David Kirkpatrick

April 7, 2008

Supercomputing news

Two bits from KurzweilAI.net. First is a qutrit breakthrough making strides toward quantum computing.

The second is on a DARPA challenge for research projects offering “dramatic improvements” in areas including quantum computing.

Qutrit breakthrough brings quantum computers closer
Physics arXiv blog, April 4, 2008University of Queensland scientists have built and tested quantum logic gates that are vastly more powerful than those that have gone before by exploiting the higher dimensions available in quantum mechanics.For example, a qubit can be encoded in a photon‘s polarization. But a photon has other dimensions which can also be used to carry information, such as its arrival time, photon number or frequency. By exploiting these, a photon can easily be used as a much more powerful three level system called a qutrit.That allows a dramatic reduction in the number of gates necessary to perform a specific task. Using only three of the higher-dimension logic gates, the team has built and tested a Toffoli logic gate that could only have been constructed using 6 conventional logic gates. And they say that a computer made up of 50 conventional quantum logic gates could be built using only 9 of theirs.

 
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Uncle Sam searches for a quantum leap
NewScientist news service, April 1, 2008Under its new QuEST (Quantum Entanglement Science and Technology) program, DARPA has issued a request for proposal for research projects that address “”dramatic improvements” in “the nature, establishment, control, or transport of multi-qubit entanglement.”Applications might include parallel computing power in a quantum computer and secure communications using quantum cryptography
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February 27, 2008

Nanotechnology advances in quantum computing

Filed under: Science, Technology — Tags: , , , , , — David Kirkpatrick @ 11:52 pm

More cool nanotech. This time from the KurzweilAI.net newsletter. For reference, a qubit is a unit of quantum information.

Physicists Demonstrate Qubit-Qutrit Entanglement
PhysOrg.com, Feb. 26, 2008An international team of physicists entangled a qubit with its 3D equivalent, the “qutrit,” demonstrating a new way to handle higher-dimensional quantum information carriers.

Qubit-qutrit entanglement could lead to advantages in quantum computing, such as increased security and more efficient quantum gates, and enable novel tests of quantum mechanics. A qutrit is the quantum informationanalogue of the classical trit and carries more information: it exists in superpositions of its three basics states, while a qubit can exist in superpositions of its two states.
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