The Mudcat Café TM
Thread #70797 Message #1209097
Posted By: Amos
17-Jun-04 - 12:29 AM
Thread Name: BS: What Do Physicists Think About?? IV
Subject: BS: What Do Physicists Think About?? IV
There is a remote chance this could be extremely important. Controlling the connection between entangled particles means there is a conceivable path to remote control of matter, teleportation and FTL drives. Just maybe.
A From the current edition of Nature magazine:
Deterministic quantum teleportation of atomic qubits
M. D. BARRETT1,*, J. CHIAVERINI1, T. SCHAETZ1, J. BRITTON1, W. M. ITANO1, J. D. JOST1, E. KNILL2, C. LANGER1, D. LEIBFRIED1, R. OZERI1 & D. J. WINELAND1
1 Time and Frequency Division, NIST, Boulder, Colorado 80305, USA 2 Mathematical and Computational Sciences Division, NIST, Boulder, Colorado 80305, USA * Present address: Department of Physics, University of Otago, PO Box 56, Dunedin, New Zealand
Correspondence and requests for materials should be addressed to D.J.W. (djw@boulder.nist.gov)
Quantum teleportation provides a means to transport quantum information efficiently from one location to another, without the physical transfer of the associated quantum-information carrier. This is achieved by using the non-local correlations of previously distributed, entangled quantum bits (qubits). Teleportation is expected to play an integral role in quantum communication and quantum computation. Previous experimental demonstrations have been implemented with optical systems that used both discrete and continuous variables, and with liquid-state nuclear magnetic resonance. Here we report unconditional teleportation of massive particle qubits using atomic (9Be+) ions confined in a segmented ion trap, which aids individual qubit addressing. We achieve an average fidelity of 78 per cent, which exceeds the fidelity of any protocol that does not use entanglement. This demonstration is also important because it incorporates most of the techniques necessary for scalable quantum information processing in an ion-trap system.