Decoherence and relaxation of a qubit coupled to an Ohmic bath directly and via an intermediate harmonic oscillator

Details Decoherence and relaxation of a qubit coupled to an Ohmic bath directly and via an intermediate harmonic oscillator Decoherence and relaxation of a qubit coupled to an Ohmic bath directly and via an intermediate harmonic oscillator

2007-03-25

arxiv.org/abs/quant-ph/0703233v3

Chem. Phys. Lett. 449 (2007) 296-303

Physics

Quantum Physics

9 pages, 6 figures

Scientific paper

10.1016/j.cplett.2007.10.074

Using the numerical path integral method we investigate the decoherence and relaxation of qubits coupled to an Ohmic bath directly and via an intermediate harmonic oscillator (IHO). Here, we suppose the oscillation frequencies of the bath modes are higher than the IHO's. When we choose suitable parameters the qubits in the two models may have almost same decoherence and relaxation times. However, the decoherence and relaxation times of the qubit in the qubit-IHO-bath model can be modulated through changing the coupling coefficients of the qubit-IHO and IHO-bath and the oscillation frequency of the IHO.

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