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Bulletin of the American Physical Society

Two-qubit spectroscopy of spatiotemporally correlated noise in superconducting qubits. Part 2: experiment

Uwe von Lüpke, Félix Beaudoin, Leigh Norris, Youngkyu Sung, Morten Kjærgaard, Dan H. Campbell, David K. Kim, Jonilyn Yoder, Ioan-Mihai Pop, Lorenza Viola, Simon Gustavsson, William D. Oliver

Published Mar 8, 2019• 0 citations
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Noise that exhibits significant temporal and spatial correlations across multiple qubits can be especially harmful to both fault-tolerant quantum computation and quantum-enhanced metrology.However, a complete spectral characterization of the noise environment of even a two-qubit system has not been reported thus far.We propose and experimentally demonstrate a protocol for two-qubit dephasing noise spectroscopy based on continuous-control modulation.By combining ideas from spin-locking relaxometry with a statistically motivated robust estimation approach, our protocol allows for the simultaneous reconstruction of all the single-qubit and two-qubit cross-correlation spectra, including access to their distinctive nonclassical features.Only single-qubit control manipulations and state-tomography measurements are employed, with no need for entangled-state preparation or readout of two-qubit observables.While our experimental demonstration uses two superconducting qubits coupled to a shared, colored engineered noise source, our methodology is portable to a variety of dephasing-dominated qubit architectures.By pushing quantum noise spectroscopy beyond the single-qubit setting, our work heralds the characterization of spatiotemporal correlations in both engineered and naturally occurring noise environments.