kmguru
07-11-02, 04:46 PM
No it is not the Italian Pizza....
URL: http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLRAAN000066000001012101000001&idtype=cvips&gifs=yes&jsessionid=965281026420126041
The mark of Zeno
In the fifth century BC, the Greek philosopher Zeno proposed a series of logical paradoxes that demonstrate the impossibility of motion. Almost two and a half thousand years later, scientists discovered a curious phenomenon that now bears his name — the quantum Zeno effect — in which certain systems will not change state if they are constantly observed. Now it seems that this effect (and its recently discovered converse, the anti-Zeno effect) can be understood simply as a particular instance of quantum propagation.
Zeno and anti-Zeno effects in multimode parametric down-conversion
ALFREDO LUIS
We present a simple multimode analysis of the Zeno and anti-Zeno effects in spontaneous parametric down-conversion. In this process the input vacuum is an unstable state decaying into a reservoir of down-converted modes by emitting a pair of photons. We show that the Zeno and the anti-Zeno effects are two particular examples of quantum propagation depending on the effective spectrum of down-converted modes. We show that this evolution can be easily tailored on demand and that these quantum phenomena admit a very simple explanation in terms of standard interference concepts.
Physical Review A 66, 012101 (2 July 2002)
| click here for article |
© 2002 The American Physical Society
http://www.nature.com/physics/highlights/6894-4low.jpg
URL: http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLRAAN000066000001012101000001&idtype=cvips&gifs=yes&jsessionid=965281026420126041
The mark of Zeno
In the fifth century BC, the Greek philosopher Zeno proposed a series of logical paradoxes that demonstrate the impossibility of motion. Almost two and a half thousand years later, scientists discovered a curious phenomenon that now bears his name — the quantum Zeno effect — in which certain systems will not change state if they are constantly observed. Now it seems that this effect (and its recently discovered converse, the anti-Zeno effect) can be understood simply as a particular instance of quantum propagation.
Zeno and anti-Zeno effects in multimode parametric down-conversion
ALFREDO LUIS
We present a simple multimode analysis of the Zeno and anti-Zeno effects in spontaneous parametric down-conversion. In this process the input vacuum is an unstable state decaying into a reservoir of down-converted modes by emitting a pair of photons. We show that the Zeno and the anti-Zeno effects are two particular examples of quantum propagation depending on the effective spectrum of down-converted modes. We show that this evolution can be easily tailored on demand and that these quantum phenomena admit a very simple explanation in terms of standard interference concepts.
Physical Review A 66, 012101 (2 July 2002)
| click here for article |
© 2002 The American Physical Society
http://www.nature.com/physics/highlights/6894-4low.jpg