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DOE OSTI · 3375293

Dressed-State Hamiltonian Engineering in a Strongly Interacting Solid-State Spin Ensemble

Gao, Haoyang [Harvard University, Cambridge, MA (United States)] (ORCID:0000000305914031)·Leitao, Nathaniel T. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000272826157)·Dandavate, Siddharth [Harvard University, Cambridge, MA (United States)]·Wyatt, Lillian B. Hughes [University of California, Santa Barbara, CA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)] (ORCID:0000000210201661)·Put, Piotr [Harvard University, Cambridge, MA (United States)] (ORCID:0000000198975049)·Mammen, Mathew [Harvard University, Cambridge, MA (United States)] (ORCID:0009000493210636)·Martin, Leigh S. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000341735161)·Park, Hongkun [Harvard University, Cambridge, MA (United States)] (ORCID:0000000195768829)·Jayich, Ania C. Bleszynski [University of California, Santa Barbara, CA (United States)] (ORCID:0000000334807032)·Lukin, Mikhail D. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000286581007)
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Abstract

In quantum science applications, ranging from many-body physics to quantum metrology, dipolar interactions in spin ensembles are often controlled via Floquet engineering. However, this technique typically reduces the interaction strength between spins and effectively weakens the coupling to a target sensing field, limiting the metrological sensitivity. In this Letter, we develop and demonstrate an alternative method that directly tunes the native dipolar interaction in an ensemble of nitrogen-vacancy (NV) centers in diamond, thereby overcoming these limitations inherent to Floquet engineering. Our approach utilizes dressed-state qubit encoding under a bias magnetic field applied perpendicular to the crystal lattice orientation. This method leads to a 3.2× enhancement of the dimensionless coherence parameter JT 2 compared to state-of-the-art Floquet engineering and a 2.6× (8.3 dB) enhanced sensitivity in ac magnetometry. Furthermore, our results provide a powerful Hamiltonian engineering tool for future studies with NV ensembles and other interacting higher-spin (S > $\frac{1}{2}$) systems.

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Gao, Haoyang [Harvard University, Cambridge, MA (United States)] (ORCID:0000000305914031), Leitao, Nathaniel T. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000272826157), Dandavate, Siddharth [Harvard University, Cambridge, MA (United States)], Wyatt, Lillian B. Hughes [University of California, Santa Barbara, CA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)] (ORCID:0000000210201661), Put, Piotr [Harvard University, Cambridge, MA (United States)] (ORCID:0000000198975049), Mammen, Mathew [Harvard University, Cambridge, MA (United States)] (ORCID:0009000493210636), Martin, Leigh S. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000341735161), Park, Hongkun [Harvard University, Cambridge, MA (United States)] (ORCID:0000000195768829), Jayich, Ania C. Bleszynski [University of California, Santa Barbara, CA (United States)] (ORCID:0000000334807032), Lukin, Mikhail D. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000286581007). 2026-05-22. Dressed-State Hamiltonian Engineering in a Strongly Interacting Solid-State Spin Ensemble. https://doi.org/10.1103/d1kx-hy93

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