New Material Based On Graphene Will Improve The Quantum Computer

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A joint team of researchers from the University of Vienna and the Institute of Photonic Sciences in Barcelona developed a new material which is made from a single sheet of carbon atoms. Analysis has shown that the custom graphene structure allows single photons to interact with other atoms. Since photons do not tend to interact with their surroundings, they were deemed to be an excellent vehicle for the storage and transport of quantum information. However, the same trait complicates the task of building a quantum computer since it is challenging to access and change the information which is encoded within photons.

To build a functional quantum computer each photon has to change the state of a second. This will be called a quantum logic gate, and millions are needed to build a quantum computer. One method involves the use of a nonlinear material which allows two photons to interact within the boundary of the material. The major downside is represented by the fact that nonlinear materials aren’t efficient for the building of a quantum logic gate.

New Material Based On Graphene Will Improve The Quantum Computer

To facilitate the building process, the team of researchers suggests that plasmons could be created in graphene. The potential of this material is quite high. The 2-D structure uses a single layer of carbon particles which follow a honeycomb structure. The specific layout of the electrons found in graphene allows the existence of strong nonlinear interactions and long-lived plasmons.

A quantum logic gate based on this material facilitates the interaction between plasmons placed in nanoribbons which interact by using their electric field. If each plasmon remains in its ribbon, several gates can be applied over the plasmons, a process which is needed for quantum computation. The specific nonlinear interaction feature of graphene will block plasmons from jumping in the same ribbon. The new scheme will harness several distinctive properties possessed by graphene, with each of them being observed individually. The results of the research were published in a scientific journal.


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