Prof. Dr. Philipp Treutlein Department of Physics Profiles & Affiliations OverviewResearch Publications Projects & Collaborations Projects & Collaborations OverviewResearch Publications Projects & Collaborations Profiles & Affiliations Projects & Collaborations 31 foundShow per page10 10 20 50 Spatially distributed entanglement of ultracold atomic ensembles Research Project | 1 Project MembersImported from Grants Tool 4703002 Coherent feedback control in optomechanics Research Project | 1 Project MembersImported from Grants Tool 4701926 On-wafer microwave metrology for future industrial applications Research Project | 1 Project MembersImported from Grants Tool 4696293 Cavity-free quantum optomechanics Research Project | 2 Project MembersImported from Grants Tool 4695622 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. Potential of quantum sensing for precision metrology at METAS Research Project | 2 Project MembersIn the field of quantum sensing, new techniques have been developed that exploit quantum systems and their peculiar properties to enable new functionality and enhance accuracy and precision in a great variety of sensing applications. Researchers at the Department of Physics of the University of Basel have made important contributions to this field. The goal of this collaboration project is to evaluate the potential of quantum sensing techniques for metrology at METAS, the Swiss national metrology institute. Field sensing with atomic vapour cells Research Project | 1 Project MembersThe goal of the project is to explore potential commercial and industrial applications of electromagnetic field sensing with atomic vapour cells. LASERLOOP / Laser loop for engineering long-distance interactions in hybrid quantum systems Research Project | 2 Project MembersLight is a powerful carrier of quantum information and an established tool to manipulate matter at the quantum level. In this action, we explore a novel technique of using light in quantum physics and technology: As a means to generate for the first time strong, quantum coherent interactions between different systems over macroscopic distances. Our approach relies on a laser loop that connects the systems and mediates coherent bidirectional interactions between them. This is possible due to a destructive interference of the quantum noise introduced by the light, otherwise responsible for decoherence. At the same time, information is erased from the output field, making the loop effectively closed to the environment. This makes it possible to achieve quantum coherent coupling between the systems. QUSTEC PhD fellowship - Hybrid quantum networks with atomic memories and quantum dot single-photon sources Research Project | 1 Project MembersThis project aims at combining the high purity and large bandwidth of quantum dot single photons with the high efficiency and long storage times of atomic quantum memories into a hybrid quantum network architecture with advantageous properties. We already demonstrated that GaAs/AlGaAs quantum dots can emit transform-limited single photons tuned into resonance with rubidium atoms and that the temporal waveform of these photons can be controlled. In parallel, we realized a rubidium atomic quantum memory with a bandwidth of 660 MHz operating on the single-photon level. The goal of this project is to develop the two systems further and to interface them through an optical fiber link. Several improvements will be implemented to achieve low-noise operation: controlling the charge state of the dot and enhancing the photon collection efficiency with an optical cavity, as well as controlling the spin state of the atoms to suppress four-wave mixing noise by selection rules. After demonstrating storage and retrieval of quantum dot single photons in the atomic memory, we intend to perform basic quantum networking tasks with this hybrid system. Non-classical correlations in ultracold atomic ensembles Research Project | 1 Project MembersNon-classical correlations between quantum systems lead to the most striking departure of quantum from classical physics. Despite decades of research, such correlations still present many conceptual and experimental challenges, while at the same time their key role in quantum technologies is recognised. This is particularly true for systems of many particles, where different classes of non-classical states exist with different usefulness for technological tasks. There are open questions on how to generate, control, detect, and exploit non-classical correlations, in particular in large ensembles where access to individual particles is limited. To elucidate these questions has become a subject of intense research on different experimental platforms. Ultracold atomic ensembles are quantum many-particle systems par excellence: (1) atoms are very well isolated from the environment and feature long coherence times, (2) ensembles with adjustable atom number from a few hundreds to millions can be reliably generated, (3) a powerful toolbox for control and measurement of their quantum state is available, and (4) atom-atom interactions can be tuned and engineered to generate correlations in a controlled way. These unique features make ultracold atomic ensembles an ideal system for the experimental study of non-classical correlations in many-particle systems, which is the overarching goal of this project. We will use two complementary approaches to pursue this goal: In the first approach, we will investigate atomic two-component Bose-Einstein condensates on an atom chip. Non-classical correlations between the atomic spins are generated by controlled collisions in a state-dependent potential. A specific focus of the experiments will be the distribution of non-classical correlations from one to several spatially separated and individually addressable condensates, with the goal to demonstrate entanglement and Einstein-Podolsky-Rosen steering and to investigate schemes for interferometry with spatially split condensates near the atom chip surface. In the second approach we will explore a new scheme for generating non-classical correlations in large atomic spin ensembles based on light-mediated Hamiltonian interactions. Using a new experimental setup with ultracold atoms in an optical dipole trap, we will generate collective spin-spin interactions by multi-pass atom-light interactions with free-space laser beams. This scheme is promising for quantum manipulation of large atomic ensembles in a simple geometry, potentially interesting for precision metrology. This project is expected to lead to novel insights into generation and control of non-classical correlations in ultracold atomic ensembles, their distribution into spatially separated, individually controllable systems, and their use in quantum technologies, in particular sensing, metrology and imaging. 1234 1...4 OverviewResearch Publications Projects & Collaborations
