Extreme violation of the Leggett-Garg inequality in nonunitary dynamics with complex energies
dc.contributor.author | Varma, Anant V. | |
dc.contributor.author | Muldoon, Jacob E. | |
dc.contributor.author | Paul, Sourav | |
dc.contributor.author | Joglekar, Yogesh N. | |
dc.contributor.author | Das, Sourin | |
dc.contributor.department | Physics, School of Science | |
dc.date.accessioned | 2025-01-10T19:19:49Z | |
dc.date.available | 2025-01-10T19:19:49Z | |
dc.date.issued | 2023-09 | |
dc.description.abstract | We study the Leggett-Garg inequality (LGI) of a two-level system (TLS) undergoing coherent dynamics described by a non-Hermitian Hamiltonian and Lindblad equation with no quantum jumps. The nonlinear Bloch equation for the TLS density matrix predicts violations of LGI above the TLS Lüders bound of , approaching the extremal case of LGI parameter in the -symmetric region and the -broken region. We show that these findings are reproduced by using postselection to remove instantaneous quantum jumps from a three-level system described by the Lindblad equation with a single spontaneous emission dissipator. We trace the excesses beyond the standard quantum limit of to a nonuniform speed of evolution on the Bloch sphere. Finally, we consider the effects of competing Lindblad dissipators on the postselected non-Hermitian dynamics and the viability of observing exceeding the Lüder bound and approaching its algebraic maximum of three in current experimental setups. | |
dc.eprint.version | Author's manuscript | |
dc.identifier.citation | Varma, A. V., Muldoon, J. E., Paul, S., Joglekar, Y. N., & Das, S. (2023). Extreme violation of the Leggett-Garg inequality in nonunitary dynamics with complex energies. Physical Review A, 108(3), 032202. https://doi.org/10.1103/PhysRevA.108.032202 | |
dc.identifier.uri | https://hdl.handle.net/1805/45247 | |
dc.language.iso | en | |
dc.publisher | APS | |
dc.relation.isversionof | 10.1103/PhysRevA.108.032202 | |
dc.relation.journal | Physical Review A | |
dc.rights | Publisher Policy | |
dc.source | ArXiv | |
dc.subject | open quantum systems & decoherence | |
dc.subject | quantum foundations | |
dc.subject | non-hermitian systems | |
dc.title | Extreme violation of the Leggett-Garg inequality in nonunitary dynamics with complex energies | |
dc.type | Article |