Quantum Walks With Neutral Atoms: Quantum Interference Effects of One and Two Particles

TL;DR

This paper demonstrates advanced quantum walk experiments with neutral atoms, showcasing quantum interference effects for one and two particles, and introduces a novel state-dependent transport technique for controlling spin-selective sublattices.

Contribution

It presents a new state-dependent transport method enabling independent control of sublattices and explores quantum interference effects with neutral atoms in quantum walks.

Findings

Violation of Leggett-Garg inequality with single particles

Observation of two-particle quantum interference effects

Foundation for studying interacting quantum walks of neutral atoms

Abstract

We report on the state of the art of quantum walk experiments with neutral atoms in state-dependent optical lattices. We demonstrate a novel state-dependent transport technique enabling the control of two spin-selective sublattices in a fully independent fashion. This transport technique allowed us to carry out a test of single-particle quantum interference based on the violation of the Leggett-Garg inequality and, more recently, to probe two-particle quantum interference effects with neutral atoms cooled into the motional ground state. These experiments lay the groundwork for the study of discrete-time quantum walks of strongly interacting, indistinguishable particles to demonstrate quantum cellular automata of neutral atoms.