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Controlling decoherence via mathcal{PT}-symmetric non-Hermitian open quantum systems

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arxiv 1907.11088 v1 pith:HBBSPDI6 submitted 2019-07-23 quant-ph

Controlling decoherence via $\mathcal{PT}$-symmetric non-Hermitian open quantum systems

classification quant-ph
keywords bathsystemnon-hermitiannon-hermiticityspindecoherencedynamicseffect
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We have studied the effect of a non-Hermitian Bosonic bath on the dynamics of a two-level spin system. The non-Hermitian Hamiltonian of the bath is chosen such that it converges to the harmonic oscillator Hamiltonian when the non-Hermiticity is switched off. We calculate the dynamics of the spin system and found that the non-Hermiticity can have positive as well as negative effects on the coherence of the system. However, the decoherence can be completely eliminated by choosing the non-Hermiticity parameter and the phase of the system bath interaction appropriately. We have also studied the effect of this bath on the entanglement of a two-spin system when the bath is acting only on one spin.

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