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Primeur weekly 2018-03-05

Quantum computing

Want more efficient simulators? Store time in a quantum superposition ...

Experimentally demonstrated a toffoli gate in a semiconductor three-qubit system ...

Individual quantum dots imaged in 3D for first time ...

Artificial intelligence techniques reconstruct mysteries of quantum systems ...

Majorana runners go long range: New topological phases of matter unveiled ...

Focus on Europe

University of Groningen to organize Second Information Universe Conference ...

IEEE eScience 2018 calls for contributions ...

Harvey Meyer is awarded an ERC Consolidator Grant for fundamental calculations on strong interaction effects ...

BSC presents SuperGeek, a mascot to bring supercomputers closer to the youngest ...

Call for Participation to European Forum about "Shaping Europe's Digital Future - HPC for Extreme Scale Scientific and Industrial Applications" ...

Data management and computing infrastructure procurement broadly serves Finnish research ...

Hardware

High demand from commercial customers to boost growth in global supercomputer market ...

OCF deploys UK academia's first IBM POWER9 systems ...

Niagara is Canada's most powerful research supercomputer fuelling Canadian innovation and discovery ...

CENIC recognizes UCSC's Hyades supercomputer cluster connection ...

CoolIT Systems reports 60% revenue growth in 2017 ...

SPEC offers HPG benchmarks free of charge to qualified non-profit organisations worldwide ...

Applications

Supercomputer model reveals how sticky tape makes graphene ...

Concertio launches Optimizer Studio to help performance engineers and IT professionals achieve peak system performance ...

Sandia researcher Jacqueline Chen elected to National Academy of Engineering ...

Oak Ridge National Laboratory uses supercomputers to simulate radiation transport and to understand the dynamic interactions among ions, solids and liquids ...

Mining hardware helps scientists gain insight into silicon nanoparticles ...

Can strongly lensed type 1a supernovae resolve cosmology's biggest controversy? ...

Give your research a boost at the SURF Research Bootcamp ...

TOP500

Supercomputing under a new lens: A Sandia-developed benchmark re-ranks top computers ...

The Cloud

Alibaba Cloud launches Cloud and AI solutions in Europe including bare metal HPC services ...

KIT helps build the European Open Science Cloud ...

Experimentally demonstrated a toffoli gate in a semiconductor three-qubit system


This is the Toffoli Gate in a three-qubit system. Credit: University of Science and Technology of China.
27 Feb 2018 Hefei - A new progress in the scaling of semiconductor quantum dot based qubit has been achieved at the Key Laboratory of Quantum Information and Synergetic Innovation Center of Quantum Information & Quantum Physics of the University of Science and Technology China (USTC). Professor Guo Guoping with his co-workers, Xiao Ming, Li Haiou and Cao Gang, designed and fabricated a quantum processor with six quantum dots, and experimentally demonstrated quantum control of the Toffoli gate. This is the first time for the realization of the Toffoli gate in the semiconductor quantum dot system, which motivates further research on larger scale semiconductor quantum processor.

The result was published as " Controlled Quantum Operations of a Semiconductor Three-Qubit System " inPhysical Review Applied9, 024015 (2018).

Developing the scalable semiconductor quantum chip that is compatible with modern semiconductor techniques is an important research area. In this area, the fabrication, manipulation and scaling of semiconductor quantum dot based qubits are the most important core technologies. Professor Guo Guoping's group aims to master these technologies and has been devoted to this area for a long time. Before the demonstration of the three-qubit gate, they have realized ultrafast universal control of the charge qubit based on semiconductor quantum dots in 2013 (Nature Communications, 4:1401 (2013)), and achieved the controlled rotation of two charge qubits in 2015 (Nature Communications, 6:7681 (2015)).

The Toffoli gate is a three-qubit operation that changed the state of a target qubit conditioned on the state of two control qubits. It can be used for universal reversible classical computation and also forms a universal set of qubit gates in quantum computation together with a Hadamard gate. Furthermore, it is a key element in quantum error correction schemes. Implementation of the Toffoli gate with only single- and two-qubit operations requires six controlled-NOT gates and ten single-qubit operations.

As a result, a single-step Toffoli gate can reduce the number of quantum operations dramatically, which can break the limit of coherence time and improve the efficiency of quantum computing. Researchers from Guo Guoping's group found the T-shaped six quantum dot architecture with openings between control qubits and the target qubit can strengthen the coupling between qubits with different function and minimize it between qubits with the same function, which satisfies the requirements of the Toffoli gate well. Using this architecture with optimized high frequency pulses, researchers demonstrated the Toffoli gate in semiconductor quantum dot system in the world for the first time, which paves the way and lays a solid foundation for the scalable semiconductor quantum processor.

The reviewer spoke highly of this work, and thought this is an important progress in the field of semiconductor quantum dot based quantum computing. "The work is detailed and clearly demonstrates a high level of experimental technique and would be of high interest to people working in the field of electrostatically defined quantum dots for quantum computation."

Source: University of Science and Technology of China

Back to Table of contents

Primeur weekly 2018-03-05

Quantum computing

Want more efficient simulators? Store time in a quantum superposition ...

Experimentally demonstrated a toffoli gate in a semiconductor three-qubit system ...

Individual quantum dots imaged in 3D for first time ...

Artificial intelligence techniques reconstruct mysteries of quantum systems ...

Majorana runners go long range: New topological phases of matter unveiled ...

Focus on Europe

University of Groningen to organize Second Information Universe Conference ...

IEEE eScience 2018 calls for contributions ...

Harvey Meyer is awarded an ERC Consolidator Grant for fundamental calculations on strong interaction effects ...

BSC presents SuperGeek, a mascot to bring supercomputers closer to the youngest ...

Call for Participation to European Forum about "Shaping Europe's Digital Future - HPC for Extreme Scale Scientific and Industrial Applications" ...

Data management and computing infrastructure procurement broadly serves Finnish research ...

Hardware

High demand from commercial customers to boost growth in global supercomputer market ...

OCF deploys UK academia's first IBM POWER9 systems ...

Niagara is Canada's most powerful research supercomputer fuelling Canadian innovation and discovery ...

CENIC recognizes UCSC's Hyades supercomputer cluster connection ...

CoolIT Systems reports 60% revenue growth in 2017 ...

SPEC offers HPG benchmarks free of charge to qualified non-profit organisations worldwide ...

Applications

Supercomputer model reveals how sticky tape makes graphene ...

Concertio launches Optimizer Studio to help performance engineers and IT professionals achieve peak system performance ...

Sandia researcher Jacqueline Chen elected to National Academy of Engineering ...

Oak Ridge National Laboratory uses supercomputers to simulate radiation transport and to understand the dynamic interactions among ions, solids and liquids ...

Mining hardware helps scientists gain insight into silicon nanoparticles ...

Can strongly lensed type 1a supernovae resolve cosmology's biggest controversy? ...

Give your research a boost at the SURF Research Bootcamp ...

TOP500

Supercomputing under a new lens: A Sandia-developed benchmark re-ranks top computers ...

The Cloud

Alibaba Cloud launches Cloud and AI solutions in Europe including bare metal HPC services ...

KIT helps build the European Open Science Cloud ...