Coherence enhanced quantum metrology in a nonequilibrium optical molecule

Abstract

We explore the quantum metrology in an optical molecular system coupled to two environments with different temperatures, using a quantum master equation beyond secular approximation. We discover that the steady-state coherence originating from and sustained by the nonequilibrium condition can enhance quantum metrology. We also study the quantitative measures of the nonequilibrium condition in terms of the curl flux, heat current and entropy production at the steady state. They are found to grow with temperature difference. However, an apparent paradox arises considering the contrary behaviors of the steady-state coherence and the nonequilibrium measures in relation to the inter-cavity coupling strength. This paradox is resolved by decomposing the heat current into a population part and a coherence part. Only the latter, coherence heat current, is tightly connected to the steady-state coherence and behaves similarly with respect to the inter-cavity coupling strength. Interestingly, the coherence heat current flows from the low-temperature reservoir to the high-temperature reservoir, opposite to the direction of the population heat current. Our work offers a viable way to enhance quantum metrology for open quantum systems through steady-state coherence sustained by the nonequilibrium condition, which can be controlled and manipulated to maximize its utility. The potential applications go beyond quantum metrology and extend to areas such as device designing, quantum computation and quantum technology in general.

The errors are corrected, analytical results are added, acceptec by New J. Phys

References in corpus (15)

• Photonic quantum technologies
• Quantum thermal transistor
• Quantum Heat Engine With Multi-Level Quantum Systems
• Two-resonator circuit QED: A superconducting quantum switch
• Quantum metrology in Lipkin-Meshkov-Glick critical systems
• Optimal rectification by strongly coupled spins
• Fisher information approach to non-equilibrium phase transitions in quantum XXZ spin chain with boundary noise
• Squeezing Inequalities and Entanglement for Identical Particles
• Steady quantum coherence in non-equilibrium environment
• Curl flux, coherence, and population landscape of molecular systems: Nonequilibrium quantum steady state, energy (charge) transport, and thermodynamics
• Multiple phase estimation in quantum cloning machines
• Energy transport between two pure-dephasing reservoirs
• Steady bipartite coherence induced by non-equilibrium environment
• Nonequilibrium density matrix for simultaneous heat and charge steady-state transport in quantum open systems
• Computational complexity of non-equilibrium steady states of quantum spin chains

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