Abstract
We investigate the nonclassicality of an open quantum system using Leggett-Garg inequalities (LGI) which test the correlations of a single system measured at different times. Violation of LGI implies nonclassical behavior of the open system. We investigate the violation of the Leggett-Garg inequality for a two level system (qubit) spontaneously decaying under a general non-Markovian dissipative environment. A robust nonclassical behavior is shown through the violation of LGI in the non-Markovian regime of the environment. Our results are exact as we have evaluated the two-time correlation functions exactly without using quantum regression theorem. We probe quantum signatures of the open system through the exact dynamics of Leggett-Garg inequalities for a wide range of system-environment parameters beyond Born-Markov regime.
Original language | English |
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Article number | 435303 |
Journal | Journal of Physics A: Mathematical and Theoretical |
Volume | 50 |
Issue number | 43 |
DOIs | |
Publication status | Published - 2017 Sept 29 |
All Science Journal Classification (ASJC) codes
- Statistical and Nonlinear Physics
- Statistics and Probability
- Modelling and Simulation
- Mathematical Physics
- General Physics and Astronomy