Projects & Collaborations 30 foundShow per page10 10 20 50 Scalable High Bandwidth Quantum Network (sQnet) Research Project | 2 Project MembersRealizing a scalable quantum network is one of the grand challenges of quantum technology, with numerous potential applications in secure communication, quantum sensor networks, and distributed quantum computation. Single-photon sources and compatible quantum memories are key ingredients of quantum networks and the requirements on their performance are very stringent. In this project we will establish a scalable quantum networking platform that combines several high-performance elements: semiconductor quantum dot single-photon sources and compatible atomic vapor cell quantum memories implemented in scalable MEMS technology, operating with GHz bandwidth at convenient near-infrared wavelengths. Connectivity over long distance and to other platforms is enabled by efficient conversion of single photons to telecom wavelength using on-chip nonlinear optics. Combining these building blocks, we will demonstrate quantum networking tasks such as remote entanglement generation between quantum memories over a telecom fiber link. By demonstrating the basic functionality of a scalable quantum networking platform that operates at high efficiency and bandwidth, the project will lay the ground for the implementation of more advanced quantum networking protocols and scaling to multiple nodes. Ultra high precision electron beam lithography system for nanodevice and nanostructures definition Research Project | 6 Project MembersIn the last decades nano- and quantum-science have been steadily growing in large part also thanks to the availability of ever more advanced processing, manipulation, and imaging tech-niques. Specifically, nanofabrication has been the leading enabler of experiments and devices, in which quantum mechanics play a key role. The University of Basel is nationally and internationally recognized as a leader innanoscience and nanotechnology. It was the leading house of the National Center in Competence and Re-search (NCCR) on Nanoscience, which later became the Swiss Nanoscience Institute (SNI). The University of Basel is leading the NCCR SPIN for the realization of spin qubits in Silicon and is also co-leading the NCCR QSIT on Quantum Science and Technology (with ETHZ as Leading House). The present proposal to the SNF R'Equip scheme is a joint effort of six principal investigators (PIs) in the physics department of the University of Basel, who work on current topics in quantum- and nano-science. The PIs, who submit this proposal together, do research that relies on the availability of state-of-the-art fabrication tools, such as an electron beam lithography (EBL) system. The proposal makes the case for the purchase of an ultra-high precision EBL system that combines high resolution, tunable acceleration voltages, different write-field size, ultra-high precision alignment, proximity correction, and mechanical stability. This combination is unique and crucial for the University of Basel to stay at the forefront of nano-science and technology. The system will be installed in the new clean room shared between the University of Basel and the Department of Biosystem Science and Engineering of the ETH. Therefore, the purchased system will be available for the users of the clean-room. Hi-FrED / High-Frequency Spin Entanglement Generation in Diamond Research Project | 2 Project MembersHigh-Frequency Spin Entanglement Generation in Diamond (Hi-FrED) Nano-photonics with van der Waals heterostructures Research Project | 3 Project MembersWe propose to create van der Waals heterostructures for nano-photonics applications, notably as congurable single photon sources. The project involves nano-materials development (pristine heterostructures and quantum dots) and nano-photonics experiments (single emitter characterization). Georg H. Endress Postdoctoral Fellow Dr. Andreas Kuhlmann Research Project | 2 Project MembersThe project aims to develop elements for scalable quantum computation with CMOS qubits G. H. Endress Postdoc-Cluster Research Project | 5 Project MembersDas Departement für Physik der Philosophisch-Naturwissenschaftlichen Fakultät der Universität Basel und das Physikalische Institut der Fakultät für Mathematik und Physik der Albert Ludwigs-Universität Freiburg im Breisgau errichten partnerschaftlich ein neues Exzellenzzentrum mit den Forschungsschwerpunkten "Quantum Science and Quantum Computing" unter dem Dach von Eucor - The European Campus . Als tragende Säule dieses Exzellenzzentrums wird ein grenzüberschreitender Postdoc-Cluster zwischen den Universitäten Basel und Freiburg aufgebaut. Primäre Ziele des zukünftigen Postdoc-Clusters sind die hochwertige Ausbildung der Postdocs für den akademischen als auch wirtschaftlichen Arbeitsmarkt und die Positionierung als führende Forschungseinrichtung auf dem Gebiet "Quantum Science and Quantum Computing", im Speziellen durch die verstärkte grenzüberschreitende Zusammenarbeit im Dreiländereck Deutschland-Frankreich-Schweiz. Das Exzellenzzentrum "Quantum