Single-Spin CCD

TL;DR

This paper demonstrates the manipulation, transport, and read-out of individual electron spins in a linear array of quantum dots, showcasing a single-spin CCD with high fidelity and potential for quantum information processing.

Contribution

It introduces a method for single-shot read-out and site-selective control of individual electron spins in a quantum dot array, enabling spin shuttling with minimal decoherence.

Findings

Achieved 97% fidelity in single-shot spin read-out.

Successfully shuttled electrons over 80 μm with negligible spin disturbance.

Demonstrated site-specific control of three electron spins in a linear array.

Abstract

Spin-based electronics or spintronics relies on the ability to store, transport and manipulate electron spin polarization with great precision. In its ultimate limit, information is stored in the spin state of a single electron, at which point also quantum information processing becomes a possibility. Here we demonstrate the manipulation, transport and read-out of individual electron spins in a linear array of three semiconductor quantum dots. First, we demonstrate single-shot read-out of three spins with fidelities of 97% on average, using an approach analogous to the operation of a charge-coupled-device (CCD). Next, we perform site-selective control of the three spins thereby writing the content of each pixel of this "Single-Spin CCD". Finally, we show that shuttling an electron back and forth in the array hundreds of times, covering a cumulative distance of 80 $\mu$m, has negligible influence on its spin projection. Extrapolating these results to the case of much larger arrays, points at a diverse range of potential applications, from quantum information to imaging and sensing.