Low-temperature Quantum Metrology Enhanced by Strong Couplings

• URL: http://arxiv.org/abs/2412.01028v1
• Date: Mon, 02 Dec 2024 01:22:08 GMT
• Title: Low-temperature Quantum Metrology Enhanced by Strong Couplings
• Authors: Ze-Zhou Zhang, Hong-Gang Luo, Wei Wu,
• Abstract summary: We propose a strategy to eliminate the error-divergence problem by utilizing the strong coupling effects. Our result reveals the importance of the non-Markovianity in quantum technologies.
• Score: 3.543616009111265
• License:
• Abstract: Equilibrium probes have been widely used in various noisy quantum metrology schemes. However, such an equilibrium-probe-based metrology scenario severely suffers from the low-temperature-error divergence problem in the weak-coupling regime. To circumvent this limit, we propose a strategy to eliminate the error-divergence problem by utilizing the strong coupling effects, which can be captured by the reaction-coordinate mapping. The strong couplings induce a noncanonical equilibrium state and greatly enhance the metrology performance. It is found that our metrology precision behaves as a polynomial-type scaling relation, which suggests the reduction of temperature can be used as a resource to improve the metrology performance. Our result is sharply contrary to that of the weakcoupling case, in which the metrology precision exponentially decays as the temperature decreases. Paving a way to realize a high-precision noisy quantum metrology at low temperatures, our result reveals the importance of the non-Markovianity in quantum technologies.

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