Projects & Collaborations 31 foundShow per page10 10 20 50 Spatially distributed entanglement of ultracold atomic ensembles Research Project | 1 Project MembersImported from Grants Tool 4703002 Coherent feedback control in optomechanics Research Project | 1 Project MembersImported from Grants Tool 4701926 On-wafer microwave metrology for future industrial applications Research Project | 1 Project MembersImported from Grants Tool 4696293 Cavity-free quantum optomechanics Research Project | 2 Project MembersImported from Grants Tool 4695622 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. Potential of quantum sensing for precision metrology at METAS Research Project | 2 Project MembersIn the field of quantum sensing, new techniques have been developed that exploit quantum systems and their peculiar properties to enable new functionality and enhance accuracy and precision in a great variety of sensing applications. Researchers at the Department of Physics of the University of Basel have made important contributions to this field. The goal of this collaboration project is to evaluate the potential of quantum sensing techniques for metrology at METAS, the Swiss national metrology institute. Field sensing with atomic vapour cells Research Project | 1 Project MembersThe goal of the project is to explore potential commercial and industrial applications of electromagnetic field sensing with atomic vapour cells. LASERLOOP / Laser loop for engineering long-distance interactions in hybrid quantum systems Research Project | 2 Project MembersLight is a powerful carrier of quantum information and an established tool to manipulate matter at the quantum level. In this action, we explore a novel technique of using light in quantum physics and technology: As a means to generate for the first time strong, quantum coherent interactions between different systems over macroscopic distances. Our approach relies on a laser loop that connects the systems and mediates coherent bidirectional interactions between them. This is possible due to a destructive interference of the quantum noise introduced by the light, otherwise responsible for decoherence. At the same time, information is erased from the output field, making the loop effectively closed to the environment. This makes it possible to achieve quantum coherent coupling between the systems. QUSTEC PhD fellowship - Hybrid quantum networks with atomic memories and quantum dot single-photon sources Research Project | 1 Project MembersThis project aims at combining the high purity and large bandwidth of quantum dot single photons with the high efficiency and long storage times of atomic quantum memories into a hybrid quantum network architecture with advantageous properties. We already demonstrated that GaAs/AlGaAs quantum dots can emit transform-limited single photons tuned into resonance with rubidium atoms and that the temporal waveform of these photons can be controlled. In parallel, we realized a rubidium atomic quantum memory with a bandwidth of 660 MHz operating on the single-photon level. The goal of this project is to develop the two systems further and to interface them through an optical fiber link. Several improvements will be implemented to achieve low-noise operation: controlling the charge state of the dot and enhancing the photon collection efficiency with an optical cavity, as well as controlling the spin state of the atoms to suppress four-wave mixing noise by selection rules. After demonstrating storage and retrieval of quantum dot single photons in the atomic memory, we intend to perform basic quantum networking tasks with this hybrid system. Non-classical correlations in ultracold atomic ensembles Research Project | 1 Project MembersNon-classical correlations between quantum systems lead to the most striking departure of quantum from classical physics. Despite decades of research, such correlations still present many conceptual and experimental challenges, while at the same time their key role in quantum technologies is recognised. This is particularly true for systems of many particles, where different classes of non-classical states exist with different usefulness for technological tasks. There are open questions on how to generate, control, detect, and exploit non-classical correlations, in particular in large ensembles where access to individual particles is limited. To elucidate these questions has become a subject of intense research on different experimental platforms. Ultracold atomic ensembles are quantum many-particle systems par excellence: (1) atoms are very well isolated from the environment and feature long coherence times, (2) ensembles with adjustable atom number from a few hundreds to millions can be reliably generated, (3) a powerful toolbox for control and measurement of their quantum state is available, and (4) atom-atom interactions can be tuned and engineered to generate correlations in a controlled way. These unique features make ultracold atomic ensembles an ideal system for the experimental study of non-classical correlations in many-particle systems, which is the overarching goal of this project. We will use two complementary approaches to pursue this goal: In the first approach, we will investigate atomic two-component Bose-Einstein condensates on an atom chip. Non-classical correlations between the atomic spins are generated by controlled collisions in a state-dependent potential. A specific focus of the experiments will be the distribution of non-classical correlations from one to several spatially separated and individually addressable condensates, with the goal to demonstrate entanglement and Einstein-Podolsky-Rosen steering and to investigate schemes for interferometry with spatially split condensates near the atom chip surface. In the second approach we will explore a new scheme for generating non-classical correlations in large atomic spin ensembles based on light-mediated Hamiltonian interactions. Using a new experimental setup with ultracold atoms in an optical dipole trap, we will generate collective spin-spin interactions by multi-pass atom-light interactions with free-space laser beams. This scheme is promising for quantum manipulation of large atomic ensembles in a simple geometry, potentially interesting for precision metrology. This project is expected to lead to novel insights into generation and control of non-classical correlations in ultracold atomic ensembles, their distribution into spatially separated, individually controllable systems, and their use in quantum technologies, in particular sensing, metrology and imaging. 1234 1...4
Spatially distributed entanglement of ultracold atomic ensembles Research Project | 1 Project MembersImported from Grants Tool 4703002
Coherent feedback control in optomechanics Research Project | 1 Project MembersImported from Grants Tool 4701926
On-wafer microwave metrology for future industrial applications Research Project | 1 Project MembersImported from Grants Tool 4696293
Cavity-free quantum optomechanics Research Project | 2 Project MembersImported from Grants Tool 4695622
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.
