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arXiv · 2211.17060

Resonant weak-value enhancement for solid-state quantum metrology

Mahadevan Subramanian·Amal Mathew·Bhaskaran Muralidharan
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Abstract

Quantum metrology that employs weak-values can potentially effectuate parameter estimation with an ultra-high sensitivity and has been typically explored across quantum optics setups. Recognizing the importance of sensitive parameter estimation in the solid-state, we propose a spintronic device platform to realize this. The setup estimates a very weak localized Zeeman splitting by exploiting a resonant tunneling enhanced magnetoresistance readout. We establish that this paradigm offers nearly optimal performance with a quantum Fisher information enhancement of about $10^4$ times that of single high-transmissivity barriers. The obtained signal also offers a high sensitivity in the presence of dephasing effects typically encountered in the solid state. These results put forth definitive possibilities in harnessing the inherent sensitivity of resonant tunneling for solid-state quantum metrology with potential applications, especially, in the sensitive detection of small induced Zeeman effects in quantum material heterostructures.

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Mahadevan Subramanian, Amal Mathew, Bhaskaran Muralidharan. 2022-11-30. Resonant weak-value enhancement for solid-state quantum metrology. https://arxiv.org/abs/2211.17060

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