Science and Quantum Computing" wird von der Georg H. Endress Stiftung finanziell unterstützt. Electro-optics of semiconductor nanostructures III Research Project | 5 Project MembersQuantum communication and quantum computation offer compelling advantages over their classical counterparts. Quantum communication over short distances is a reality; over long distances it is not. A fully-fledged quantum computer remains a very distant prospect but its potential to solve hard problems in chemistry and materials science make it an extremely important goal. Application of these quantum concepts with semiconductors offers a route to creating small, fast and scalable devices. However, while the materials have powerful advantages they are also complex with several inter-connected sub-systems (electronic charge, electronic spin, nuclear spins, phonons, photons). The physics of these materials, particularly with structure on the nano-scale, needs to be understood. The overriding goal of this project is to make leading contributions to the development of semiconductor-based quantum technology. There are three inter-linked strands, development of a quantum device, an investigation into some of the key physics, and an exploration of new materials.Tunable quantum dots in a tunable micro-cavityA self-assembled quantum dot has emerged as a leading contender for a source of single photons. The photons should be bright, pure and indistinguishable. Quantum dots far beneath the surface of the semiconductor emit pure and highly indistinguishable photons but the brightness is poor on account of the difficulties of extracting photons from the high-index semiconductor. High-brightness devices rely on nano-fabrication. In many cases, the nano-fabrication is both complex and invasive such that device yield is poor, and the photon purity and indistinguishable suffer. The proposal here is to solve this conundrum by embedding electrically-contacted quantum dots in a vertical micro-cavity: tunable quantum dots in a tunable micro-cavity. Nano-fabrication is bypassed: the quantum dots in the device are guaranteed to have ultra-high quality; contacting the device is trivial. The mirrors are built with known, ultra-high quality materials and techniques. Calculations show that two ideal limits can be reached, optimized photon collection and strong coupling. Remarkably, only a modest micro-cavity finesse (~1,000) is required for ultra-high photon extraction. These ideas will be implemented paying attention to all the crucial details which have hindered progress in the past. The technology will be simplified in order to create a device. An efficient spin-photon interface will be built by trapping a single spin (either electron or hole) in the quantum dot. Spin-photon entanglement protocols will be applied, and, on success, entanglement swapping operations to create high-rate spin-spin entanglements.Phononics with an embedded quantum dotThe electron-phonon interaction results in spin dephasing in a semiconductor. This is not inevitable. The phonon modes and their occupations can be controlled, a process of "phononics". Compared to "photonics", phononics has received almost no attention in the context of quantum dots. A phononic crystal will be created with a gap in the density of states in the few-GHz regime. When the electron spin Zeeman frequency lies in this gap, phonon-related spin relaxation should be suppressed. Conversely, the spin relaxation rate will be used to probe the local phonon density of states. A localized high-Q phonon mode will be created by using a phononic crystal to shield a small element from the bulk phonon modes. An embedded quantum dot will couple to the localized phonon mode. The aim is to reach the resolved sideband regime which allows the phonon number to be controlled, possibly to the phonon ground state, by optically driving the quantum dot.Quantum photonics with 2D semiconductorsThe only known way of "wiring up" self-assembled quantum dots is via photons. A "circuit" of self-assembled quantum dots does not exist largely because the quantum dots must be located deep below the surface. A tantalizing prospect is to create a quantum dot circuit with a two-dimensional semiconductor where, by its very nature, all the action takes place on or very close to the surface. Only the most rudimentary quantum dot-like elements exist in this materials class, for instance confined excitons in WSe2. The aim here is to create quantum dots in pre-defined locations with an electrical technique. Marie Curie Individual Fellowship: EPPIC Research Project | 2 Project MembersEmitter-mediated Photon-Phonon InteraCtion (EPPIC) 4Photon Research Project | 1 Project MembersThis four year network (starting in January 2017) brings together an exceptionally strong team of world-leading experts in nano-science and technology from 6 European countries in order to achieve breakthroughs in understanding and successful utilization of photonic based nano-systems in emerging quantum technologies. The consortium of 8 academic and 3 industrial groups will deliver top