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Primeur weekly 2019-05-13

Exascale supercomputing

AMD EPYC CPUs, AMD Radeon Instinct GPUs and ROCm Open Source software to power world's fastest supercomputer at Oak Ridge National Laboratory ...

U.S. Department of Energy and Cray to deliver record-setting Frontier supercomputer at ORNL ...

Cray pursues advanced research with DOE for exascale systems ...

CAAR accepting application team proposals for Frontier system ...

Quantum computing

Computing faster with quasi-particles ...

Quantum computing with graphene plasmons ...

Focus on Europe

ELIXIR and GA4GH expand collaboration ...

Netherlands eScience Center labeled "Center of Excellence" by international review committee ...

HPC stakeholders in Europe get together at EuroHPC Summit Week 2019 ...

Middleware

DDN announces intent to acquire Nexenta, a market expert in Software-Defined Storage for 5G and IoT ...

Hardware

Austria's Central Institution for Meteorology and Geodynamics improves weather nowcasting with Cray AI solutions ...

Cray reports first quarter 2019 financial results ...

CoolIT Systems announces liquid cooling solution for Intel Server System S9200WK ...

Hewlett Packard Enterprise integrates BlueData to accelerate Artificial Intelligence and data-driven innovation in the enterprise ...

Intel previews design innovation: 10nm CPU ships in June and 7nm product in 2021 ...

WekaIO Matrix selected by Mellanox Technologies to accelerate EDA workloads ...

Applications

King's College London and NVIDIA build UK's first AI platform for NHS hospitals ...

Quantum sensor for photons ...

Comet-enabled simulations showcase black holes and their magnetic bubbles ...

Ultra-secure form of virtual money proposed ...

Shaping the future of finance with HPC ...

NCSA scientist employs supercomputer simulations in Ohio gerrymandering case ...

Superfacility framework advances photosynthesis research ...

The Cloud

Supermicro introduces open private Cloud solutions based on new Red Hat Enterprise Linux 8 ...

NetApp powers data-driven organisations to succeed ...

Quantum computing with graphene plasmons


Schematic of a graphene-based two-photon gate. Credit: University of Vienna, created by Thomas Rögelsperger.
6 May 2019 Vienna - A novel material that consists of a single sheet of carbon atoms could lead to new designs for optical quantum computers. Physicists from the University of Vienna and the Institute of Photonic Sciences in Barcelona have shown that tailored graphene structures enable single photons to interact with each other. The proposed new architecture for quantum computer is published in the recent issue ofnpj Quantum Information.

Photons barely interact with the environment, making them a leading candidate for storing and transmitting quantum information. This same feature makes it especially difficult to manipulate information that is encoded in photons. In order to build a photonic quantum computer, one photon must change the state of a second. Such a device is called a quantum logic gate, and millions of logic gates will be needed to build a quantum computer. One way to achieve this is to use a so-called 'non-linear material' wherein two photons interact within the material. Unfortunately, standard nonlinear materials are far too inefficient to build a quantum logic gate.

It was recently realized that nonlinear interactions can be greatly enhanced by using plasmons. In a plasmon, light is bound to electrons on the surface of the material. These electrons can then help the photons to interact much more strongly. However, plasmons in standard materials decay before the needed quantum effects can take place.

In their new work, the team of scientists led by Prof. Philip Walther at the University of Vienna propose to create plasmons in graphene. This 2D material discovered barely a decade ago consists of a single layer of carbon atoms arranged in a honeycomb structure, and, since its discovery, it has not stopped surprising us. For this particular purpose, the peculiar configuration of the electrons in graphene leads to both an extremely strong nonlinear interaction and plasmons that live for an exceptionally long time.

In their proposed graphene quantum logic gate, the scientists show that if single plasmons are created in nanoribbons made out of graphene, two plasmons in different nanoribbons can interact through their electric fields. Provided that each plasmon stays in its ribbon multiple gates can be applied to the plasmons which is required for quantum computation. "We have shown that the strong non-linear interaction in graphene makes it impossible for two plasmons to hop into the same ribbon", confirmed Irati Alonso Calafell, first-author of this work.

Their proposed scheme makes use of several unique properties of graphene, each of which has been observed individually. The team in Vienna is currently performing experimental measurements on a similar graphene-based system to confirm the feasibility of their gate with current technology. Since the gate is naturally small, and operates at room temperature it should readily lend itself to being scaled up, as is required for many quantum technologies.

The paper titled " Quantum computing with graphene plasmons " was authored by I. Alonso Calafell, J. D. Cox, M. Radonji, J. R. M. Saavedra, F. J. García de Abajo, L. A. Rozema, and P. Walther. It has been published innpj Quantum Information5, 37 (2019) - DOI: 10.1038/s41534-019-0150-2.

Source: University of Vienna

Back to Table of contents

Primeur weekly 2019-05-13

Exascale supercomputing

AMD EPYC CPUs, AMD Radeon Instinct GPUs and ROCm Open Source software to power world's fastest supercomputer at Oak Ridge National Laboratory ...

U.S. Department of Energy and Cray to deliver record-setting Frontier supercomputer at ORNL ...

Cray pursues advanced research with DOE for exascale systems ...

CAAR accepting application team proposals for Frontier system ...

Quantum computing

Computing faster with quasi-particles ...

Quantum computing with graphene plasmons ...

Focus on Europe

ELIXIR and GA4GH expand collaboration ...

Netherlands eScience Center labeled "Center of Excellence" by international review committee ...

HPC stakeholders in Europe get together at EuroHPC Summit Week 2019 ...

Middleware

DDN announces intent to acquire Nexenta, a market expert in Software-Defined Storage for 5G and IoT ...

Hardware

Austria's Central Institution for Meteorology and Geodynamics improves weather nowcasting with Cray AI solutions ...

Cray reports first quarter 2019 financial results ...

CoolIT Systems announces liquid cooling solution for Intel Server System S9200WK ...

Hewlett Packard Enterprise integrates BlueData to accelerate Artificial Intelligence and data-driven innovation in the enterprise ...

Intel previews design innovation: 10nm CPU ships in June and 7nm product in 2021 ...

WekaIO Matrix selected by Mellanox Technologies to accelerate EDA workloads ...

Applications

King's College London and NVIDIA build UK's first AI platform for NHS hospitals ...

Quantum sensor for photons ...

Comet-enabled simulations showcase black holes and their magnetic bubbles ...

Ultra-secure form of virtual money proposed ...

Shaping the future of finance with HPC ...

NCSA scientist employs supercomputer simulations in Ohio gerrymandering case ...

Superfacility framework advances photosynthesis research ...

The Cloud

Supermicro introduces open private Cloud solutions based on new Red Hat Enterprise Linux 8 ...

NetApp powers data-driven organisations to succeed ...