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Broadband spectroscopy of quantum noise
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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.
Forward citations
Cited by 1 Pith paper
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Efficient learning and optimizing non-Gaussian correlated noise in digitally controlled qubit systems
Digital control introduces a saturation order in noise spectroscopy: single-qubit non-Gaussian dephasing is fully characterized by spectra up to order 2L, where L is the number of time windows.
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