international level multidisciplinary training to 15 early stage researchers, offering them an extended program of multinational exchanges and secondments. The training will be provided by world class research and industry institutions from Italy, UK, Germany, France, Switzerland, Netherlands. Full members of the network are the University of Milano Bicocca, Universities of Sheffield and University College of London, Technical University of Eindhoven, University of Wurzburg, National Centre for Scientific Research, University of Hamburg and Universities of Basel together with the industrial beneficiaries Toshiba Research Europe Ltd, Single Quantum and attocube systems AG. The associated partners are Ioffe Institute (Russia), National Institute of Materials Science (Japan), University of Firenze (Italy), EPSRC III-V Semiconductor Technology Facility (UK), Université d'Aix-Marseille de Provence et de Toulon (France), Kunglig Tekniska Hogskola (Sweden) and Think Ahead (UK). Network-wide training course in transferable skills will be specially developed and delivered by the Think Ahead (Sheffield), an award winning programme supporting Early Career Researchers (award by the Times Higher Education, 2014). HiPerNanoWire: High-performance superconducting nanowire single-photon detectors Research Project | 2 Project MembersSuperconducting nanowire single-photon detectors (SNSPD) can achieve near-perfect detection efficiency over a broad spectral range. The goal of this project is to produce a complete solution for high-performance SNSPDs at a low fabrication cost. It will allow simple integration and alleviate the complexity of the cryogenics. Current users are mostly research labs, but are system will have the potential to reach widespread use in emerging commercial applications. 123 123
Scalable High Bandwidth Quantum Network (sQnet) Research Project | 2 Project MembersRealizing a scalable quantum network is one of the grand challenges of quantum technology, with numerous potential applications in secure communication, quantum sensor networks, and distributed quantum computation. Single-photon sources and compatible quantum memories are key ingredients of quantum networks and the requirements on their performance are very stringent. In this project we will establish a scalable quantum networking platform that combines several high-performance elements: semiconductor quantum dot single-photon sources and compatible atomic vapor cell quantum memories implemented in scalable MEMS technology, operating with GHz bandwidth at convenient near-infrared wavelengths. Connectivity over long distance and to other platforms is enabled by efficient conversion of single photons to telecom wavelength using on-chip nonlinear optics. Combining these building blocks, we will demonstrate quantum networking tasks such as remote entanglement generation between quantum memories over a telecom fiber link. By demonstrating the basic functionality of a scalable quantum networking platform that operates at high efficiency and bandwidth, the project will lay the ground for the implementation of more advanced quantum networking protocols and scaling to multiple nodes.
Ultra high precision electron beam lithography system for nanodevice and nanostructures definition Research Project | 6 Project MembersIn the last decades nano- and quantum-science have been steadily growing in large part also thanks to the availability of ever more advanced processing, manipulation, and imaging tech-niques. Specifically, nanofabrication has been the leading enabler of experiments and devices, in which quantum mechanics play a key role. The University of Basel is nationally and internationally recognized as a leader innanoscience and nanotechnology. It was the leading house of the National Center in Competence and Re-search (NCCR) on Nanoscience, which later became the Swiss Nanoscience Institute (SNI). The University of Basel is leading the NCCR SPIN for the realization of spin qubits in Silicon and is also co-leading the NCCR QSIT on Quantum Science and Technology (with ETHZ as Leading House). The present proposal to the SNF R'Equip scheme is a joint effort of six principal investigators (PIs) in the physics department of the University of Basel, who work on current topics in quantum- and nano-science. The PIs, who submit this proposal together, do research that relies on the availability of state-of-the-art fabrication tools, such as an electron beam lithography (EBL) system. The proposal makes the case for the purchase of an ultra-high precision EBL system that combines high resolution, tunable acceleration voltages, different write-field size, ultra-high precision alignment, proximity correction, and mechanical stability. This combination is unique and crucial for the University of Basel to stay at the forefront of nano-science and technology. The system will be installed in the new clean room shared between the University of Basel and the Department of Biosystem Science and Engineering of the ETH. Therefore, the purchased system will be available for the users of the clean-room.