Potential of quantum sensing for precision metrology at METAS Research Project | 2 Project MembersIn the field of quantum sensing, new techniques have been developed that exploit quantum systems and their peculiar properties to enable new functionality and enhance accuracy and precision in a great variety of sensing applications. Researchers at the Department of Physics of the University of Basel have made important contributions to this field. The goal of this collaboration project is to evaluate the potential of quantum sensing techniques for metrology at METAS, the Swiss national metrology institute.
Field sensing with atomic vapour cells Research Project | 1 Project MembersThe goal of the project is to explore potential commercial and industrial applications of electromagnetic field sensing with atomic vapour cells.
LASERLOOP / Laser loop for engineering long-distance interactions in hybrid quantum systems Research Project | 2 Project MembersLight is a powerful carrier of quantum information and an established tool to manipulate matter at the quantum level. In this action, we explore a novel technique of using light in quantum physics and technology: As a means to generate for the first time strong, quantum coherent interactions between different systems over macroscopic distances. Our approach relies on a laser loop that connects the systems and mediates coherent bidirectional interactions between them. This is possible due to a destructive interference of the quantum noise introduced by the light, otherwise responsible for decoherence. At the same time, information is erased from the output field, making the loop effectively closed to the environment. This makes it possible to achieve quantum coherent coupling between the systems.
QUSTEC PhD fellowship - Hybrid quantum networks with atomic memories and quantum dot single-photon sources Research Project | 1 Project MembersThis project aims at combining the high purity and large bandwidth of quantum dot single photons with the high efficiency and long storage times of atomic quantum memories into a hybrid quantum network architecture with advantageous properties. We already demonstrated that GaAs/AlGaAs quantum dots can emit transform-limited single photons tuned into resonance with rubidium atoms and that the temporal waveform of these photons can be controlled. In parallel, we realized a rubidium atomic quantum memory with a bandwidth of 660 MHz operating on the single-photon level. The goal of this project is to develop the two systems further and to interface them through an optical fiber link. Several improvements will be implemented to achieve low-noise operation: controlling the charge state of the dot and enhancing the photon collection efficiency with an optical cavity, as well as controlling the spin state of the atoms to suppress four-wave mixing noise by selection rules. After demonstrating storage and retrieval of quantum dot single photons in the atomic memory, we intend to perform basic quantum networking tasks with this hybrid system.
Non-classical correlations in ultracold atomic ensembles Research Project | 1 Project MembersNon-classical correlations between quantum systems lead to the most striking departure of quantum from classical physics. Despite decades of research, such correlations still present many conceptual and experimental challenges, while at the same time their key role in quantum technologies is recognised. This is particularly true for systems of many particles, where different classes of non-classical states exist with different usefulness for technological tasks. There are open questions on how to generate, control, detect, and exploit non-classical correlations, in particular in large ensembles where access to individual particles is limited. To elucidate these questions has become a subject of intense research on different experimental platforms. Ultracold atomic ensembles are quantum many-particle systems par excellence: (1) atoms are very well isolated from the environment and feature long coherence times, (2) ensembles with adjustable atom number from a few hundreds to millions can be reliably generated, (3) a powerful toolbox for control and measurement of their quantum state is available, and (4) atom-atom interactions can be tuned and engineered to generate correlations in a controlled way. These unique features make ultracold atomic ensembles an ideal system for the experimental study of non-classical correlations in many-particle systems, which is the overarching goal of this project. We will use two complementary approaches to pursue this goal: In the first approach, we will investigate atomic two-component Bose-Einstein condensates on an atom chip. Non-classical correlations between the atomic spins are generated by controlled collisions in a state-dependent potential. A specific focus of the experiments will be the distribution of non-classical correlations from one to several spatially separated and individually addressable condensates, with the goal to demonstrate entanglement and Einstein-Podolsky-Rosen steering and to investigate schemes for interferometry with spatially split condensates near the atom chip surface. In the second approach we will explore a new scheme for generating non-classical correlations in large atomic spin ensembles based on light-mediated Hamiltonian interactions. Using a new experimental setup with ultracold atoms in an optical dipole trap, we will generate collective spin-spin interactions by multi-pass atom-light interactions with free-space laser beams. This scheme is promising for quantum manipulation of large atomic ensembles in a simple geometry, potentially interesting for precision metrology. This project is expected to lead to novel insights into generation and control of non-classical correlations in ultracold atomic ensembles, their distribution into spatially separated, individually controllable systems, and their use in quantum technologies, in particular sensing, metrology and imaging.
