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Primeur weekly 2016-05-17

Quantum computing

New design of primitive quantum computer finds application ...

Scientists take a major leap toward a perfect quantum metamaterial ...

A compact, efficient single photon source that operates at ambient temperatures on a chip ...

D-Wave Systems and 1QBit partner with financial industry experts to launch Quantum for Quants online community ...

Focus on Europe

Spring 2016 edition of the e-IRG newsletter available ...

Up to 150,000 euro up for grabs per European SME to fund CPS experiments ...

Alder Hey Children's Hospital set to become UK's first cognitive hospital ...

Leibniz Supercomputing Centre to host Workshop on HPC for Water Related Hazards ...

Registration still open for 9th International Workshop on Parallel Matrix Algorithms and Applications ...

Ron Perrott, an international leader in high performance computing receives ACM Distinguished Service Award ...

Middleware

Allinea tools to unleash research potential for Flemish supercomputer users ...

NSF grant to enable research computing infrastructure dedicated to science and engineering ...

Hardware

Leading thinkers convene in UK to tackle supercomputer efficiency barriers ...

Fujitsu receives order for 25 Petaflop/s supercomputer from the University of Tokyo and the University of Tsukuba ...

Call for Papers for PGAS Applications Workshop ...

IBM scientists achieve storage memory breakthrough ...

Applications

The Sun's magnetic field during the grand minimum is in fact at its maximum ...

IBM and UMBC collaborate to advance cognitive cybersecurity ...

Ten PhD students from across the USA selected as Blue Waters Graduate Fellows ...

Tiny terrors: Researcher works to uncover how bacteria develop antibiotic resistance through efflux pumps ...

Exxact Corporation extends its deep learning solutions with NVIDIA DGX-1 deep learning system ...

Engine design takes a major leap at Argonne ...

The Cloud

IBM Watson to tackle cybercrime ...

EuroFlash

TGAC installs largest SGI UV 300 supercomputer for Life Sciences worldwide to solve the most demanding data intensive problems ...

USFlash

US must up its game or risk being surpassed in supercomputing race by China, Japan & EU, new ITIF report finds ...

A compact, efficient single photon source that operates at ambient temperatures on a chip

4 May 2016 Jerusalem - Quantum information science and technology has emerged as a new paradigm for dramatically faster computation and secure communication in the 21st century. At the heart of any quantum system is the most basic building block, the quantum bit or qbit, which carries the quantum information that can be transferred and processed - this is the quantum analogue of the bit used in current information systems. The most promising carrier qbit for ultimately fast, long distance quantum information transfer is the photon, the quantum unit of light.

The challenge facing scientists is to produce artificial sources of photons for various quantum information tasks. One of the biggest challenges is the development of efficient, scalable photon sources that can be mounted on a chip and operate at room temperature. Most sources used in labs today have to be very cold (at the temperature of liquid Helium, about -270C), which requires large and expensive refrigerators. Many sources also emit photons in undefined directions, making efficient collection a hard problem.

Now, a team of scientists from the Hebrew University of Jerusalem has demonstrated an efficient and compact single photon source that can operate on a chip at ambient temperatures. Using tiny nanocrystals made of semiconducting materials, the scientists developed a method in which a single nanocrystal can be accurately positioned on top of a specially designed and carefully fabricated nano-antenna.

In the same way large antennas on rooftops direct emission of classical radio waves for cellular and satellite transmissions, the nano-antenna efficiently directed the single photons emitted from the nanocrystals into a well-defined direction in space. This combined nanocrystals-nanoantenna device was able to produce a highly directional stream of single photons all flying to the same direction with a record low divergence angle. These photons were then collected with a very simple optical set-up, and sent to be detected and analyzed using single photon detectors.

The team demonstrated that this hybrid device enhances the collection efficiency of single photons by more than a factor of 10 compared to a single nanocrystal without the antenna, without the need for complex and bulky optical collection systems used in many other experiments. Experimental results show that almost 40% of the photons are easily collected with a very simple optical apparatus, and over 20% of the photons are emitted into a very low numerical aperture, a 20-fold improvement over a freestanding quantum dot, and with a probability of more than 70% for a single photon emission. The single photon purity is limited only by emission from the metal, an obstacle that can be bypassed with careful design and fabrication.

The antennas were fabricated using simple metallic and dielectric layers using methods that are compatible with current industrial fabrication technologies, and many such devices can be fabricated densely on one small chip. The team is now working on a new generation of improved devices that will allow deterministic production of single photons straight from the chip into optical fibers, without any additional optical components, with a near unity efficiency.

"This research paves a promising route for a high purity, high efficiency, on-chip single photon source operating at room temperature, a concept that can be extended to many types of quantum emitters. A highly directional single photon source could lead to a significant progress in producing compact, cheap, and efficient sources of quantum information bits for future quantum technological applications", stated Prof. Ronen Rapaport, of the Racah Institute of Physics, the Department of Applied Physics, and the Center of Nanoscience and Nanotechnology at the Hebrew University of Jerusalem.
Source: The Hebrew University of Jerusalem

Back to Table of contents

Primeur weekly 2016-05-17

Quantum computing

New design of primitive quantum computer finds application ...

Scientists take a major leap toward a perfect quantum metamaterial ...

A compact, efficient single photon source that operates at ambient temperatures on a chip ...

D-Wave Systems and 1QBit partner with financial industry experts to launch Quantum for Quants online community ...

Focus on Europe

Spring 2016 edition of the e-IRG newsletter available ...

Up to 150,000 euro up for grabs per European SME to fund CPS experiments ...

Alder Hey Children's Hospital set to become UK's first cognitive hospital ...

Leibniz Supercomputing Centre to host Workshop on HPC for Water Related Hazards ...

Registration still open for 9th International Workshop on Parallel Matrix Algorithms and Applications ...

Ron Perrott, an international leader in high performance computing receives ACM Distinguished Service Award ...

Middleware

Allinea tools to unleash research potential for Flemish supercomputer users ...

NSF grant to enable research computing infrastructure dedicated to science and engineering ...

Hardware

Leading thinkers convene in UK to tackle supercomputer efficiency barriers ...

Fujitsu receives order for 25 Petaflop/s supercomputer from the University of Tokyo and the University of Tsukuba ...

Call for Papers for PGAS Applications Workshop ...

IBM scientists achieve storage memory breakthrough ...

Applications

The Sun's magnetic field during the grand minimum is in fact at its maximum ...

IBM and UMBC collaborate to advance cognitive cybersecurity ...

Ten PhD students from across the USA selected as Blue Waters Graduate Fellows ...

Tiny terrors: Researcher works to uncover how bacteria develop antibiotic resistance through efflux pumps ...

Exxact Corporation extends its deep learning solutions with NVIDIA DGX-1 deep learning system ...

Engine design takes a major leap at Argonne ...

The Cloud

IBM Watson to tackle cybercrime ...

EuroFlash

TGAC installs largest SGI UV 300 supercomputer for Life Sciences worldwide to solve the most demanding data intensive problems ...

USFlash

US must up its game or risk being surpassed in supercomputing race by China, Japan & EU, new ITIF report finds ...