Heisenberg-limited metrology via weak-value amplification without using entangled resources

• URL: http://arxiv.org/abs/2109.03762v1
• Date: Wed, 8 Sep 2021 16:38:00 GMT
• Title: Heisenberg-limited metrology via weak-value amplification without using entangled resources
• Authors: Yosep Kim, Seung-Yeun Yoo, Yoon-Ho Kim
• Abstract summary: Weak-value amplification (WVA) provides a way for amplified detection of a tiny physical signal at the expense of a lower detection probability. We demonstrate a novel WVA scheme based on iterative interactions, achieving the Heisenberg-limited precision scaling without resorting to entanglement. Our work opens a practical pathway for achieving the Heisenberg-limited WVA without using fragile and experimentally-demanding entangled resources.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Weak-value amplification (WVA) provides a way for amplified detection of a tiny physical signal at the expense of a lower detection probability. Despite this trade-off, due to its robustness against certain types of noise, WVA has advantages over conventional measurements in precision metrology. Moreover, it has been shown that WVA-based metrology can reach the Heisenberg-limit using entangled resources, but preparing macroscopic entangled resources remains challenging. Here we demonstrate a novel WVA scheme based on iterative interactions, achieving the Heisenberg-limited precision scaling without resorting to entanglement. This indicates that the perceived advantages of the entanglement-assisted WVA are in fact due to iterative interactions between each particle of an entangled system and a meter, rather than coming from the entanglement itself. Our work opens a practical pathway for achieving the Heisenberg-limited WVA without using fragile and experimentally-demanding entangled resources.

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