Hi-FrED / High-Frequency Spin Entanglement Generation in Diamond Research Project | 2 Project MembersHigh-Frequency Spin Entanglement Generation in Diamond (Hi-FrED)
Nano-photonics with van der Waals heterostructures Research Project | 3 Project MembersWe propose to create van der Waals heterostructures for nano-photonics applications, notably as congurable single photon sources. The project involves nano-materials development (pristine heterostructures and quantum dots) and nano-photonics experiments (single emitter characterization).
Georg H. Endress Postdoctoral Fellow Dr. Andreas Kuhlmann Research Project | 2 Project MembersThe project aims to develop elements for scalable quantum computation with CMOS qubits
G. H. Endress Postdoc-Cluster Research Project | 5 Project MembersDas Departement für Physik der Philosophisch-Naturwissenschaftlichen Fakultät der Universität Basel und das Physikalische Institut der Fakultät für Mathematik und Physik der Albert Ludwigs-Universität Freiburg im Breisgau errichten partnerschaftlich ein neues Exzellenzzentrum mit den Forschungsschwerpunkten "Quantum Science and Quantum Computing" unter dem Dach von Eucor - The European Campus . Als tragende Säule dieses Exzellenzzentrums wird ein grenzüberschreitender Postdoc-Cluster zwischen den Universitäten Basel und Freiburg aufgebaut. Primäre Ziele des zukünftigen Postdoc-Clusters sind die hochwertige Ausbildung der Postdocs für den akademischen als auch wirtschaftlichen Arbeitsmarkt und die Positionierung als führende Forschungseinrichtung auf dem Gebiet "Quantum Science and Quantum Computing", im Speziellen durch die verstärkte grenzüberschreitende Zusammenarbeit im Dreiländereck Deutschland-Frankreich-Schweiz. Das Exzellenzzentrum "Quantum Science and Quantum Computing" wird von der Georg H. Endress Stiftung finanziell unterstützt.
Electro-optics of semiconductor nanostructures III Research Project | 5 Project MembersQuantum communication and quantum computation offer compelling advantages over their classical counterparts. Quantum communication over short distances is a reality; over long distances it is not. A fully-fledged quantum computer remains a very distant prospect but its potential to solve hard problems in chemistry and materials science make it an extremely important goal. Application of these quantum concepts with semiconductors offers a route to creating small, fast and scalable devices. However, while the materials have powerful advantages they are also complex with several inter-connected sub-systems (electronic charge, electronic spin, nuclear spins, phonons, photons). The physics of these materials, particularly with structure on the nano-scale, needs to be understood. The overriding goal of this project is to make leading contributions to the development of semiconductor-based quantum technology. There are three inter-linked strands, development of a quantum device, an investigation into some of the key physics, and an exploration of new materials.Tunable quantum dots in a tunable micro-cavityA self-assembled quantum dot has emerged as a leading contender for a source of single photons. The photons should be bright, pure and indistinguishable. Quantum dots far beneath the surface of the semiconductor emit pure and highly indistinguishable photons but the brightness is poor on account of the difficulties of extracting photons from the high-index semiconductor. High-brightness devices rely on nano-fabrication. In many cases, the nano-fabrication is both complex and invasive such that device yield is poor, and the photon purity and indistinguishable suffer. The proposal here is to solve this conundrum by embedding electrically-contacted quantum dots in a vertical micro-cavity: tunable quantum dots in a tunable micro-cavity. Nano-fabrication is bypassed: the quantum dots in the device are guaranteed to have ultra-high quality; contacting the device is trivial. The mirrors are built with known, ultra-high quality materials and techniques. Calculations show that two ideal limits can be reached, optimized photon collection and strong coupling. Remarkably, only a modest micro-cavity finesse (~1,000) is required for ultra-high photon extraction. These ideas will be implemented paying attention to all the crucial details which have hindered progress in the past. The