Robust Higher-Order Hamiltonian Engineering for Quantum Sensing with Strongly Interacting Systems

Abstract

Dynamical decoupling techniques constitute an integral part of many quantum sensing platforms, often leading to orders-of-magnitude improvements in coherence time and sensitivity. Most AC sensing sequences involve a periodic echo-like structure, in which the target signal is synchronized with the echo period. We show that for strongly interacting systems, this construction leads to a fundamental sensitivity limit associated with imperfect interaction decoupling. We present a simple physical picture demonstrating the origin of this limitation, and further formalize these considerations in terms of concise higher-order decoupling rules. We then show how these limitations can be surpassed by identifying a novel sequence building block, in which the signal period matches twice the echo period. Using these decoupling rules and the resulting sequence building block, we experimentally demonstrate significant improvements in dynamical decoupling timescales and magnetic field sensitivity, opening the door for new applications in quantum sensing and quantum many-body physics.

5 pages, 3 figures, see accompanying paper "Higher-Order Methods for Hamiltonian Engineering Pulse Sequence Design" for details on Hamiltonian engineering techniques

References in corpus (5)

• Universal dynamical decoupling of a single solid-state spin from a spin bath
• Controlling many-body dynamics with driven quantum scars in Rydberg atom arrays
• Real-space imaging of non-collinear antiferromagnetic order with a single spin magnetometer
• Quantum correlation in disordered spin systems: entanglement and applications to magnetic sensing
• Higher-Order Methods for Hamiltonian Engineering Pulse Sequence Design

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• Quantum decoherence of nitrogen-vacancy spin ensembles in a nitrogen spin bath in diamond under dynamical decoupling
• Coherent Generation and Protection of Anticoherent Spin States
• Microscale Sensing with Strongly Interacting NV Ensembles at High Fields