Controlling decoherence via PT-symmetric non-Hermitian open quantum systems |
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Authors: | Sanjib Dey Aswathy Raj Sandeep K Goyal |
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Institution: | Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, SAS Nagar, Manauli 140306, India |
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Abstract: | 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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Keywords: | Corresponding author Decoherence Quantum entanglement Open quantum systems PT-symmetry Non-Hermitian Hamiltonians |
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