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Primeur weekly 2017-10-02

Special

2017 - Another year on the Road to Exascale: HPC applications towards exascale ...

Focus

CEA, ETP4HPC and European Commission working hard together to deliver commercial exascale by 2023 ...

Exascale supercomputing

Cartography of the cosmos ...

Quantum computing

A quantum computer to tackle fundamental science problems ...

Quantum communications bend to our needs ...

With new Microsoft breakthroughs, general purpose quantum computing moves closer to reality ...

Focus on Europe

SHAPE Sixth Call for Applications now open ...

EPCC to announce best use of ARCHER competition winners ...

Middleware

Bright Computing announces integration with IBM Power systems ...

US-based CryoEM company, SingleParticle.com, partners with Bright ...

Hardware

Cray takes aim at fast-growing HPC storage market with completion of strategic transaction of Seagate's ClusterStor storage business ...

Penguin Computing announces NVIDIA Tesla V100-based servers to drive Deep Learning and Artificial Intelligence ...

Penguin Computing announces Altus servers with AMD EPYC 7000 series high performance processors ...

Supermicro introduces broadest portfolio of GPU optimized systems for NVIDIA Tesla V100 GPUs ...

New type of supercomputer could be based on 'magic dust' combination of light and matter ...

Applications

Antonio Peña is the IEEE-CS TCHPC 2017 Award Winner for Excellence for Early Career Researchers in HPC ...

University of Texas at El Paso researchers use supercomputers to understand the fundamentals of artificial photosynthesis ...

Turbocharging engine design ...

The sublime challenge of jet noise ...

Mapping black hole collisions gives astronomers - and hitchhikers - a new guide ...

George Washington-led consortium and FDA release new specifications to advance genomic data analysis ...

Artificial intelligence for obtaining chemical fingerprints ...

IBM Research and UC San Diego collaborate to advance the use of Artificial Intelligence for Healthy Living ...

Dresden researchers have pioneered a brain-network bio-inspired algorithm to predict new therapeutic targets of approved drugs ...

The Cloud

IBM unveils a new high-powered analytics system for fast access to data science ...

HPE chooses Mellanox Spectrum to power StoreFabric M-series switches ...

Quantum communications bend to our needs


This is a schematic of the emission of entangled photon pairs from a quantum dot. Credit: Sascha Kolatschek.
26 Sep 2017 Washington, D.C. - The potential for photon entanglement in quantum computing and communications has been known for decades. One issue impeding immediate application is that many photon entanglement platforms don't operate within the range used by most forms of telecommunication. Researchers have started to unravel the mysteries of entangled photons, demonstrating a technique that uses semiconductor quantum dots to bend photons to the wavelengths used by today's popular C-band standards. They report their work inApplied Physics Letters.

"We have demonstrated the emission of polarization-entangled photons from a quantum dot at 1550 nanometers for the first time ever", stated Simone Luca Portalupi, one of the work's authors and a senior scientist at the Institute of Semiconductor Optics and Functional Interfaces at the University of Stuttgart. "We are now on the wavelength that can actually carry quantum communication over long distances with existing telecommunication technology."

The researchers used quantum dots created from an indium arsenide and gallium arsenide platform, producing pure single photons and entangled photons. Unlike parametric down-conversion techniques, quantum dots allow for photons to be emitted only one at a time and on demand, crucial properties for quantum computing. A distributed Bragg reflector, which is made from multiple layered materials and reflects over a wide spectrum, then directed the photons to a microscope objective, allowing them to be collected and measured.

Researchers and industry leaders have found that the C-band - a specific range of infrared wavelengths - has become an electromagnetic sweet spot in telecommunications. Photons traveling through both optical fibers and the atmosphere within this range experience significantly less absorption, making them perfect for relaying signals across long distances.

"The telecom C-band window has the absolute minimum absorption we can achieve for signal transmission", stated Fabian Olbrich, another of the paper's authors. "As scientists have made discoveries, industry has improved technology, which has let scientists make more discoveries, and so now we have a standard that works very well and has low dispersion."

Most entangled photons originating from quantum dots, however, operate near 900 nanometers, closer to wavelengths we can see with the naked eye.

The researchers were impressed by the quality of the signal, Fabian Olbrich said. Other efforts to shift the emission wavelength of polarization-entangled photons of quantum dots toward the C-band tended to increase the exciton fine-structure splitting (FSS), a quantity that should be close to zero for entanglement generation. Fabian Olbrich's team reports their experiment experienced less than one-fifth as much FSS as other studies in the literature.

"The chance to find a quantum dot that is able to emit polarization-entangled photons with high fidelity is quite high for our specific study", Fabian Olbrich stated.

With each successful experiment, the quantum communications community is seeing its field bend toward greater applicability in today's telecommunications industry. Researchers hope that one day, entangled photons will impact cryptography and secure satellite communications.

"The hard part now is to combine all the advantages of the system and fulfill prerequisites such as high photon indistinguishability, high temperature operation, increased photon flux and out coupling efficiency that would make them work", Fabian Olbrich stated.

The article, " Polarization-entangled photons from an InGaAs-based quantum dot emitting in the telecom C-band ", is authored by Fabian Olbrich, Jonatan Höschele, Markus Müller, Jan Kettler, Simone Luca Portalupi, Matthias Paul, Michael Jetter and Peter Michler. The article has appeared inApplied Physics Letterson September 26, 2017.

Source: American Institute of Physics

Back to Table of contents

Primeur weekly 2017-10-02

Special

2017 - Another year on the Road to Exascale: HPC applications towards exascale ...

Focus

CEA, ETP4HPC and European Commission working hard together to deliver commercial exascale by 2023 ...

Exascale supercomputing

Cartography of the cosmos ...

Quantum computing

A quantum computer to tackle fundamental science problems ...

Quantum communications bend to our needs ...

With new Microsoft breakthroughs, general purpose quantum computing moves closer to reality ...

Focus on Europe

SHAPE Sixth Call for Applications now open ...

EPCC to announce best use of ARCHER competition winners ...

Middleware

Bright Computing announces integration with IBM Power systems ...

US-based CryoEM company, SingleParticle.com, partners with Bright ...

Hardware

Cray takes aim at fast-growing HPC storage market with completion of strategic transaction of Seagate's ClusterStor storage business ...

Penguin Computing announces NVIDIA Tesla V100-based servers to drive Deep Learning and Artificial Intelligence ...

Penguin Computing announces Altus servers with AMD EPYC 7000 series high performance processors ...

Supermicro introduces broadest portfolio of GPU optimized systems for NVIDIA Tesla V100 GPUs ...

New type of supercomputer could be based on 'magic dust' combination of light and matter ...

Applications

Antonio Peña is the IEEE-CS TCHPC 2017 Award Winner for Excellence for Early Career Researchers in HPC ...

University of Texas at El Paso researchers use supercomputers to understand the fundamentals of artificial photosynthesis ...

Turbocharging engine design ...

The sublime challenge of jet noise ...

Mapping black hole collisions gives astronomers - and hitchhikers - a new guide ...

George Washington-led consortium and FDA release new specifications to advance genomic data analysis ...

Artificial intelligence for obtaining chemical fingerprints ...

IBM Research and UC San Diego collaborate to advance the use of Artificial Intelligence for Healthy Living ...

Dresden researchers have pioneered a brain-network bio-inspired algorithm to predict new therapeutic targets of approved drugs ...

The Cloud

IBM unveils a new high-powered analytics system for fast access to data science ...

HPE chooses Mellanox Spectrum to power StoreFabric M-series switches ...