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Primeur weekly 2018-12-03

Quantum computing

University of Southern California scientists find a way to enhance the performance of quantum computers ...

An important step towards completely secure quantum communication networks ...

Quantum computing at scale: Australian scientists achieve compact, sensitive qubit readout ...

Atos launches construction of global R&D Lab to drive innovation in Quantum Computing ...

Focus on Europe

University of Liverpool and IBM sign joint study agreement for research and innovation ...

Atos strengthens computing capacity of national supercomputing centre in Czech Republic with the new BullSequana supercomputer ...

The whole fleet of EU Commission Flagship projects meets for the first time at ICT Vienna ...

Middleware

DDN Storage and CSIR-CEERI enter partnership to provide Artificial Intelligence as a Service solutions ...

Hardware

Paving the way: An accelerator on a microchip ...

Five nanosecond decision-making ...

European partners build efficient pilot production line for photonic chips ...

WekaIO places in top five of the Virtual Institute's IO-500 10 Node Challenge ...

University of Birmingham to deploy largest IBM POWER AI cluster in the UK ...

HPE to acquire BlueData ...

Applications

Investment helps establish Artificial Intelligence-Supercomputing Facility in Edmonton ...

NCSA Director William Gropp and NCSA Affiliate Narayana Aluru named AAAS Fellows ...

SDSC's Comet supercomputer used to create detailed flu virus simulations ...

A new way to see stress - using supercomputers ...

Computational chemistry supports research on new semiconductor technologies ...

A big step toward the practical application of 3D holography with high-performance computers ...

Vanguard to tap Cray for new Stargate Imaging security solution ...

The Cloud

VMware to drive adoption of "as-a-service" model for on-premises data centres with new solutions for AWS outposts ...

Amazon Web Services announces eight new storage services and capabilities ...

E8 Storage partners with Clustar Technology, expanding its global presence ...

Fujitsu adopts Red Hat OpenShift Container Platform for global management decision-making assistance system ...

Red Hat acquires hybrid Cloud data management provider NooBaa ...

An important step towards completely secure quantum communication networks

Researchers Michael Zugenmaier (left) and Karsten Dideriksen next to their experimental set-up. Credit: Ola Joensen.29 Nov 2018 Copenhagen - Sending information over long distances can be done by encoding messages into light pulses, and sending them through optical fibres. But there is loss in fibres, so amplification is necessary along the way. Repeaters amplify the light pulses at specific intervals along the line and voila - transatlantic communication is possible. But there is a problem: It is not completely secure. The information can be picked up, and even if it is encoded, codes can be broken.

What happens when sending quantum information, is slightly different. The information itself is not actually traveling, but is teleported via entanglement distributed in the network. The sender has one half of the entanglement, and the receiver has the other half. Entanglement is much easier to create over short distances, so the line between sender and receiver is segmented and entanglement is created between each beginning and end of the segments. If each segment is capable of storing the entanglement, the line operator can wait until entanglement is created in all segments and then perform entanglement swaps at the joints to extend the entanglement to the full distance between sender and receiver.

So storage is critical - and this is why the improvement of storage time now done by the researchers is so important. Only when entanglement is in place in the entire length of the line, the actual communication can take place. Along the way, it is totally inaccessible for anyone else, as the delicate quantum information self-destructs immediately if you try to eavesdrop or manipulate it in any way.

The storage time comes into the picture, as it actually takes some time for the information to travel in the fibres. The delicate quantum entanglement has to be stored, waiting its turn to travel through the optical fibre. It makes very good sense to aim for a system that operates at room temperature, because of the scale of such networks. If quantum repeaters have to be deployed for app. every 10 km of communication line, the benefits of a simple setup, working at room temperature, are tremendous.

The researchers at the Niels Bohr Institute have managed to boost this crucial lifespan of the quantum state at room temperature to about a quarter of a millisecond, and in this period of time, the light can travel roughly 50 km in the fibre. "So, 50 km - it is still not very far, if you want to send regional quantum information, but it is way longer than what has previously been achieved with atoms at room temperature", stated Karsten Dideriksen, PhD student on the project.

The technique itself consists of a small glass container, filled with Cæsium atoms, in which the researchers are able to load, store and retrieve single photons - particles of light - from, the quantum states necessary for the repeater. This technique improves the life span of the quantum states at room temperature a hundred times. Simplicity is key, as one has to imagine this technology, once developed to its full potential, spread out across the globe as quantum repeaters in our information networks.

The immediate perspective is, as mentioned, storage for use in secure quantum information networks, but other options like generation of on-demand single photons for quantum computing are on the table.

The researchers involved in this study are postdoc Michael Zugenmaier, PhD student Karsten B. Dideriksen, prof. Anders S. Sørensen, PhD Boris Albrecht, and prof. Eugene S. Polzik.

Source: Faculty of Science - University of Copenhagen

Back to Table of contents

Primeur weekly 2018-12-03

Quantum computing

University of Southern California scientists find a way to enhance the performance of quantum computers ...

An important step towards completely secure quantum communication networks ...

Quantum computing at scale: Australian scientists achieve compact, sensitive qubit readout ...

Atos launches construction of global R&D Lab to drive innovation in Quantum Computing ...

Focus on Europe

University of Liverpool and IBM sign joint study agreement for research and innovation ...

Atos strengthens computing capacity of national supercomputing centre in Czech Republic with the new BullSequana supercomputer ...

The whole fleet of EU Commission Flagship projects meets for the first time at ICT Vienna ...

Middleware

DDN Storage and CSIR-CEERI enter partnership to provide Artificial Intelligence as a Service solutions ...

Hardware

Paving the way: An accelerator on a microchip ...

Five nanosecond decision-making ...

European partners build efficient pilot production line for photonic chips ...

WekaIO places in top five of the Virtual Institute's IO-500 10 Node Challenge ...

University of Birmingham to deploy largest IBM POWER AI cluster in the UK ...

HPE to acquire BlueData ...

Applications

Investment helps establish Artificial Intelligence-Supercomputing Facility in Edmonton ...

NCSA Director William Gropp and NCSA Affiliate Narayana Aluru named AAAS Fellows ...

SDSC's Comet supercomputer used to create detailed flu virus simulations ...

A new way to see stress - using supercomputers ...

Computational chemistry supports research on new semiconductor technologies ...

A big step toward the practical application of 3D holography with high-performance computers ...

Vanguard to tap Cray for new Stargate Imaging security solution ...

The Cloud

VMware to drive adoption of "as-a-service" model for on-premises data centres with new solutions for AWS outposts ...

Amazon Web Services announces eight new storage services and capabilities ...

E8 Storage partners with Clustar Technology, expanding its global presence ...

Fujitsu adopts Red Hat OpenShift Container Platform for global management decision-making assistance system ...

Red Hat acquires hybrid Cloud data management provider NooBaa ...