Fault-tolerant breathing pattern in optical lattices as a dynamical quantum memory

TL;DR

This paper demonstrates a fault-tolerant dynamical quantum memory using ultracold atoms in optical lattices, where a parabolic field induces a breathing pattern that reliably revives initial states despite noise and defects.

Contribution

It introduces a novel dynamical quantum memory scheme based on breathing patterns in optical lattices, robust against fabrication defects and noise.

Findings

High-fidelity state revival at predictable times

Fault-tolerance against defects and noise

Implementation with current ultracold atom technology

Abstract

Proposals for quantum information processing often require the development of new quantum tech- nologies. However, here we build quantum memory by ultracold atoms in one-dimensional optical lattices with existing state-of-the-art technology. Under a parabolic external field, we demonstrate that an arbitrary initial state at an end of the optical lattices can time-evolve and revive, with very high fidelity, at predictable discrete time intervals. Physically, the parabolic field, can catalyze a breathing pattern. The initial state is memorized by the pattern and can be retrieved at any of the revival time moments. In comparison with usual time-independent memory, we call this a dynamical memory. Furthermore, we show that the high fidelity of the quantum state at revival time moments is fault-tolerant against the fabrication defects and even time-dependent noise.