Frank H. P. Fitzek

• Professor
• Aalborg University

We present the fabrication process of bright $GaAs$ quantum dot (QD) photon sources by non-deterministic embedding into broadband monolithic $Al_{0.15}Ga_{0.85}As$ microlens arrays on gold-coated substrates. Arrays of cylindrical photoresist templates, with diameters ranging from $2$ $\mu m$ to $5$ $\mu m$, are thermally reflowed and subsequently t...

The advent of Beyond 5G (emerging 6G) technologies represents a significant step forward in telecommunications, offering unprecedented data speeds and connectivity. These advances enable a wide range of applications, from enhanced mobile broadband and the Internet of Things to ultra-reliable low-latency communication and the tactical Internet. Thus...

Common Randomness (CR) provides sequences of random variables at two physically separated locations. Ideally, the random variables at the two locations should be identical, i.e., have low probability of discrepancy, and should have high entropy. Previous CR research has focused on CR for physical layer security (mainly physical layer secret key gen...

Congestion Control (CC) limits the transmission rate of data packets in the transport layer protocol, e.g., in TCP and QUIC, of a sending endpoint so as to mitigate the congestion in packet-switched communication networks. Numerous studies have developed and evaluated Congestion Control Algorithms (CCAs) for a wide range of network types. Prior sur...

Orientation estimation based on Inertial Measurement Units (IMUs) has emerged as a promising solution for real-time orientation tracking. Quaternion numbers are frequently employed by estimation algorithms to represent orientation in three-dimensional (3-D) space. In recent years, gradient descent-based algorithms have been extensively utilized for...

This paper investigates the integration of quantum randomness into Verifiable Random Functions (VRFs) using the Ed25519 elliptic curve to strengthen cryptographic security. By replacing traditional pseudorandom number generators with quantum entropy sources, we assess the impact on key security and performance metrics, including execution time, and...

This paper explores the potential of Vehicle-to-Everything (V2X) technology to enhance grid stability and support sustainable mobility in Dresden's Ostra district. By enabling electric vehicles to serve as mobile energy storage units, V2X offers grid stabilization and new business opportunities. We examine pilot projects and business use cases, foc...

COmputing In the Network (COIN) has the potential to reduce the data traffic and thus the end-to-end latencies for data-rich services. Existing COIN studies have neglected the impact of the size of the data unit that the network nodes compute on. However, similar to the impact of the protocol data unit (packet) size in conventional store-and-forwar...

Error estimation is an important step for error correction in quantum key distribution. Traditional error estimation methods require sacrificing a part of the sifted key, forcing a trade-off between the accuracy of error estimation and the size of the partial sifted key to be used and discarded. In this paper, we propose a hybrid approach that aims...

Network Function Virtualization (NFV) is envisioned to provide the foundation for a dynamic, high-performance multi-layer network architecture. With NFV, running network functions on general-purpose hardware is supposed to lower network latency due to reduced propagation delay. The trade-off, however, is in impaired reliability and increased proces...

Sliding Window Random Linear Network Coding (SW RLNC) is an enabler of Ultra Reliable Low Latency Communications (URLLC) and could be utilized in several emerging networking scenarios, such as the Tactile Internet. While SW RLNC is a quite mature technique, there have been limited efforts to explore how key coding parameters affect the reliability-...

The future Metaverse has been proposed as a solution to various social problems, requiring new concepts. This evolution of the Metaverse will be geared toward solving real-world tasks by combining humans and machines in virtual and real spaces. This, in turn, necessitates the inclusion of additional human senses, including the tactile modality, to...

Relay mechanisms are an important part of communication systems and, therefore, naturally occurring molecular communication (MC) links. Multiple techniques have been proposed for designing MC relay-aided setups, assuming synchronous operation and perfect timing during the decoding process. In this paper, we propose using a reinforcement learning (R...

The formation of plaques in human blood vessels, known as atherosclerosis, represents one of the major causes of death worldwide. Synthetic molecular communication (MC), in combination with nanotechnology, is envisioned to enable novel approaches toward diagnosing, monitoring, and treating diseases. In this paper, we propose an investigation of the...

This study focuses on the innovative field of quantum synchronization for satellite-based navigation systems including Global Navigation Satellite Systems (GNSSs) and the Non-Terrestrial Network (NTN) component of future 6G networks integrating both communication and navigation services. By combining a four-qubit system with the theoretical approac...

