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Semiconductor NanostructuresQuantum states and electronic transport$
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Thomas Ihn

Print publication date: 2009

Print ISBN-13: 9780199534425

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780199534425.001.0001

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Quantum information processing

Quantum information processing

Chapter:
(p.469) 22 Quantum information processing
Source:
Semiconductor Nanostructures
Author(s):

Thomas Ihn

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199534425.003.0022

Quantum information processing is a modern research topic in which many different disciplines within and beyond physics interact. This chapter first makes contact with basic concepts of classical information theory, which is often not familiar to physicists. It then introduces Shannon's entropy and related entropic quantities, revisits the sampling theorem, discusses the relation between thermodynamics, measurement, and information theory, and looks into Landauer's principle. The chapter looks into the very basics of quantum information, the description of qubits, and operations of qubits. Finally, qubit implementations are discussed based on charge and spin qubits in quantum dots. Experimental results on single and two-qubit operations, and issues of decoherence are discussed.

Keywords:   information, Shannon entropy, sampling theorem, Landauer's principle, charge qubit, spin qubit, decoherence

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