Noise spectroscopy of a quantum-classical environment with a diamond qubit

Anno: 2018

Autori: Hernandez Gomez S., Poggiali F., Cappellaro P., Fabbri N.

Affiliazione autori: Univ Firenze, LENS European Lab Non Linear Spect, I-50019 Sesto Fiorentino, Italy; CNR, INO, I-50019 Sesto Fiorentino, Italy; MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA.

Abstract: Knowing a quantum system’s environment is critical for its practical use as a quantum device. Qubit sensors can reconstruct the noise spectral density of a classical bath, provided long enough coherence time. Here, we present a protocol that can unravel the characteristics of a more complex environment, comprising both unknown coherently coupled quantum systems, and a larger quantum bath that can be modeled as a classical stochastic field. We exploit the rich environment of a nitrogen-vacancy center in diamond, tuning the environment behavior with a bias magnetic field, to experimentally demonstrate our method. We show how to reconstruct the noise spectral density even when limited by relatively short coherence times, and identify the local spin environment. Importantly, we demonstrate that the reconstructed model can have predictive power, describing the spin qubit dynamics under control sequences not used for noise spectroscopy, a feature critical for building robust quantum devices. At lower bias fields, where the effects of the quantum nature of the bath are more pronounced, we find that more than a single classical noise model are needed to properly describe the spin coherence under different controls, due to the back action of the qubit onto the bath.

Giornale/Rivista: PHYSICAL REVIEW B

Volume: 98 (21)      Da Pagina: 214307-1  A: 214307-6

Maggiori informazioni: The authors thank F. S. Cataliotti for critical reading of the manuscript and M. Inguscio for supporting the project. This work was supported by EU-FP7 ERC Starting Q-SEnS2 (Grant No. 337135) and by NSF Grant No. EECS1702716.
Parole chiavi: Open quantum systems and decoherence; Quantum control; Quantum sensing; Nitrogen-vacancy centers in diamond;
DOI: 10.1103/PhysRevB.98.214307

Citazioni: 34
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-11
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