Year: 2025
Type: article
Abstract: We extend the spin-boson model of open quantum systems to the regime of quantum 1 / f η noise characterized by negative exponents of its spectral distribution. Using the numerically exact time-evolving matrix product operator, we find the dynamic regime diagram, including pseudocoherent dynamics controlled by quantum 1 / f η noise. We determine the dephasing rate and find for it an empirical formula valid at zero temperature. The bath reorganization energy depends on the infrared bath cutoff frequency, revealing an increased sensitivity of the dephasing on the measurement time of an experiment. Our results apply to a qubit as an elementary building block of a quantum computer and pave the way toward a quantum treatment of low-frequency noise in more complex architectures.
Source: Physical Review Research
DOI: 10.1103/t87m-7pwn
Authors: Florian Otterpohl, Peter Nalbach, Elisabetta Paladino, Giuseppe A. Falci, Michael Thorwart
Language: English
Topic: Quantum many-body systems
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Awards: G1648780019, G6821267586
OpenAlex ID: W4412977485