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Primeur weekly 2017-03-20

Focus

CEO Steve Cotter elaborates on GEANT's backbone infrastructure, service deployment and KPI development ...

Exascale supercomputing

MicroVisor, a new hypervisor technology, paves the way for low-power data centres ...

Crowd computing

iEx.ec announces token crowdsale to launch the first distributed Cloud Crowdcomputing platform ...

Quantum computing

Digital pioneering work: Volkswagen uses quantum computers ...

D-Wave and Virginia Tech join forces to advance quantum computing ...

D-Wave 2000Q system to be installed at Quantum Artificial Intelligence Lab run by Google, NASA, and Universities Space Research Association ...

Focus on Europe

NVIDIA partners with Bosch for system based on next-generation DRIVE PX Xavier platform ...

New supercomputer for RWTH Aachen ...

European 'Big Data' e-infrastructure to support biodiversity research Lifewatch now ERIC legal entity ...

ISC 2017 dedicates a day to deep learning ...

Hardware

Los Alamos National Laboratory donation adding to University of New Mexico supercomputing power ...

BASF selects HPE to build supercomputer for global chemical research ...

Top weather and climate sites rely on DDN storage for more accurate, faster simulations, forecasts and predictions ...

Noodle.ai unveils BEAST Enterprise Artificial Intelligence supercomputing technology - powered by NVIDIA DGX-1 AI supercomputer ...

Simons Foundation's Flatiron Institute to repurpose SDSC's 'Gordon' supercomputer ...

Applications

A scientist and a supercomputer re-create a tornado ...

Arthritis Research UK introduces IBM Watson-powered 'virtual assistant' to provide information and advice to people with arthritis ...

High-precision calculations on supercomputers help reveal the physics of the universe ...

IDx and IBM Watson Health forge alliance for eye health ...

IBM Watson Health to integrate MedyMatch Technology into cognitive imaging offerings to help doctors identify head trauma and stroke ...

Simultaneous detection of multiple spin states in a single quantum dot ...

Computer simulation of protein synthesis reveals awesome complexity of cell machinery ...

Computer simulations first step toward designing more efficient amine chemical scrubbers ...

The prototype of a chemical computer detects a sphere ...

The Cloud

Oracle announces fiscal 2017 Q3 results ...

IBM and Red Hat Collaborate to Accelerate Hybrid Cloud Adoption with OpenStack ...

Simultaneous detection of multiple spin states in a single quantum dot

This is a comparison between binary spin readout and ternary spin readout. Credit: Osaka University.13 Mar 2017 Osaka - Quantum dots are very small particles that exhibit luminescence and electronic properties different from those of their bulk materials. As a result, they are attractive for use in solar cells, opto-electronics, and quantum computing. Quantum computing involves applying a small voltage to quantum dots to regulate their electron spin state, thus encoding information. While traditional computing is based on a binary information system, electron spin states in quantum dots can display further degrees of freedom because of the possibility of superposition of both states at the same time. This feature could increase the density of encoded information.

Readout of the electron spin of quantum dots is necessary to realize quantum computing. Single-shot spin readout has been used to detect spin-dependent single-electron tunneling events in real time. The performance of quantum computing could be improved considerably by single-shot readout of multiple spin states.

A Japanese research collaboration based at Osaka University has now achieved the first successful detection of multiple spin states through single-shot readout of three two-electron spin states of a single quantum dot. They reported their findings in Physical Review Letters .

To read out multiple spin states simultaneously, the researchers used a quantum point contact charge sensor positioned near a gallium arsenide quantum dot. The change in current of the charge sensor depended on the spin state of the quantum dot and was used to distinguish between singlet and two types of triplet spin states.

"We obtained single-shot ternary readout of two-electron spin states using edge-state spin filtering and the orbital effect", study first author Haruki Kiyama stated.

That is, the rate of tunneling between the quantum dot and electron reservoir depended on both the spin state of the electrons and the interaction between electron spin and the orbitals of the quantum dot. The team identified one ground state and two excited states in the quantum dot using their set-up.

The researchers then used their ternary readout set-up to investigate the spin relaxation behaviour of the three detected spin states.

"To confirm the validity of our readout system, we measured the spin relaxation of two of the states", Haruki Kiyama explained. "Measurement of the dynamics between the spin states in a quantum dot is an important application of the ternary spin readout set-up."

The spin relaxation times for the quantum dot measured using the ternary readout system agreed with those reported, providing evidence that the system yielded reliable measurements.

This ternary readout system can be extended to quantum dots composed of other materials, revealing a new approach to examine the spin dynamics of quantum dots and representing an advance in quantum information processing.

Source: Osaka University

Back to Table of contents

Primeur weekly 2017-03-20

Focus

CEO Steve Cotter elaborates on GEANT's backbone infrastructure, service deployment and KPI development ...

Exascale supercomputing

MicroVisor, a new hypervisor technology, paves the way for low-power data centres ...

Crowd computing

iEx.ec announces token crowdsale to launch the first distributed Cloud Crowdcomputing platform ...

Quantum computing

Digital pioneering work: Volkswagen uses quantum computers ...

D-Wave and Virginia Tech join forces to advance quantum computing ...

D-Wave 2000Q system to be installed at Quantum Artificial Intelligence Lab run by Google, NASA, and Universities Space Research Association ...

Focus on Europe

NVIDIA partners with Bosch for system based on next-generation DRIVE PX Xavier platform ...

New supercomputer for RWTH Aachen ...

European 'Big Data' e-infrastructure to support biodiversity research Lifewatch now ERIC legal entity ...

ISC 2017 dedicates a day to deep learning ...

Hardware

Los Alamos National Laboratory donation adding to University of New Mexico supercomputing power ...

BASF selects HPE to build supercomputer for global chemical research ...

Top weather and climate sites rely on DDN storage for more accurate, faster simulations, forecasts and predictions ...

Noodle.ai unveils BEAST Enterprise Artificial Intelligence supercomputing technology - powered by NVIDIA DGX-1 AI supercomputer ...

Simons Foundation's Flatiron Institute to repurpose SDSC's 'Gordon' supercomputer ...

Applications

A scientist and a supercomputer re-create a tornado ...

Arthritis Research UK introduces IBM Watson-powered 'virtual assistant' to provide information and advice to people with arthritis ...

High-precision calculations on supercomputers help reveal the physics of the universe ...

IDx and IBM Watson Health forge alliance for eye health ...

IBM Watson Health to integrate MedyMatch Technology into cognitive imaging offerings to help doctors identify head trauma and stroke ...

Simultaneous detection of multiple spin states in a single quantum dot ...

Computer simulation of protein synthesis reveals awesome complexity of cell machinery ...

Computer simulations first step toward designing more efficient amine chemical scrubbers ...

The prototype of a chemical computer detects a sphere ...

The Cloud

Oracle announces fiscal 2017 Q3 results ...

IBM and Red Hat Collaborate to Accelerate Hybrid Cloud Adoption with OpenStack ...