strategy might be used to fight against deterioration of quantum coherence in quantum information processing.
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