A Universal Protocol for Quantum-Enhanced Sensing via Information Scrambling

• URL: http://arxiv.org/abs/2411.12794v1
• Date: Tue, 19 Nov 2024 19:00:00 GMT
• Title: A Universal Protocol for Quantum-Enhanced Sensing via Information Scrambling
• Authors: Bryce Kobrin, Thomas Schuster, Maxwell Block, Weijie Wu, Bradley Mitchell, Emily Davis, Norman Y. Yao,
• Abstract summary: We introduce a novel protocol, which enables Heisenberg-limited quantum-enhanced sensing. We use forward and reverse time evolution to produce a coherent superposition of a "scrambled" and "unscrambled" quantum state.
• Score: 1.4950073235357226
• License:
• Abstract: We introduce a novel protocol, which enables Heisenberg-limited quantum-enhanced sensing using the dynamics of any interacting many-body Hamiltonian. Our approach - dubbed butterfly metrology - utilizes a single application of forward and reverse time evolution to produce a coherent superposition of a "scrambled" and "unscrambled" quantum state. In this way, we create metrologically-useful long-range entanglement from generic local quantum interactions. The sensitivity of butterfly metrology is given by a sum of local out-of-time-order correlators (OTOCs) - the prototypical diagnostic of quantum information scrambling. Our approach broadens the landscape of platforms capable of performing quantum-enhanced metrology; as an example, we provide detailed blueprints and numerical studies demonstrating a route to scalable quantum-enhanced sensing in ensembles of solid-state spin defects.

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