Observation of nonadditive mixed state phases with polarized neutrons

In a neutron polarimetry experiment the mixed state relative phases between spin eigenstates are determined from the maxima and minima of measured intensity oscillations. We consider evolutions leading to purely geometric, purely dynamical and combined phases. It is experimentally demonstrated that the sum of the individually determined geometric and dynamical phases is not equal to the associated total phase which is obtained from a single measurement, unless the system is in a pure state.Comment: RevTex, 4 pages, 4 figures, accepted by PR

Bose-Einstein condensate as a quantum memory for a photonic polarization qubit

A scheme based on electromagnetically induced transparency is used to store light in a Bose-Einstein condensate. In this process, a photonic polarization qubit is stored in atomic Zeeman states. The performance of the storage process is characterized and optimized. The average process fidelity is 1.000 +/- 0.004. For long storage times, temporal fluctuations of the magnetic field reduce this value, yielding a lifetime of the fidelity of 1.1 +/- 0.2 ms. The write-read efficiency of the pulse energy can reach 0.53 +/- 0.05

Controlling a magnetic Feshbach resonance with laser light

The capability to tune the strength of the elastic interparticle interaction is crucial for many experiments with ultracold gases. Magnetic Feshbach resonances are a tool widely used for this purpose, but future experiments would benefit from additional flexibility such as spatial modulation of the interaction strength on short length scales. Optical Feshbach resonances offer this possibility in principle, but suffer from fast particle loss due to light-induced inelastic collisions. Here we show that light near-resonant with a molecular bound-to-bound transition can be used to shift the magnetic field at which a magnetic Feshbach resonance occurs. This makes it possible to tune the interaction strength with laser light and at the same time induce considerably less loss than an optical Feshbach resonance would do

Beyond Traditional Energy Sector Coupling: Conserving and Efficient Use of Local Resources

Decentralisation and sector coupling are becoming increasingly crucial for the decarbonisation of the energy system. Resources such as waste and water have high energy recovery potential and are required as inputs for various conversion technologies; however, waste and water have not yet been considered in sector coupling approaches but only in separate examinations. In this work, an open-source sector coupling optimisation model considering all of these resources and their utilisation is developed and applied in a test-bed in an Israeli city. Our investigations include an impact assessment of energy recovery and resource utilisation in the transition to a hydrogen economy, with regard to the inclusion of greywater and consideration of emissions. Additionally, sensitivity analyses are performed in order to assess the complexity level of energy recovery. The results demonstrate that waste and water energy recovery can provide high contributions to energy generation. Furthermore, greywater use can be vital to cover the water demands in scarcity periods, thus saving potable water and enabling the use of technology. Regarding the transition to hydrogen technologies, resource energy recovery and management have an even higher effect than in the original setup. However, without appropriate resource management, a reduction in emissions cannot be achieved. Furthermore, the sensitivity analyses indicate the existence of complex relationships between energy recovery technologies and other energy system operations

Beyond Traditional Energy Sector Coupling: Conserving and Efficient Use of Local Resources

Decentralisation and sector coupling are becoming increasingly crucial for the decarbonisation of the energy system. Resources such as waste and water have high energy recovery potential and are required as inputs for various conversion technologies; however, waste and water have not yet been considered in sector coupling approaches but only in separate examinations. In this work, an open-source sector coupling optimisation model considering all of these resources and their utilisation is developed and applied in a test-bed in an Israeli city. Our investigations include an impact assessment of energy recovery and resource utilisation in the transition to a hydrogen economy, with regard to the inclusion of greywater and consideration of emissions. Additionally, sensitivity analyses are performed in order to assess the complexity level of energy recovery. The results demonstrate that waste and water energy recovery can provide high contributions to energy generation. Furthermore, greywater use can be vital to cover the water demands in scarcity periods, thus saving potable water and enabling the use of technology. Regarding the transition to hydrogen technologies, resource energy recovery and management have an even higher effect than in the original setup. However, without appropriate resource management, a reduction in emissions cannot be achieved. Furthermore, the sensitivity analyses indicate the existence of complex relationships between energy recovery technologies and other energy system operations

Trends in local electricity market design: Regulatory barriers and the role of grid tariffs

New concepts of local electricity markets (LEMs) have led increased focus on the decentralization of energy systems and a raise in local energy communities (LECs). Under the right market-regulatory incentives, peer-to peer (P2P) electricity trading schemes facilitate direct trade among the prosumers and enable active consumers of energy to share the self-generated electricity and make effective use of flexibility services provided by distributed energy resources (DERs). The paper presents a review of the state of implementation of LEMs and P2P. The research questions are: What grid tariff designs affect the value of peer-to-peer? How does a local energy market benefit from grid tariff designs? To address these questions, the authors survey the latest regulatory frameworks in Europe, focusing especially on Austria, Ireland, and Norway

Trends in local electricity market design: Regulatory barriers and the role of grid tariffs

New concepts of local electricity markets (LEMs) have led increased focus on the decentralization of energy systems and a raise in local energy communities (LECs). Under the right market-regulatory incentives, peer-to peer (P2P) electricity trading schemes facilitate direct trade among the prosumers and enable active consumers of energy to share the self-generated electricity and make effective use of flexibility services provided by distributed energy resources (DERs). The paper presents a review of the state of implementation of LEMs and P2P. The research questions are: What grid tariff designs affect the value of peer-to-peer? How does a local energy market benefit from grid tariff designs? To address these questions, the authors survey the latest regulatory frameworks in Europe, focusing especially on Austria, Ireland, and Norway.Trends in local electricity market design: Regulatory barriers and the role of grid tariffspublishedVersio

Trends in local electricity market design: Regulatory barriers and the role of grid tariffs

New concepts of local electricity markets (LEMs) have led increased focus on the decentralization of energy systems and a raise in local energy communities (LECs). Under the right market-regulatory incentives, peer-to peer (P2P) electricity trading schemes facilitate direct trade among the prosumers and enable active consumers of energy to share the self-generated electricity and make effective use of flexibility services provided by distributed energy resources (DERs). The paper presents a review of the state of implementation of LEMs and P2P. The research questions are: What grid tariff designs affect the value of peer-to-peer? How does a local energy market benefit from grid tariff designs? To address these questions, the authors survey the latest regulatory frameworks in Europe, focusing especially on Austria, Ireland, and Norway