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This research demonstrates a novel method for transferring quantum information between light and matter by leveraging measurement-induced backaction rather than traditional precise manipulation. By utilizing post-selection techniques within a hybrid spin-mechanical system, the team achieved a five-fold improvement in phase variance reduction, surpassing classical limits with significant implications for future quantum magnetometry.

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Nova Southeastern Team Bounds Phase Transfer with Cramér-Rao Limit

Quantum Zeitgeist19 august 20265 min de cititArticolul și perspectiva sunt în engleză.

Until now, transferring quantum information relied on precise, delicate manipulation of systems. This work demonstrates a new approach, using the act of measurement itself to steer phase information from multiple spins onto a mechanical oscillator. Identifying quantum coherence and spin number as key resources, this offers a pathway beyond coherent control for future quantum magnetometry.

Scientists at the Nova Southeastern University, Universidad de La Frontera and Vicerrector´ıa de Investigacion, led by Raúl Coto, have demonstrated a novel method for transferring quantum information between light and matter utilising a hybrid system comprising spins coupled to a mechanical oscillator. This platform is currently subject to extensive theoretical and experimental investigation due to its potential in quantum technologies. Previous demonstrations of quantum information transfer predominantly relied on coherent control techniques, which necessitate precise manipulation of the quantum system. However, measurement-induced backaction is increasingly recognised as a viable and potentially advantageous alternative for achieving quantum control, offering a different…

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