L'Article

Tutoriel de Téléportation Quantique

introduction à l'optique quantique


l'effet E.P.R.


la téléportation quantique

Les Auteurs

Richard, Bill, Charles

Gilles, Claude, Asher

IBM Quantum Teleportation Page

From: Gilles Brassard
Subject: téléportation
To: theorique@IRO.UMontreal.CA
Date: Fri, 4 Jul 1997 15:12:20 -0400 (EDT)

Grande nouvelle!

Francesco de Martini, de la Sapienza a Rome, vient d'annoncer qu'il a réussi la première téléportation [quantique] ce matin à 6 heures!

- Gilles

PS il s'agit de photons. Polarisation ET position. (Une idée de Popescu)

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From: "ANTON ZEILINGER" -Anton.Zeilinger@uibk.ac.at-
To: bennettc@watson.ibm.com, brassard@IRO.UMontreal.CA,
crepeau@IRO.UMontreal.CA, P08205@prime-a.plymouth.ac.uk,
Asher Peres -peres@photon.technion.ac.il-, William.K.Wootters@williams.edu
Date: Fri, 19 Sep 1997 17:27:48 +0100

Dear Colleagues:

You all as the originators of the teleportation paper will certainly be happy to learn that we finally succeeded in realizing your proposal. What we did was to use the HV+VH state (up to an internal phase factor which is free to adjust) for the ancillary. We sent one of the two photons onto the Bell State analyzer where it meets the photon to be teleported. That photon we polarized at +45 degrees. Thus it is prepared in an equal coherent superposition of H and V. For reason of having as few optical components as possible we only analyze for the psi-minus state, i.e. HV - VH. The other ancillary then is found to be also in the +45 degree state. The experiment necessitated to use very short laser pulses (ca. 200 fs) to provide high enough probability for the ancillary to meet the photon to be teleported.

The data are very coarse but the effect is clearly visible. We are busy improving the data and adding new measurements. Yet the data rate is awfully slow. We typically have 1 three-fold coincidence per second.

The people in the work are D. Bouwmeester, J.W. Pan, M. Eibl, K. Mattle, H. Weinfurter, A.Z.

All the best
Anton
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Anton Zeilinger
Institut fuer Experimentalphysik
Universitaet Innsbruck
Technikerstrasse 25
A-6020 Innsbruck
Austria