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Nature 440, 779-782 (6 April 2006) | doi:10.1038/nature04628; Received =
25 October 2005; ; Accepted 31 January 2006
Quantum interference between two single photons emitted by independently =
trapped atoms
J. Beugnon, M. P. A. Jones, J. Dingjan, B. Darqui=E9, G. Messin, A. =
Browaeys and P. Grangier
When two indistinguishable single photons are fed into the two input =
ports of a beam splitter, the photons will coalesce and leave together =
from the same output port. This is a quantum interference effect, which =
occurs because two possible paths-in which the photons leave by =
different output ports-interfere destructively. This effect was first =
observed in parametric downconversion (in which a nonlinear crystal =
splits a single photon into two photons of lower energy), then from two =
separate downconversion crystals, as well as with single photons =
produced one after the other by the same quantum emitter. With the =
recent developments in quantum information research, much attention has =
been devoted to this interference effect as a resource for quantum data =
processing using linear optics techniques. To ensure the scalability of =
schemes based on these ideas, it is crucial that indistinguishable =
photons are emitted by a collection of synchronized, but otherwise =
independent sources. Here we demonstrate the quantum interference of two =
single photons emitted by two independently trapped single atoms, =
bridging the gap towards the simultaneous emission of many =
indistinguishable single photons by different emitters. Our data =
analysis shows that the observed coalescence is mainly limited by =
wavefront matching of the light emitted by the two atoms, and to a =
lesser extent by the motion of each atom in its own trap.
Abstract and Full Text Links at Nature
http://www.nature.com/nature/journal/v440/n7085/abs/nature04628.html
--=20
Posted by
Robert Karl Stonjek
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<P id=3Dcite minmax_bound=3D"true"><I minmax_bound=3D"true">Nature</I> =
<B=20
minmax_bound=3D"true">440</B>, 779-782 (6 April 2006) | <ABBR=20
title=3D"Digital Object Identifier" minmax_bound=3D"true">doi</ABBR=20
minmax_bound=3D"true">:10.1038/nature04628; Received 25 October 2005; ; =
Accepted=20
31 January 2006</P>
<H2 id=3Datl minmax_bound=3D"true">Quantum interference between two =
single photons=20
emitted by independently trapped atoms</H2>
<P id=3Daug minmax_bound=3D"true">J. Beugnon<SUP>,</SUP> M. P. A. Jones, =
J. Dingjan,=20
B. Darqui=E9, G. Messin, A. Browaeys and P. Grangier</P>
<DIV id=3Dabs minmax_bound=3D"true">
<P class=3Dlead minmax_bound=3D"true">When two indistinguishable single =
photons are=20
fed into the two input ports of a beam splitter, the photons will =
coalesce and=20
leave together from the same output port. This is a quantum interference =
effect,=20
which occurs because two possible paths=97in which the photons leave by =
different=20
output ports=97interfere destructively. This effect was first observed =
in=20
parametric downconversion (in which a nonlinear crystal splits a single =
photon=20
into two photons of lower energy), then from two separate downconversion =
crystals, as well as with single photons produced one after the other by =
the=20
same quantum emitter. With the recent developments in quantum =
information=20
research, much attention has been devoted to this interference effect as =
a=20
resource for quantum data processing using linear optics techniques. To =
ensure=20
the scalability of schemes based on these ideas, it is crucial that=20
indistinguishable photons are emitted by a collection of synchronized, =
but=20
otherwise independent sources. Here we demonstrate the quantum =
interference of=20
two single photons emitted by two independently trapped single atoms, =
bridging=20
the gap towards the simultaneous emission of many indistinguishable =
single=20
photons by different emitters. Our data analysis shows that the observed =
coalescence is mainly limited by wavefront matching of the light emitted =
by the=20
two atoms, and to a lesser extent by the motion of each atom in its own=20
trap.</P>
<P class=3Dlead minmax_bound=3D"true">Abstract and Full Text Links at =
Nature<BR><A=20
href=3D"http://www.nature.com/nature/journal/v440/n7085/abs/nature04628.h=
tml">http://www.nature.com/nature/journal/v440/n7085/abs/nature04628.html=
</A></P>
<P class=3Dlead minmax_bound=3D"true"><BR>-- <BR>Posted by<BR>Robert =
Karl=20
Stonjek</P></DIV></DIV></BODY></HTML>
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