Related papers: Exponentially-enhanced quantum sensing with non-Hermitian lattice dynamics

Exponentially-enhanced quantum sensing with non-Hermitian lattice dynamics

URL: http://arxiv.org/abs/2004.00585v1
Date: Wed, 1 Apr 2020 17:14:14 GMT
Title: Exponentially-enhanced quantum sensing with non-Hermitian lattice dynamics
Authors: Alexander McDonald, Aashish A. Clerk
Abstract summary: We show that certain asymmetric non-Hermitian tight-binding models with a $mathbbZ$ symmetry yield a pronounced sensing advantage. Our setup is directly compatible with a variety of quantum optical and superconducting circuit platforms.
Score: 77.34726150561087
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We study how unique features of non-Hermitian lattice systems can be harnessed to improve Hamiltonian parameter estimation in a fully quantum setting. While the so-called non-Hermitian skin effect does not provide any distinct advantage, alternate effects yield dramatic enhancements. We show that certain asymmetric non-Hermitian tight-binding models with a $\mathbb{Z}_2$ symmetry yield a pronounced sensing advantage: the quantum Fisher information per photon increases exponentially with system size. We find that these advantages persist in regimes where non-Markovian and non-perturbative effects become important. Our setup is directly compatible with a variety of quantum optical and superconducting circuit platforms, and already yields strong enhancements with as few as three lattice sites.

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