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Primeur weekly 2019-01-07

Focus

What has EuroHPC in store for 2019? ...

Crowd computing

Nerdalize to announce bankruptcy ...

Quantum computing

Fujitsu launches next generation Quantum-Inspired Digital Annealer Service ...

Accenture awarded US patent for combining classical and quantum computing with potential to address previously unsolvable business problems ...

Quantum chemistry on quantum computers ...

Hybrid qubits solve key hurdle to quantum computing ...

Quantum Maxwell's demon 'teleports' entropy out of a qubit ...

Focus on Europe

Atos unveils modern and energy-efficient data centre with Yvelines departmental Council, positioning region as global technical hub ...

Forschungszentrum Jülich gets 36 million euro from German federal and state governments for computers of the future ...

Hardware

Mellanox Technologies names Doug Ahrens as Chief Financial Officer ...

SDSC's Trestles supercomputer still going strong more than three years later ...

Solarflare leads the way in making flash drive networking simple and scalable ...

Applications

Engine of cosmic evolution: Eve Ostriker looks under the hood ...

Atos reveals the 15 shortlisted teams of the 2019 Atos IT Challenge dedicated to Artificial Intelligence for Sustainability ...

Physicists record 'lifetime' of graphene qubits ...

Researchers monitor electron behaviour during chemical reactions for the first time ...

UK aid will be even quicker and smarter in 2019 ...

Four new eScience collaborations to start in 2019 ...

Research Data Netherlands to announce winners Dutch Data Prize 2018 ...

ASC Student Supercomputer Challenge provides a platform for international youth science and technology exchange ...

The Cloud

WekaIO achieves Amazon Web Services Storage Competency status for Primary Storage ...

Supermicro establishes new facility to optimize Cloud solutions with Intel in Europe ...

Supermicro report highlights environmental impact of today's Cloud-scale data centres ...

Hybrid qubits solve key hurdle to quantum computing

27 Dec 2018 Tokyo - Spin-based quantum computers have the potential to tackle difficult mathematical problems that cannot be solved using ordinary computers, but many problems remain in making these machines scalable. Now, an international group of researchers led by the RIKEN Center for Emergent Matter Science have crafted a new architecture for quantum computing. By constructing a hybrid device made from two different types of qubit - the fundamental computing element of quantum computers - they have created a device that can be quickly initialized and read out, and that simultaneously maintains high control fidelity.

In an era where conventional computers appear to be reaching a limit, quantum computers - which do calculations using quantum phenomena - have been touted as potential replacements, and they can tackle problems in a very different and potentially much more rapid way. However, it has proven difficult to scale them up to the size required for performing real-world calculations.

In 1998, Daniel Loss, one of the authors of the current study, came up with a proposal, along with David DiVincenzo of IBM, to build a quantum computer by using the spins of electrons embedded in a quantum dot - a small particle that behaves like an atom, but that can be manipulated, so that they are sometimes called "artificial atoms". In the time since then, Loss and his team have endeavoured to build practical devices.

There are a number of barriers to developing practical devices in terms of speed. First, the device must be able to be initialized quickly. Initialization is the process of putting a qubit into a certain state, and if that cannot be done rapidly it slows down the device. Second, it must maintain coherence for a time long enough to make a measurement. Coherence refers to the entanglement between two quantum states, and ultimately this is used to make the measurement, so if qubits become decoherent due to environmental noise, for example, the device becomes worthless. And finally, the ultimate state of the qubit must be able to be quickly read out.

While a number of methods have been proposed for building a quantum computer, the one proposed by Daniel Loss and David DiVincenzo remains one of the most practically feasible, as it is based on semiconductors, for which a large industry already exists.

For the current study, published in Nature Communications , the team combined two types of qubits on a single device. The first, a type of single-spin qubit called a Loss-DiVincenzo qubit, has very high control fidelity - meaning that it is in a clear state, making it ideal for calculations, and has a long decoherence time, so that it will stay in a given state for a relatively long time before losing its signal to the environment. Unfortunately, the downside to these qubits is that they cannot be quickly initialized into a state or read out. The second type, called a singlet-triplet qubit, is quickly initialized and read out, but it quickly becomes decoherent. For the study, the scientists combined the two types with a type of quantum gate known as a controlled phase gate, which allowed spin states to be entangled between the qubits in a time fast enough to maintain the coherence, allowing the state of the single-spin qubit to be read out by the fast singlet-triplet qubit measurement.

According to Akito Noiri of CEMS, the lead author of the study, "With this study we have demonstrated that different types of quantum dots can be combined on a single device to overcome their respective limitations. This offers important insights that can contribute to the scalability of quantum computers."

Source: RIKEN

Back to Table of contents

Primeur weekly 2019-01-07

Focus

What has EuroHPC in store for 2019? ...

Crowd computing

Nerdalize to announce bankruptcy ...

Quantum computing

Fujitsu launches next generation Quantum-Inspired Digital Annealer Service ...

Accenture awarded US patent for combining classical and quantum computing with potential to address previously unsolvable business problems ...

Quantum chemistry on quantum computers ...

Hybrid qubits solve key hurdle to quantum computing ...

Quantum Maxwell's demon 'teleports' entropy out of a qubit ...

Focus on Europe

Atos unveils modern and energy-efficient data centre with Yvelines departmental Council, positioning region as global technical hub ...

Forschungszentrum Jülich gets 36 million euro from German federal and state governments for computers of the future ...

Hardware

Mellanox Technologies names Doug Ahrens as Chief Financial Officer ...

SDSC's Trestles supercomputer still going strong more than three years later ...

Solarflare leads the way in making flash drive networking simple and scalable ...

Applications

Engine of cosmic evolution: Eve Ostriker looks under the hood ...

Atos reveals the 15 shortlisted teams of the 2019 Atos IT Challenge dedicated to Artificial Intelligence for Sustainability ...

Physicists record 'lifetime' of graphene qubits ...

Researchers monitor electron behaviour during chemical reactions for the first time ...

UK aid will be even quicker and smarter in 2019 ...

Four new eScience collaborations to start in 2019 ...

Research Data Netherlands to announce winners Dutch Data Prize 2018 ...

ASC Student Supercomputer Challenge provides a platform for international youth science and technology exchange ...

The Cloud

WekaIO achieves Amazon Web Services Storage Competency status for Primary Storage ...

Supermicro establishes new facility to optimize Cloud solutions with Intel in Europe ...

Supermicro report highlights environmental impact of today's Cloud-scale data centres ...