Related papers: Broadband spectroscopy of quantum noise

Broadband spectroscopy of quantum noise

URL: http://arxiv.org/abs/2402.10438v1
Date: Fri, 16 Feb 2024 04:08:38 GMT
Title: Broadband spectroscopy of quantum noise
Authors: Yuanlong Wang and Gerardo A. Paz-Silva
Abstract summary: We show how one can characterize the noise a quantum bath generates across a wide range of frequencies. We leverage an exact expression for the dynamics of the probe in the presence of non-$pi$ pulses.
Score: 0.7252027234425334
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Characterizing noise is key to the optimal control of the quantum system it affects. Using a single-qubit probe and appropriate sequences of $\pi$ and non-$\pi$ pulses, we show how one can characterize the noise a quantum bath generates across a wide range of frequencies -- including frequencies below the limit set by the probe's $\mathbb{T}_2$ time. To do so we leverage an exact expression for the dynamics of the probe in the presence of non-$\pi$ pulses, and a general inequality between the symmetric (classical) and anti-symmetric (quantum) components of the noise spectrum generated by a Gaussian bath. Simulation demonstrates the effectiveness of our method.

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