Quantum networks are designed to transmit quantum bits (qubits) among quantum devices to enable new network resources for the applications. Entanglement distribution and entanglement swapping are fundamental procedures that are required in several network operations. However, they are probabilistic operations, which can lead to severe network perfo...

Time-Sensitive Networking (TSN) encompasses standards to facilitate near-deterministic performance in wired networks and the integration of TSN with modern wireless systems, such as Fifth Generation (5G) systems, is intensely pursued. Consequently, TSN is examined by numerous research groups. Given the limited and costly access to TSN hardware, a r...

In light of the imperative for expeditious data processing and enhanced global connectivity, the domain of communication technology is experiencing a rapid progression from the Fifth Generation (5G) to the forthcoming Sixth Generation (6G) within the research community. Furthermore, 6G promises to significantly augment the synergy between the human...

The Tactile Internet (TI) is a revolutionary communication platform that enables perceived real-time interaction between humans and machines, such as in remote surgery. However, realizing TI is a complex challenge in wireless networks like the 5G and beyond 5G mobile communication systems. 5G-TSN is an approach adopting the determinism of Time-Sens...

5G and beyond networks are expected to host several heterogeneous verticals with very different requirements in terms of latency, data rate, etc. In the case of human-machine collaboration and cohabitation, very low latency is necessary to permit the seamless remote control of robots and the transmission of sensory experience involving not only aud...

The convergence of microfluidics and Molecular Communication (MC) has garnered significant attention in the context of the emerging Internet of Bio-Nano Things (IoBNT) paradigm. Microfluidic systems offer unique capabilities for manipulating fluids at the nanoscale, enabling precise control over molecular interactions. Potential IoBNT applications...

The present article analyzes aspects of the problem of remote state estimation via noisy communication channels (RSE) for their Blum-Shub-Smale (BSS) computability, motivated by an exemplary application to a formal model of virtual twinning subject to stringent integrity requirements. Computability theory provides a unique framework for the for...

We investigate the feasibility of computing quantum gate-circuit emulation (QGCE) and quantum gate-circuit concatenation (QGCC) on digital hardware. QGCE serves the purpose of rewriting gate circuits comprised of gates from a varying input gate set to gate circuits formed of gates from a fixed target gate set. Analogously, QGCC serves the purpose o...

This article discusses a formalization of aspects of Cyber-Sovereignty (CyS) for information and communication technology (ICT), linking them to technological trustworthiness and deriving an associated paradigm for hard- and software design. The upcoming 6G ICT standard is considered a keystone within modern society’s increasing interconnectednes...

The Radio Access Network (RAN) of Fifth Generation (5G) communication systems critically influences the overall performance and cost of a 5G system. 5G RANs allow for a gamut of implementations ranging from closed (carrier-grade) implementations by traditional vendors that are expensive and configured by the vendor to RANs that are compliant with t...

Low latency communication is a major challenge when humans have to be integrated into cyber physical systems with mixed realities. Recently, the concept of negative latency has been coined as a technique to use anticipatory computing and performing communication ahead of time. For this, behaviors of communication partners are predicted, e.g., by co...

The Tactile Internet aims to advance human-human and human-machine interactions that also utilize hand movements in real, digitized, and remote environments. Attention to elderly generations is necessary to make the Tactile Internet age inclusive. We present the first age-representative kinematic database consisting of various hand gesturing and gr...

This article compares two methods of algorithmically processing bandlimited time-continuous signals in light of the general problem of finding “suitable” representations of analog information on digital hardware. Albeit abstract, we argue that this problem is fundamental in digital twinning, a signal-processing paradigm the upcoming 6G communicatio...

This paper focuses on integrating Data Plane Development Kit (DPDK) and Service Function Chaining (SFC) on the OpenStack cloud OS to support network coding, enabling the OpenStack instance to function as a virtualized network coding service. The main points are: comparing OpenvSwitch-DPDK with native OpenvSwitch to confirm DPDK's significant networ...

This article discusses the interplay between mathematical models of physical entities and mathematical models of computing hardware, advocating its criticality concerning trustworthy virtual-twin technologies in near-future communication networks. The digital twinning of physical entities is widely recognized as a crucial factor in near-future info...

In order to provide consistent low-latency communication network services, Time-Sensitive Networking (TSN) unites a set of standards for time-synchronization, flow control, enhanced reliability, and management. We design the TSNFlexTest testbed with generic commodity hardware and opensource software components to enable flexible TSN measurements. W...