Europe’s Quantum Flagship initiative

Riedel, Max F.; Kovacs, Matyas; Zoller, P.; Mlynek, J.; Calarco, Tommaso

doi:10.1088/2058-9565/ab042d

Cited by 68 publications

(59 citation statements)

References 1 publication

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“…[ 3–6 ] Increasing from a few tens of qubits to beyond thousands of qubits would require rather radical rethinking of the overall architecture, material and process compatibility, and operational strategy. The tour de force to build a quantum computer typically involve significant investments at the national level (e.g., Australia, Canada, US, EU, UK), [ 7–12 ] or by industry juggernauts, [ 13 ] since the entire technology stack needed to drive a quantum computer is quite specific to the particular type of qubit used. To this end, a solid‐state qubit platform that could be compatible with the existing Si microelectronics is often seen as beneficial and economical since the classical electronics portion is already a well‐established technology with ready foundries.…”

Section: Introductionmentioning

confidence: 99%

Toward Valley‐Coupled Spin Qubits

et al. 2020

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The bid for scalable physical qubits has attracted many possible candidate platforms. In particular, spin‐based qubits in solid‐state form factors are attractive as they could potentially benefit from processes similar to those used for conventional semiconductor processing. However, material control is a significant challenge for solid‐state spin qubits as residual spins from substrate, dielectric, electrodes, or contaminants from processing contribute to spin decoherence. In the recent decade, valleytronics has seen a revival due to the discovery of valley‐coupled spins in monolayer transition metal dichalcogenides. Such valley‐coupled spins are protected by inversion asymmetry and time reversal symmetry and are promising candidates for robust qubits. In this report, the progress toward building such qubits is presented. Following an introduction to the key attractions in fabricating such qubits, an up‐to‐date brief is provided for the status of each key step, highlighting advancements made and/or outstanding work to be done. This report concludes with a perspective on future development highlighting major remaining milestones toward scalable spin‐valley qubits.

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Section: Introductionmentioning

confidence: 99%

Toward Valley‐Coupled Spin Qubits

et al. 2020

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“…In general, superconducting junction coolers can provide a compact and highly attractive alternative for cryo-liquid-based cooling stages, and these refrigerators would revolutionize technology fields relying on low-temperature devices. A topical example is the emerging field of quantum technologies (26), where the cooling of electronics, sensors, and/or quantum computation/simulation cores is often the basic functional requirement. Control schemes for quantum bits (qubits) can use, e.g., classical dissipative cryo-CMOS (complementary metal-oxide semiconductor), which is at a higher temperature stage above 1 K with respect to the sub-1 K qubits (27).…”

Section: Introductionmentioning

confidence: 99%

Thermionic junction devices utilizing phonon blocking

et al. 2020

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Electrothermal elements are used in various energy harvesters, coolers, and radiation detectors. The optimal operation of these elements relies on mastering two competing boundary conditions: the maximization of the electrothermal response and the blockade of lattice (phonon) thermal conduction. In this work, we propose and demonstrate that efficient electrothermal operation and phonon blocking can be achieved in solid-state thermionic junctions, paving the way for new phonon-engineered high-efficiency refrigerators and sensors. Our experimental demonstration uses semiconductor-superconductor (Sm-S) junctions where the electrothermal response arises from the superconducting energy gap and the phonon blocking results from the acoustic transmission bottleneck at the junction. We demonstrate a cooling platform where a silicon chip, suspended only from the Sm-S junctions, is cooled by ~40% from the bath temperature. We also show how the observed effect can be used in radiation detectors and multistage electronic refrigerators suitable for cooling of quantum technology devices.

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“…Interest in quantum cryptography in the EU has been accompanied by projects funded under the Quantum Technologies Flagship, QuantEra, COST, and EuraMet programs [107][108][109][110][111][112]. In 2019, the EU Horizont2020 project OPENQKD with a consortium of 38 partners from industry and academia was announced [113].…”

Section: Discussionmentioning

confidence: 99%

Quantum Key Distribution

et al. 2020

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The convergence of quantum cryptography with applications used in everyday life is a topic drawing attention from the industrial and academic worlds. The development of quantum electronics has led to the practical achievement of quantum devices that are already available on the market and waiting for their first The research leading to the published results was supported by the project SGS reg. no.

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Europe’s Quantum Flagship initiative

Cited by 68 publications

References 1 publication

Toward Valley‐Coupled Spin Qubits

Toward Valley‐Coupled Spin Qubits

Thermionic junction devices utilizing phonon blocking

Quantum Key Distribution

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