Physics tip sheet #9 April 17, 2002

1) Identical twin photons
V. Giovannetti, L. Maccone, J. H. Shapiro, and F. N. C. Wong
Physical Review Letters (Print issue: May 6, 2002)

Maximally entangled photons are a prime resource for quantum teleportation, communication and cryptography. However, most techniques for entangling photons achieve only partial entanglement. A new experiment using the usual experimental equipment shows how to create photons that are maximally entangled and also identical in frequency. Previous experiments had photons that matched perfectly in time rather than frequency. Frequency matching can be used to make more precise position measurements and for better clock synchronization.

Journal article: http://link.aps.org/abstract/PRL/v88/e183602

2) The attosecond camera (Two papers)
J. Itatani, F. Qur, G. L. Yudin, M. Yu. Ivanov, F. Krausz, and P. B. Corkum; and
M. Kitzler, N. Milosevic, A. Scrinzi, F. Krausz, and T. Brabec
Physical Review Letters (Print issue: April 29, 2002)

If physicists are able to probe shorter and shorter time scales, they will be able to observe the dynamics of electrons within atoms and other subatomic phenomena. Two proposals for an attosecond streak camera are able to resolve pulses of light with attosecond durations (10^-18 seconds or a billionth of a billionth of a second). X-ray photons that ionize atoms are used in these studies and the electrons that are ejected from the atoms are measured to gain information about the photons involved in the process. The authors claim the technique will allow a resolution better than 100 attoseconds.

Journal article: http://link.aps.org/abstract/PRL/v88/e173903
Journal article: http://link.aps.org/abstract/PRL/v88/e173904

3) Molecular conductivity takes shape

Contact: David Harris
American Physical Society

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