A5066192356- Quantum Computing Algorithms and Architecture
- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Distributed systems and fault tolerance
- Optical Network Technologies
- Quantum and electron transport phenomena
- Quantum optics and atomic interactions
Freie Universität Berlin
2020-2025
Universität Innsbruck
2016-2020
We consider the problem of generating multipartite entangled states in a quantum network upon request. follow top-down approach, where required entanglement is initially present form shared between devices, and then manipulated such way that desired target state generated. This minimizes generation times, allows for structures are principle independent physical links. modular flexible architecture, multi-layer consists devices varying complexity, including routers, switches clients, share...
Abstract A global quantum repeater network involving satellite-based links is likely to have advantages over fiber-based networks in terms of long-distance communication, since the photon losses vacuum scale only polynomially with distance – compared exponential optical fibers. To simulate performance such networks, we introduced a scheme large-scale event-based Monte Carlo simulation repeaters multiple memories that can faithfully represent loss and imperfections these memories. In this...
The endeavor to develop quantum networks gave rise a rapidly developing field with far-reaching applications such as secure communication and the realization of distributed computing tasks. This ultimately calls for creation flexible multiuser structures that allow between arbitrary pairs parties in network facilitate also applications. To address this challenge, we propose two-dimensional repeater architecture establish long-distance entanglement shared multiple partners presence channel...
Machine learning can help us in solving problems the context of big-data analysis and classification, as well playing complex games such Go. But it also be used to find novel protocols algorithms for applications large-scale quantum communication? Here we show that machine identify central protocols, including teleportation, entanglement purification, repeater. These schemes are importance long-distance communication, their discovery has shaped field information processing. However,...
Quantum repeaters have long been established to be essential for distributing entanglement over distances. Consequently, their experimental realization constitutes a core challenge of quantum communication. However, there are numerous open questions about implementation details realistic near-term setups. In order assess the performance repeater protocols, here we present ReQuSim, comprehensive Monte Carlo–based simulation platform that faithfully includes loss and models wide range...
Entanglement-based quantum networks exhibit a unique flexibility in the choice of entangled resource states that are then locally manipulated by nodes to fulfill any request network. Furthermore, this manipulation is not uniquely defined and thus can be optimized. We tailor adaptation state or pre-established entanglement achieve bipartite communication an imperfect setting includes time-dependent memory errors. In same setting, we study how approach used for distribution fully asymmetric...
We introduce an alternative approach for the design of quantum repeaters based on generating entangled states growing size. The scheme utilizes merging operations, also known as fusion type-I that allow reintegration and reuse entanglement. Unlike conventional swapping-based protocols, our method preserves entanglement after failed thereby reducing waiting times, enabling higher rates, introducing enhanced flexibility in communication requests. Through proof-of-principle analysis, we...
We investigate measurement-based quantum communication with noisy resource states that are generated by entanglement purification. consider the transmission of encoded information via channels using a implementation encoding, error correction, and decoding. show such an approach offers advantages over direct transmission, gate-based schemes generation states. analyze noise structure purification local model, i.e., acting independently on all qubits state, is good approximation in general,...
We introduce a repeater scheme to efficiently distribute multipartite entangled states in quantum network with optimal scaling. The allows generate graph such as 2D and 3D cluster of growing size or GHZ over arbitrary distances, constant overhead per node/channel that is independent the distance. approach genuine multipartite, based on measurement-based implementation hashing, an entanglement purification protocol operates large ensemble together local merging/connection elementary building...
It has recently been theoretically shown that Quantum Memories (QM) could enable truly global quantum networking when deployed in space thereby surpassing the limited range of land-based repeaters. Furthermore, QM novel protocols and long-range entanglement teleportation applications suitable for Deep-Space links extended scenarios fundamental physics tests. In this white paper we will make case importance deploying QMs to space, also discuss major technical milestones development stages...
We consider the explicit construction of resource states for measurement-based quantum information processing. concentrate on special-purpose that are capable to perform a certain operation or task, where we unitary Clifford circuits as well non-trace-preserving completely positive maps, more specifically probabilistic operations including and Pauli measurements. $1\ensuremath{\rightarrow}m$ $m\ensuremath{\rightarrow}1$ operations, i.e., map one input qubit $m$ output qubits vice versa....
Entanglement-based quantum networks exhibit a unique flexibility in the choice of entangled resource states that are then locally manipulated by nodes to fulfill any request network. Furthermore, this manipulation is not uniquely defined and thus can be optimized. We tailor adaptation state or pre-established entanglement achieve bipartite communication an imperfect setting includes time-dependent memory errors. In same setting, we study how approach used for distribution fully asymmetric...
Quantum repeaters have long been established to be essential for distributing entanglement over distances. Consequently, their experimental realization constitutes a core challenge of quantum communication. However, there are numerous open questions about implementation details realistic, near-term setups. In order assess the performance realistic repeater protocols, we here present ReQuSim, comprehensive Monte-Carlo based simulation platform that faithfully includes loss and models wide...