Locality Bound for Dissipative Quantum Transport

TL;DR

This paper establishes an upper bound on quantum diffusivity in local, translation-invariant spin systems, linking transport properties to microscopic parameters and decoherence effects, with implications for understanding dissipative quantum transport.

Contribution

It provides a novel upper bound on diffusivity in dissipative quantum systems, extending Lieb-Robinson bounds to include decoherence and interaction range effects.

Findings

Derived a diffusivity bound involving microscopic and decoherence parameters

Applied the bound to a spin half XXZ chain with dephasing

Extended Lieb-Robinson bounds to dissipative quantum transport

Abstract

We prove an upper bound on the diffusivity of a general local and translation invariant quantum Markovian spin system: $D \leq D_0 + \left(\alpha \, v_\text{LR} \tau + \beta \, \xi \right) v_\text{C}$. Here $v_\text{LR}$ is the Lieb-Robinson velocity, $v_\text{C}$ is a velocity defined by the current operator, $\tau$ is the decoherence time, $\xi$ is the range of interactions, $D_0$ is a microscopically determined diffusivity and $\alpha$ and $\beta$ are precisely defined dimensionless coefficients. The bound constrains quantum transport by quantities that can either be obtained from the microscopic interactions ($D_0, v_\text{LR}, v_\text{C},\xi$) or else determined from independent local non-transport measurements ($\tau,\alpha,\beta$). We illustrate the general result with the case of a spin half XXZ chain with on-site dephasing. Our result generalizes the Lieb-Robinson bound to constrain the sub-ballistic diffusion of conserved densities in a dissipative setting.