Quantum Computing Possible with Graphene Plasmons

Published Date : May 09, 2019

The physicists at University of Vienna and the Institute of Photonic Sciences in Barcelona prove that customized graphene lattice can allow photons to interact with each other. The study shows that graphene sheets can set designs for optical quantum computers.

According to the researchers, photons barely communicate with environmental particles. This makes them the most preferred component for transmitting and storing quantum data. Although, the very same reason makes it difficult to manipulate the encoded information from them. To overcome this challenge, and develop a photon quantum computer, a single photon must be capable of changing the state of another photon.

Scientists have come up with a device, quantum logic gate, which allows a photon to change the state of the other. Therefore, to develop a photon quantum computer, at least a million such logic gates are required. This will increase the complexity of the machine than simplifying it.

What is an Effective Way to Build a Photon Quantum Computer?

Researchers believe that one way to build a photon quantum computing machine is to use “non-linear materials”. However, the life of non-linear materials are extremely low and starts decaying way before the quantum effect takes place.

Scientists found their solution in a recently discovered 2-D material, Graphene. The 2-D material is a decade old and has single layer of carbon atoms arranged in a honeycomb lattice. To fulfill the purpose of transmitting quantum data, peculiar arrangements of graphene electrons comes into play. This configuration provides a strong non-linear interaction along with plasmons that have longer decaying period.

Scientists show that graphene plasmons can interact with each other using their electric fields when they are in the created nanoribbons. However, it is mandatory for plasmons to remain in the nanoribbons while transmitting the data.