Controlling decoherence via PT-symmetric non-Hermitian open quantum systems

Publication date: Available online 3 September 2019Source: Physics Letters AAuthor(s): Sanjib Dey, Aswathy Raj, Sandeep K. GoyalAbstractWe 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.

Source: Physics Letters A - September 4, 2019 Category: Physics Source Type: research