Long-lived memory for mesoscopic quantum bits

TL;DR

This paper presents a technique for creating long-lived quantum memory in mesoscopic systems by mapping electronic spin coherence onto nuclear ensembles, enabling storage of quantum information for seconds.

Contribution

It introduces a reversible mapping method for electronic spin coherence onto nuclear states, enhancing quantum memory longevity in mesoscopic systems.

Findings

Reversible transfer of coherence between electronic spins and nuclei.

Quantum memory storage times extend to seconds.

Feasibility confirmed through detailed coherence analysis.

Abstract

We describe a technique to create long-lived quantum memory for quantum bits in mesoscopic systems. Specifically we show that electronic spin coherence can be reversibly mapped onto the collective state of the surrounding nuclei. The coherent transfer can be efficient and fast and it can be used, when combined with standard resonance techniques, to reversibly store coherent superpositions on the time scale of seconds. This method can also allow for ``engineering'' entangled states of nuclear ensembles and efficiently manipulating the stored states. We investigate the feasibility of this method through a detailed analysis of the coherence properties of the system.