A5018732434- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Neural Networks and Reservoir Computing
- Photonic and Optical Devices
- Advanced Memory and Neural Computing
- Advanced Thermodynamics and Statistical Mechanics
- Orbital Angular Momentum in Optics
- Quantum optics and atomic interactions
- Optical Network Technologies
- Atomic and Subatomic Physics Research
- Electrical and Bioimpedance Tomography
- Neural dynamics and brain function
- Advanced MRI Techniques and Applications
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Optical Sensing Technologies
- Mechanical and Optical Resonators
- Optical measurement and interference techniques
- Thermal Radiation and Cooling Technologies
- Statistical and numerical algorithms
- Advanced Fiber Optic Sensors
- Advanced MEMS and NEMS Technologies
University of Vienna
2021-2024
Vienna Center for Quantum Science and Technology
2022-2024
TU Wien
2023
FH Campus Wien
2022
Abstract Memristive devices are a class of physical systems with history-dependent dynamics characterized by signature hysteresis loops in their input–output relations. In the past few decades, memristive have attracted enormous interest electronics. This is because very pervasive nanoscale devices, and has potentially groundbreaking applications ranging from energy-efficient memories to neural networks neuromorphic computing platforms. Recently, concept quantum memristor was introduced...
In the macroscopic world, time is intrinsically asymmetric, flowing in a specific direction, from past to future. However, same not necessarily true for quantum systems, as some processes produce valid evolutions under reversal. Supposing that such can be probed both directions, we also consider coherent superposition of forward and backward directions. This yields broader class than ones considered so far literature, including those with indefinite causal order. this work, demonstrate an...
State of the art classical and quantum communications rely on standard optical fibers with solid cores to transmit light over long distances. However, recent advances have led emergence antiresonant hollow-core (AR-HCFs), which, due novel fiber geometry, show remarkable guiding properties, which are not as limited by material properties solid-core fibers. In this paper, we explore transmission entangled photons through a 7.7 km AR-HCF in laboratory environment at 1550 nm, presenting first...
The field of indefinite causal order (ICO) has seen a recent surge in interest. Much this research focused on the quantum SWITCH, wherein multiple parties act superposition different orders manner transcending circuit model. This results new resource for protocols, and is exciting its relation to issues foundational physics. SWITCH also an example higher-order operation, that it not only transforms states, but other operations. To date, no operation been completely experimentally...
Maxwell's Demon is at the heart of interrelation between quantum information processing and thermodynamics. In this thought experiment, a demon generates temperature gradient two thermal baths initially equilibrium by gaining single-particle level applying classical feed-forward operations, allowing for extraction work. Here we implement photonic version with active in fibre-based system using ultrafast optical switches. We experimentally show that, if correlations exist baths, can...
State of the art classical and quantum communication rely on standard optical fibers with solid cores to transmit light over long distances. However, recent advances have led emergence antiresonant hollow-core (AR-HCFs), which due novel fiber geometry, show remarkable guiding properties, are not as limited by material properties solid-core fibers. In this paper, we explore transmission entangled photons through a 7.7 km AR-HCF in laboratory environment at 1550 nm, presenting first successful...
The authors optically analyze the torsional mechanical modes of a tapered optical fiber. observed quality factor fundamental mode fiber waist is as large 10${}^{7}$ and $Q\phantom{\rule{0}{0ex}}f$ product 1 THz promisingly close to threshold value 6 THz, required for room-temperature quantum optomechanics. Using feedback cooling, cool motional temperature from room only 30 mK.
We experimentally demonstrate a device-independent verification and certification of tripartite GHZ states in sample-efficient way. Our high-performance table-top multiphoton source promises high fidelity confidence level, by consuming only few hundred samples.
We show that hollow-core fibers have emerged for quantum technology by distributing entangled time-bin qubits over a 7 . km fiber. study this fiber’s advantages in transmission speed and dispersion broad spectral range.
The quantum switch is a process with an indefinite causal order, going beyond the circuit model. We introduce and perform tomography protocol for such processes, testing it on novel implementation of switch.
Entangled quantum states are essential ingredients for many technologies, but they must be validated before used. As a full characterization is prohibitively resource-intensive, recent work has focused on developing methods to efficiently extract few parameters of interest, in so-called verification framework. Most existing approaches based preparing an ensemble nominally identical and independent (IID) states, then measuring each copy the ensemble. However, this leaves no left intended...
Tapered optical fibers (TOFs) are used in many areas of physics and technologies ranging from coupling light into nanophotonic components to sensing amplification interfacing quantum emitters. Here, we study the fundamental torsional mechanical mode nanofiber-waist a TOF using laser light. We find that this oscillator features quality factor up $10^7$ $Qf$ product 1 THz. damp thermal motion room temperature 28(7) mK by means active feedback. Our results might enable new types fiber-based...
We distribute entangled time-bin qubits, separated by 200 picoseconds, through a low-latency 7.7 km hollow-core fiber. Due to dispersion, these time bins cannot be resolved when sent commercial silica fiber of the same length.
Less than ten years ago it was realized that quantum theory permits the existence of processes which do not have a defined causal order. To date, several experiments confirmed one such process, called SWITCH, in is impossible to say two parties acts first. This has since spawned new field research on with an indefinite Building mathematical analogy entanglement certification, various methods quantify lack order been proposed and demonstrated. These characterization techniques range from...
Maxwell’s Demon is at the heart of interrelation between quantum information processing and thermodynamics. In this thought experiment, a demon extracts work from two thermal baths equilibrium by gaining about them single-particle level applying classical feed-forward operations. talk I will show how to implement photonic version with active in fiber-based system using ultrafast optical switches. This first realisation an Demon. The experiment [1] shows that, if correlations exist baths, can...