Quantum Many-Body Physics and Quantum Metrology with Floquet-Engineered Interacting Spin Systems

Improved control and manipulation of quantum systems lies at the heart of modern quantum science and technology, with broad applications ranging from quantum metrology to quantum information science and many-body physics. In this talk, I will introduce a novel framework for robust Hamiltonian engineering in interacting spin systems, which enables the efficient design of Floquet engineering pulse sequences for qubit and qudit systems that out-perform state-of-the-art control methods by orders of magnitude.



As applications of this framework, we utilize a high-density ensemble of nitrogen vacancy (NV) centers in diamond, and experimentally demonstrate significantly improved control over the disordered, interacting many-body spin system. This enabled the first solid state spin ensemble quantum sensor operating beyond the sensitivity limit imposed by interactions between sensing particles, the first full decoupling and interaction engineering of spin-1 dipolar interactions, as well as the observation and understanding of novel dynamical many-body phenomena, including discrete time crystalline order and thermalization dynamics in long-range interacting XXZ spin models. We further explore the use of NV centers for practical sensing applications, by probing embryogenesis in C. elegans with these tools.



*This work was performed at Harvard University under the supervision of Prof. Mikhail D. Lukin.