The Review of Laser Engineering

Topical Papers on Quantum Optics and Quantum Information Science

Topical Paper

Laser Reviews

Topical Papers on Quantum Optics and Quantum Information Science

Akira FURUSAWA

2003 Volume 31 Issue 9 Pages 582-585
Published: 2003
Released on J-STAGE: February 03, 2006

DOIhttps://doi.org/10.2184/lsj.31.582

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Deterministic Single-Photon Generation by Cavity QED

Kazuhiro HAYASAKA

2003 Volume 31 Issue 9 Pages 586-591
Published: 2003
Released on J-STAGE: February 03, 2006

DOIhttps://doi.org/10.2184/lsj.31.586

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Deterministic generation of single photons is an essential ingredient for quantum information experiments. Controlled emission of single photons into a cavity mode with high efficiency is proposed using a coupled system of an atom and a cavity. This paper reports theoretical discussions on single-photon generation by cavity quantum electrodynamics (Cavity QED) as well as recent progress in experiments with atoms and ions.

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Generation of Quantum-Correlated Twin Beams and Its Application

Katsuyuki KASAI

2003 Volume 31 Issue 9 Pages 592-598
Published: 2003
Released on J-STAGE: February 03, 2006

DOIhttps://doi.org/10.2184/lsj.31.592

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The signal and idler beams from a non-degenerate, above threshold, optical parametric oscillator have a strong quantum correlation, which are called twin beams. This correlation arises from the simultaneous generation of the signal and idler photons in the form of twin pairs of photons through the parametric down conversion, and the generated twin beams have exactly the same photon statistics. As a result, the fluctuations on the difference between the intensities of the twin beams are reduced with respect to the shot noise limit, that is, intensity-difference squeezing. We give a comprehensive overview of the generation of twin beams using the optical parametric oscillator, and the applications exploiting the quantum correlation of twin beams are presented.

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Quantum Information Experiments with Squeezed Light

Takao AOKI

2003 Volume 31 Issue 9 Pages 599-604
Published: 2003
Released on J-STAGE: February 03, 2006

DOIhttps://doi.org/10.2184/lsj.31.599

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Nonlocal correlation of an entangled state enables one to perform quantum communication. Continuous variable bipartite entangled state, or Einstein-Podolsky-Rosen state, has been employed to demonstrate bipartite quantum protocols. By generating multipartite entanglement, it is also possible to perform multipartite quantum protocols. In this paper, we review the generation and verification of continuous variable multipartite entanglement.

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Quantum Information Processing Using Electromagnetically Induced Transparency

Kouichi ICHIMURA

2003 Volume 31 Issue 9 Pages 605-611
Published: 2003
Released on J-STAGE: February 03, 2006

DOIhttps://doi.org/10.2184/lsj.31.605

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Electromagnetically induced transparency (EIT) is one of the simplest and most fundamental of schemes to control the quantum-mechanical properties of matter and light, such as the superposition of states, entanglement, and quantum interference, by using light, the nature of which is considerably known. EIT can be employed to realize quantum information processing in applications such as optical quantum logic gates, quantum memories, and quantum computers.

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Regular Papers

Laser Original

A New Optical Fiber System with Hybrid Functions of Power Delivery and Real-Time Remote Observation for YAG Laser Welding

Kiyoshi OKA

2003 Volume 31 Issue 9 Pages 612-617
Published: 2003
Released on J-STAGE: February 03, 2006

DOIhttps://doi.org/10.2184/lsj.31.612

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In the International Thermonuclear Experimental Reactor (ITER), pipe welding/cutting has to be carried out under severe gamma-ray conditions in a limited space inside the pipe. A laser and image transmitting system using a composite-type optical fiber was proposed and tested so as to weld, cut and observe inside a pipe. The composite fiber system consists of one fiber for laser transmission, a number of small fibers for image information transmission located around the laser transmission fiber, and a coupling/distributing device for laser energy and images. As a result, high-power laser transmission for welding/cutting and observation tests using the composite fiber system were successfully carried out. Based on the test results, the proposed laser and image transmission system was determined to be applicable not only in a limited space such as inside the pipe, but also in a human body for medical treatment.

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Errata

Errata on Vol.31, No.5 P340

2003 Volume 31 Issue 9 Pages 625
Published: 2003
Released on J-STAGE: February 03, 2006

DOIhttps://doi.org/10.2184/lsj.31.625

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Make some revisions in Vol.31, No.5, P340, Fig.6 Wrong:Fig.6
Right:Fig.6

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