Charge-based quantum computing using single donors in semiconductors

TL;DR

This paper proposes a charge-based quantum computing scheme using single dopant atoms in semiconductors, demonstrating fast gate operations and discussing scalability prospects.

Contribution

It introduces a novel charge qubit design with rapid gate times and universal gate operations for scalable solid-state quantum computing.

Findings

Single gate times of about 50 ps or less

Fast readout using radio-frequency single electron transistor

Potential for scalable quantum computing architectures

Abstract

Solid-state quantum computer architectures with qubits encoded using single atoms are now feasible given recent advances in atomic doping of semiconductors. Here we present a charge qubit consisting of two dopant atoms in a semiconductor crystal, one of which is singly ionised. Surface electrodes control the qubit and a radio-frequency single electron transistor provides fast readout. The calculated single gate times, of order 50ps or less, are much shorter than the expected decoherence time. We propose universal one- and two-qubit gate operations for this system and discuss prospects for fabrication and scale up.