177 citations · 610 across the 22 of their papers we have counts for
22 papers
Modeling Optical Key Distribution over a Satellite-to-Ground Link Under Weak Atmospheric Turbulence
Artur Czerwinski, Mikołaj Lasota, Marcin Jarzyna +3
In this study, we analyze the secret key capacity of intensity modulation/direct detection optical key distribution (IM/DD OKD) for a free-space optical (FSO) link between a low-Ea…
Simultaneous IM/DD Data Transmission and High-Rate Secret Key Distribution over a Single C-band Channel
Michal Jachura, Jakub Szlachetka, Mateusz Kucharczyk +4
We demonstrate hierarchical multiscale PAM-4 transmission combining 500 Mbps data transfer with optical-layer cryptographic key distribution at rates 24.14 Mbps and 8.38 Mbps secur…
Tx-Rx Mode Mismatch Effects in Gaussian-Modulated CV QKD
Mateusz Kucharczyk, Michal Jachura, Marcin Jarzyna +2
The impact of technical limitations on pulse shaping used to generate a CV QKD signal is quantified in terms of the attainable secure key rate. Optimization of key spectral efficie…
Quantum Pulse Gate Attack on IM/DD Optical Key Distribution Exploiting Symbol Shape Distortion
M. Jarzyna, M. Jachura, K. Banaszek
Intensity modulation/direct detection (IM/DD) optical key distribution (OKD) is a method to generate a secret key whose security against passive eavesdropping is guaranteed by the…
Photon information efficiency limits in deep-space optical communications
M. Jarzyna, L. Kunz, W. Zwolinski +2
Deep-space optical communication links operate under severely limited signal power, approaching the photon-starved regime which requires a receiver capable of measuring individual…
Optimization of intensity-modulation/direct-detection optical key distribution under passive eavesdropping
Konrad Banaszek, Michal Jachura, Piotr Kolenderski +1
We analyze theoretically optimal operation of an optical key distribution (OKD) link based on fine intensity modulation of an optical signal transmitted over an attenuating channel…
Quantum Limits in Optical Communications
Konrad Banaszek, Ludwig Kunz, Michał Jachura +1
This tutorial reviews the Holevo capacity limit as a universal tool to analyze the ultimate transmission rates in a variety of optical communication scenarios, ranging from convent…
Approaching the ultimate capacity limit in deep-space optical communication
Konrad Banaszek, Ludwig Kunz, Marcin Jarzyna +1
The information capacity of an optical channel under power constraints is ultimately limited by the quantum nature of transmitted signals. We discuss currently available and emergi…
Optimizing deep-space optical communication under power constraints
Marcin Jarzyna, Wojciech Zwoliński, Michał Jachura +1
We investigate theoretically the efficiency of deep-space optical communication in the presence of background noise. With decreasing average signal power spectral density, a scalin…
Structured Optical Receivers for Efficient Deep-Space Communication
Konrad Banaszek, Michał Jachura
We discuss conceptual designs for structured optical receivers that can alleviate the requirement for high peak-to-average power ratio in photon-starved optical communication. The…
Quantum fingerprinting using two-photon interference
Michał Jachura, Michał Lipka, Marcin Jarzyna +1
We present a quantum fingerprinting protocol relying on two-photon interference which does not require a shared phase reference between the parties preparing optical signals carryi…
Visibility-based hypothesis testing using higher-order optical interference
Michał Jachura, Marcin Jarzyna, Michał Lipka +2
Many quantum information protocols rely on optical interference to compare datasets with efficiency or security unattainable by classical means. Standard implementations exploit fi…
Measurement of radio-frequency temporal phase modulation using spectral interferometry
Michał Jachura, Jan Szczepanek, Wojciech Wasilewski +1
We present an optical method to measure radio-frequency electro-optic phase modulation profiles by employing spectrum-to-time mapping realized by highly chirped optical pulses. We…
Generation and characterization of discrete spatial entanglement in multimode nonlinear waveguides
Michał Jachura, Michał Karpiński, Konrad Banaszek +3
We analyze theoretically spontaneous parametric down-conversion in a multimode nonlinear waveguide as a source of entangled pairs of spatial qubits, realized as superpositions of a…
Bandwidth manipulation of quantum light by an electro-optic time lens
Michal Karpinski, Michal Jachura, Laura J. Wright +1
The ability to manipulate the spectral-temporal waveform of optical pulses has enabled a wide range of applications from ultrafast spectroscopy to high-speed communications. Extend…
Quantum memory receiver for superadditive communication using binary coherent states
Aleksandra Klimek, Michał Jachura, Wojciech Wasilewski +1
We propose a simple architecture based on multimode quantum memories for collective readout of classical information keyed using a pair coherent states, exemplified by the well-kno…
Scheme for on-chip verification of transverse mode entanglement using the electro-optic effect
Divya Bharadwaj, K. Thyagarajan, Michał Jachura +2
A key ingredient in emerging quantum-enhanced technologies is the ability to coherently manipulate and detect superpositions of basis states. In integrated optics implementations,…
Hologram of a Single Photon
Radosław Chrapkiewicz, Michał Jachura, Konrad Banaszek +1
The spatial structure of single photons is becoming an extensively explored resource used for facilitating the free-space quantum key distribution and quantum computation as well a…
Mode engineering for realistic quantum-enhanced interferometry
Michał Jachura, Radosław Chrapkiewicz, Rafał Demkowicz-Dobrzański +2
Quantum metrology overcomes standard precision limits by exploiting collective quantum superpositions of physical systems used for sensing, with the prominent example of non-classi…
Shot-by-shot imaging of Hong-Ou-Mandel interference with an intensified sCMOS camera
Michał Jachura, Radosław Chrapkiewicz
We report the first observation of Hong-Ou-Mandel (HOM) interference of highly indistinguishable photon pairs with spatial resolution. Direct imaging of two-photon coalescence with…
Bright Integrated Photon-Pair Source for Practical Passive Decoy-State Quantum Key Distribution
Stephan Krapick, Michael Stefszky, Michal Jachura +3
We report on a bright, nondegenerate type-I parametric down-conversion source, which is well suited for passive decoy-state quantum key distribution. We show the photon-number-reso…
High-visibility nonclassical interference of photon pairs generated in a multimode nonlinear waveguide
Michał Jachura, Michał Karpiński, Czesław Radzewicz +1
We report measurements of two-photon interference using a cw-pumped type-II spontaneous parametric down-conversion source based on a multimode perodically poled potassium titanyl p…