Quantum Computers and Quantum Coherence

TL;DR

This paper discusses the potential of spin-based quantum computing using quantum dots, highlighting applications, proposed architectures, and experimental considerations for advancing quantum information processing.

Contribution

It introduces a spin-quantum dot architecture for quantum computers and analyzes quantum information transmission efficiency in such systems.

Findings

Quantum dot spin systems can be used for quantum information processing.

Ballistic propagation in Fermi sea can transmit quantum information efficiently.

Various materials and measurement techniques are suitable for first-generation quantum devices.

Abstract

If the states of spins in solids can be created, manipulated, and measured at the single-quantum level, an entirely new form of information processing, quantum computing, will be possible. We first give an overview of quantum information processing, showing that the famous Shor speedup of integer factoring is just one of a host of important applications for qubits, including cryptography, counterfeit protection, channel capacity enhancement, distributed computing, and others. We review our proposed spin-quantum dot architecture for a quantum computer, and we indicate a variety of first generation materials, optical, and electrical measurements which should be considered. We analyze the efficiency of a two-dot device as a transmitter of quantum information via the ballistic propagation of carriers in a Fermi sea.