Physics @ Berkeley
Events in Physics
Title: Quantum Computing With Trapped Ions    (Colloquia)
Start Date: 02/11/2008
Time: 4:30 pm
Location: 1 LeConte
Speaker: Dr. Hartmut Haeffner
Affiliation: Institute for Quantum Optics and Quantum Information, Innsbruck, Austria

Quantum computing holds the promise to solve certain tasks much more efficiently than methods based on classical physics. Such a quantum computing device can be realized with ions suspended in free space by electrodynamical forces. Each ion carries the quantum information encoded in its respective internal state. Using laser light these ion-qubits can be individually initialized, manipulated and read out with high fidelities. In the first part, we will discuss some of the recent advances towards an ion trap quantum computer, particularly the creation and complete characterization of entangled states with up to eight ions and implementations of whole algorithms with up to four quantum bits.

In the second part, new routes will be explored to interconnect ion trap quantum computers with each other or to other quantum computing devices. In particular, our efforts to literally wire up two trapped ions will be discussed in more detail.  These experiments are not only relevant for quantum information purposes, but could also pave the way to develop new kinds of exquisitely sensitive ``quantum'' sensors.