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Quantum Optics$
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John Garrison and Raymond Chiao

Print publication date: 2008

Print ISBN-13: 9780198508861

Published to Oxford Scholarship Online: September 2008

DOI: 10.1093/acprof:oso/9780198508861.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 18 October 2021

Quantum information

Quantum information

(p.601) 20 Quantum information
Quantum Optics

J. C. Garrison

R. Y. Chiao

Oxford University Press

This chapter addresses quantum information transmission and processing. Quantum noise is dominant in long-haul transmission lines, even for strong signals. Amplifier noise is avoided by using a noise-free amplifier. Injecting a strongly squeezed state into an unused port of a coupler reduces branching noise. The next section explains the no-cloning theorem and the theory and experimental evidence for (imperfect) quantum cloning machines. The use of single photons for secure quantum key distribution in cryptography is then discussed. Entanglement as a quantum resource first appears in the explanation of quantum dense coding and the inverse process of quantum teleportation. The chapter ends with a brief discussion of quantum computing, including quantum parallelism, quantum logic gates, and quantum circuits. A survey of experiments in quantum computing is followed by a study of proposals for combining linear optics with local measurements to construct quantum computers.

Keywords:   branching noise, no-cloning theorem, quantum cloning machine, quantum key distribution, quantum dense coding, quantum teleportation, quantum parallelism, quantum logic gate, quantum circuit

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