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June 1999

Volume 52, Issue 6

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Battling Decoherence: The Fault‐Tolerant Quantum Computer

John Preskill
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Quantum computers have the potential to do certain calculations faster than any foreseeable classical computers, but their success will depend on preserving complex coherent quantum states. Recent discoveries have shown us how to do that.

Electron Spin and Optical Coherence in Semiconductors

David D. Awschalom and James M. Kikkawa
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Using ultrafast laser pulses and magnetic fields, electron‐hole pairs in semiconductors may be carefully manipulated, and electron spin states can be preserved over surprisingly long times and distances.

Revisiting the Black Hole

Roger Blandford and Neil Gehrels
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A resurgence of theoretical and observational interest in black holes has given new impetus to the study of these intriguing objects.
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Physics Update

Phillip F. Schewe and Stephen G. Benka
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Students Have Trouble Accessing Physics Journals, APS Offers Range of Options

Kenneth S. Ganezer and Thomas J. McIlrath
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Reasons Behind 1950s Oppenheimer Security Decision Are Debated

Ben R. Oppenheimer, Kurt Gottfried, and Harry Lustig
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Radiation Discoverer Rutherford was Alpha Male in Deed and Word

Montague Cohen and Harry Lustig
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More on the Sociology of Science—and a Note on Kant's Position

Harry J. Lipkin and IngA Karliner
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US Federal Scientists Shouldn't Get Free Passage to India

Robert A. Myers
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Corrections

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New Data from Mars Hint at a Dynamic Past

Barbara Goss Levi
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Magnetic measurements suggest that a process akin to Earth's seafloor spreading once operated on Mars.

Traveling‐Wave Thermoacoustic Heat Engines Attain High Efficiency

Richard Fitzgerald
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A new design efficiently converts heat into useful work without any moving parts.

Adiabatic Quantum Electron Pump Produces DC Current

Gloria B. Lubkin
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You can control the flow of electrons in a quantum dot by cyclic changes in the wavefunction.

Experiments at Jefferson Lab and MIT Probe for Strange Quarks in the Proton

Bertram Schwarzschild
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If you can measure a parts‐per‐million parity violation in the elastic scattering of electrons off protons with enough precision, you get to look at the strangeness structure of the proton. These demanding experiments are under way at accelerators old and new.
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Annals of the Former World

John McPhee and W. Gary Ernst, Reviewer
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String Theory

Joseph Polchinski and Jeffrey A. Harvey, Reviewer
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Accretion Processes in Star Formation

Lee Hartmann and Jim Stone, Reviewer
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Physics in the 20th Century

Curt Suplee and Robert H. March, Reviewer
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Reasoning with the Infinite: From the Closed World to the Mathematical Universe

Michel Blay and Domenico Bertoloni Meli, Reviewer
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Introduction to Bioanalytical Sensors

Alice J. Cunningham and Robert H. Austin, Reviewer
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New Books

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Focus on Magnetism

Lawrence G. Rubin
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Three to Receive London Prize in Helsinki

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In Brief

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FREE

Nicholas Kurti

Ralph Scurlock
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FREE

Barry Michael Lasker

Brian McLean
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FREE

Stanisław Wojciech Mrozowski

Lucjan Krause, Reviewer
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Washington Briefings

Irwin Goodwin
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Professional Master's Degrees Promise Quicker Entry into Industry Jobs

Jean Kumagai
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APS Time Line Celebrates a Century of Physics

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Duke Laser Lab Gets New Director

Toni Feder
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A Physicist Writes Mysteries about a Physicist Who Solves Mysteries

Jean Kumagai
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Tenure Is As Tenure Does

Toni Feder
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In Brief

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Web Watch

Charles Day
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