technology will be simplified in order to create a device. An efficient spin-photon interface will be built by trapping a single spin (either electron or hole) in the quantum dot. Spin-photon entanglement protocols will be applied, and, on success, entanglement swapping operations to create high-rate spin-spin entanglements.Phononics with an embedded quantum dotThe electron-phonon interaction results in spin dephasing in a semiconductor. This is not inevitable. The phonon modes and their occupations can be controlled, a process of "phononics". Compared to "photonics", phononics has received almost no attention in the context of quantum dots. A phononic crystal will be created with a gap in the density of states in the few-GHz regime. When the electron spin Zeeman frequency lies in this gap, phonon-related spin relaxation should be suppressed. Conversely, the spin relaxation rate will be used to probe the local phonon density of states. A localized high-Q phonon mode will be created by using a phononic crystal to shield a small element from the bulk phonon modes. An embedded quantum dot will couple to the localized phonon mode. The aim is to reach the resolved sideband regime which allows the phonon number to be controlled, possibly to the phonon ground state, by optically driving the quantum dot.Quantum photonics with 2D semiconductorsThe only known way of "wiring up" self-assembled quantum dots is via photons. A "circuit" of self-assembled quantum dots does not exist largely because the quantum dots must be located deep below the surface. A tantalizing prospect is to create a quantum dot circuit with a two-dimensional semiconductor where, by its very nature, all the action takes place on or very close to the surface. Only the most rudimentary quantum dot-like elements exist in this materials class, for instance confined excitons in WSe2. The aim here is to create quantum dots in pre-defined locations with an electrical technique.
Marie Curie Individual Fellowship: EPPIC Research Project | 2 Project MembersEmitter-mediated Photon-Phonon InteraCtion (EPPIC)
4Photon Research Project | 1 Project MembersThis four year network (starting in January 2017) brings together an exceptionally strong team of world-leading experts in nano-science and technology from 6 European countries in order to achieve breakthroughs in understanding and successful utilization of photonic based nano-systems in emerging quantum technologies. The consortium of 8 academic and 3 industrial groups will deliver top international level multidisciplinary training to 15 early stage researchers, offering them an extended program of multinational exchanges and secondments. The training will be provided by world class research and industry institutions from Italy, UK, Germany, France, Switzerland, Netherlands. Full members of the network are the University of Milano Bicocca, Universities of Sheffield and University College of London, Technical University of Eindhoven, University of Wurzburg, National Centre for Scientific Research, University of Hamburg and Universities of Basel together with the industrial beneficiaries Toshiba Research Europe Ltd, Single Quantum and attocube systems AG. The associated partners are Ioffe Institute (Russia), National Institute of Materials Science (Japan), University of Firenze (Italy), EPSRC III-V Semiconductor Technology Facility (UK), Université d'Aix-Marseille de Provence et de Toulon (France), Kunglig Tekniska Hogskola (Sweden) and Think Ahead (UK). Network-wide training course in transferable skills will be specially developed and delivered by the Think Ahead (Sheffield), an award winning programme supporting Early Career Researchers (award by the Times Higher Education, 2014).
HiPerNanoWire: High-performance superconducting nanowire single-photon detectors Research Project | 2 Project MembersSuperconducting nanowire single-photon detectors (SNSPD) can achieve near-perfect detection efficiency over a broad spectral range. The goal of this project is to produce a complete solution for high-performance SNSPDs at a low fabrication cost. It will allow simple integration and alleviate the complexity of the cryogenics. Current users are mostly research labs, but are system will have the potential to reach widespread use in emerging commercial applications.
