Speaker
Description
The behavior of many dissipative systems is generally described by a non-Markovian dynamics. Memory effects associated to non-Markovianity may lead to revival of coherence and entanglement and may be exploited as resources for quantum computation [1,2]. In this work, we study a toy model system of a qubit coupled to an incoherent impurity [3-5] which has been shown to exhibit a transition from a Markovian regime to a non-Markovian dynamics [6,7], depending on tunable parameters of the system. We investigate this behavior by quantifying the non-Markovianity [8] and by studying the frequency spectrum of the qubit coherence [9]. We study the phase diagram in several regimes and show that the transition is tuned by the qubit-impurity interaction strength and by the temperature of the impurity. Our work aims at introducing spectroscopic witnesses that are easy to measure and are able to quantify the non-Markovianity of a system.
[1] M. Tsitsishvili, D. Poletti, M. Dalmonte, and G. Chiriacò, “Measurement induced transitions in non-markovian free fermion ladders,” (2023), arXiv:2307.06624 [quant-ph].
[2] D. Gribben, J. Marino, and S. P. Kelly, “Markovian to non-markovian phase transition in the operator dynamics of a mobile impurity,” (2024), arXiv:2401.17066 [quant-ph].
[3] E. Paladino, L. Faoro, G. Falci, and R. Fazio, Phys. Rev. Lett. 88, 228304 (2002);
[4] E. Paladino, L. Faoro, A. D’Arrigo, and G. Falci, Physica E: Low-dimensional Systems and Nanostructures 18, 29–30 (2003).
[5] Paladino, E., Faoro, L., Falci, G. Advances in Solid State Physics, 43 747 (2003)
[6] E. Paladino, M. Sassetti, G. Falci, and U. Weiss, Phys. Rev. B 77, 041303 (2008).
[7] E. Paladino, Y. M. Galperin, G. Falci, and B. L. Altshuler, Rev. Mod. Phys. 86, 361 (2014).
[8] H.P. Breuer, E. Laine and J. Piilo, Phys. Rev. Lett. 103, 210401 (2009)
[9] C. Benedetti, M. G. A. Paris, and S. Maniscalco, Phys. Rev. A 89, 012114 (2014).
| Abstract category | Quantum Optics |
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