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<B>Thesis Defense</B><br><i>Quantum Teleportation Between Distant Matter Qubits</i>

Friday, April 17, 2009
12:00 AM
340 West Hall

Speaker: Steven Olmschenk

Quantum information research is driven by the prospect of using the features of quantum
physics to tackle otherwise intractable computational problems. Systems of trapped atomic
ions have proven to be one of the most promising candidates for the realization of quantum
computation due to their long trapping times, excellent coherence properties, and exquisite
control of the internal atomic states. Integrating ions (quantum memory) with photons
(distance link) offers a unique path to large-scale quantum computation and long-distance
quantum communication.

In this work, I present the implementation of a heralded photon-mediated quantum gate
between remote ions, and the employment of this gate to perform a teleportation protocol
between two ions separated by a distance of about one meter [1]. A quantum bit stored in
the hyperfine levels of a single ytterbium ion (Yb+) is teleported to a second Yb+ atom with
an average fidelity of 90% over a replete set of states. The method demonstrated here avoids
many of the issues associated with previously demonstrated motional gates, while presenting
a new set of challenges and possibilities for integration to larger systems. Ultimately, this
teleportation protocol could form the elementary constituent of a long-distance quantum
repeater. Moreover, this heralded quantum gate could be used to establish large entangled
states for measurement-based quantum computation.

[1] S. Olmschenk, D. N. Matsukevich, P. Maunz, D. Hayes, L.-M. Duan, and C. Monroe,
“Quantum Teleportation between Distant Matter Qubits,” Science 323, 486 (2009).