Browsing by Author "Durak, Kadir"
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Experimental investigation of pointing errors on drone-based FSO systems
Airborne free-space optical (FSO) communication links can be efficiently used for backhaul/fronthaul needs of future cellular networks. Unlike terrestrial FSO links where a fixed connection between two buildings is considered, ... -
Noise-tolerant object detection and ranging using quantum correlations
Kuniyil, Hashir Puthiyapurayil; Özel, Helin; Yılmaz, H.; Durak, Kadir (IOP Publishing, 2022-10)Imaging, detection and ranging of objects in the presence of significant background noise is a fundamental challenge in optical sensing. Overcoming the limitations imposed in conventional methods, quantum light sources ... -
Object ranging and sensing by temporal cross-correlation measurement
Kuniyil, Hashir Puthiyapurayil; Jam, Naser Chamani; Durak, Kadir (SPIE, 2020)We present a novel method to measure the range of an object in a lab setting. This is realised by utilizing the phase insensitive cross-correlation analysis of the probe and reference photons generated in a spontaneous ... -
Object tracking and identification by quantum radar
Durak, Kadir; Jam, Naser Chamani; Dindar, Çağrı (SPIE, 2019)Quantum Radar is a promising technology that could have a strong impact on the civilian and military realms. In this study we introduce a new concept design for implementing a Quantum Radar, based on the time and polarization ... -
Optical quantum dot films for wide color gamut smart phone displays
Mutcu, Süleyman Efdal (2019-05-08)Liquid crystal display (LCD) technology is a fundamental constituent of today’s smart phones for image formation. LCDs are required to have a back light unit (BLU) to create a uniform white light with the correct color ... -
Optimization of collection optics for maximum fidelity in entangled photon sources
Durak, Kadir (TÜBİTAK, 2020)In this report, decoherence sources for entangled photons created by spontaneous parametric down-conversion phenomenon are studied. The phase and spatial distinguishability of photon pairs from orthogonal crystals reduce ... -
Performance analysis of quantum key distribution in underwater turbulence channels
The current literature on quantum key distribution (QKD) is mainly limited to the transmissions over ber optic, atmospheric or satellite links and are not directly applicable to underwater environments with di erent channel ... -
Performance analysis of vertical underwater visible light communication link
Yılmaz, Anıl (2018-07)Demand for high-bandwidth underwater applications such as image and real-time video transmission, has been increasing parallel to the increase in maritime activities such as environment monitoring, navigation, ocean-pollution ... -
Performance characterization of vehicular visible light communications
Karbalayghareh, Mehdi (2019-07-16)In Intelligent Transportation Systems (ITSs), visible light communication (VLC) has emerged as a powerful candidate to enable wireless connectivity in vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) links. VLC ... -
Performance evaluation and experimental verification of vehicular visible light communication
Araç geliştirme, gelecekteki bazı uygulamalarını desteklemek için büyük ölçüde veri iletişimine aktarır. Araç müfrezesi ve otonom araçlar (AV), bu on yılda ticari olarak temin edilebilecek uygulamalardan bazılarıdır. Bu ... -
Photon statistics effects on a QRNG of vacuum fluctuations
Dandaşi, Abdulrahman; Özel, Helin; Durak, Kadir (Optica Publishing Group, 2020-09-14)Optical scattering enhances randomness characteristics, increases the chaotic behavior of coherent sources, broadens the distribution of photon statistics and makes it super-Poissonian which allows faster sampling compared ... -
Pseudothermal light based quantum random number generator
Özel, H.; Dandaşi, Abdulrahman; Durak, Kadir (IEEE, 2020-10-22)The importance of quantum random number generators (QRNGs) is increasing day by day. An important aspect of any QRNG is the speed of the system. This paper introduces the theory behind a pseudothermal light based QRNG. ... -
Pseudothermal light based quantum random number generator
Dandaşi, Abdulrahman (2021-01-18)Random number generators (RNGs) have recently gained lots of attention from the scientific and commercial communities recently. That is due to computers' fast development, making cracking cryptographic systems faster than ... -
PYNQ-based rapid FPGA implementation of quantum key distribution
Bilgin, Yiğit; Tesfay, Shewıt Weldu; İpek, Seçkin; Uğurdağ, Hasan Fatih; Durak, Kadir; Gören, S. (IEEE, 2021)In this paper, we present a real-time Quantum Key Distribution (QKD) implementation on Field Programmable Gate Arrays (FPGAs) for secure communication. We propose a novel methodology with a Python-based programming interface ... -
Quantum signatures in a quadratic optomechanical heat engine with an atom in a tapered trap
Izadyari, M.; Öncü, Mehmet; Durak, Kadir; Müstecaplioğlu, Ö. E. (Optica Publishing Group, 2022-12)We investigate how quantum signatures can emerge in a single atom heat engine consisting of an atom confined in a tapered trap and subjected to hot and cold thermal reservoirs. A similar system was realized experimentally ... -
Side-channel attack to quantum communications by exploiting electromagnetic radiations of the single photon detectors
Jam, Naser Chamani (2020-08-30)In this thesis an unprecedented cyber-physical attack which can be a game changer in the quantum cryptosystems' security is explained. This attack is the first non-optical patented intercept in quantum field that is based ... -
Simultaneous lightwave information and power transfer in underwater visible light communications
In this thesis, we investigate simultaneous lightwave information and power transfer (SLIPT) for underwater visible light communication systems. We consider four SLIPT methods namely AC-DC separation (ADS), time switching ... -
Single photon detection with silicon-based avalanche photodiode
Yerli, Burcu; Eraydın, Can; Cinkaya, H.; Durak, Kadir (SPIE, 2023)Thanks to the significant advances in quantum technologies, the use of single photon detectors (SPDs) is becoming increasingly common. As a result of the excellent photodetection performance of these detectors, they have ... -
Small form factor PCB-based air coil for CubeSats
pace missions using Earth's magnetic field to achieve effective attitude determination and control (orientation) is becoming more and more popular at relatively low altitudes, Low Earth Orbit (LEO). CubeSats (U-class ... -
Theory and experiment of a non-radiative wireless power transfer method for a lane moving robot
Today, the usage of robots is growing in the warehouses for automated organizing of goods and in the field for harvesting foods and other agriculture tasks. Many big resellers use robots in their distribution warehouses ...
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