A5021131071- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Atomic and Subatomic Physics Research
- Photonic and Optical Devices
- Quantum Computing Algorithms and Architecture
- Distributed systems and fault tolerance
- Satellite Communication Systems
- Education and Technology Integration
- Neuroscience and Neural Engineering
- EEG and Brain-Computer Interfaces
- Random lasers and scattering media
- Blind Source Separation Techniques
- Quantum Mechanics and Applications
- Glass properties and applications
- Molecular Communication and Nanonetworks
- Photonic Crystal and Fiber Optics
- Neural Networks and Reservoir Computing
- Child Development and Digital Technology
- Child Therapy and Development
- Semiconductor Quantum Structures and Devices
- IoT and Edge/Fog Computing
- Semiconductor Lasers and Optical Devices
- Advanced Frequency and Time Standards
University of Calgary
2018-2024
Qazvin Islamic Azad University
2021
Islamic Azad University Islamshahr Branch
2021
Shiraz University
2016
Optical photons are powerful carriers of quantum information, which can be delivered in free space by satellites or fibers on the ground over long distances. Entanglement states distances empower computing, communications, and sensing. Quantum optical memories devices designed to store information form stationary excitations, such as atomic coherence, capable coherently mapping these excitations flying qubits. effectively manipulate states, making them indispensable elements future...
We present the white paper developed during QEYSSat 2.0 study, which was undertaken between June 2021 and March 2022. The study objective to establish a technology road-map for Canada-wide quantum network enabled by satellites. survey state-of-art in communication technologies, identify main applications architectures, review technical readiness levels bottlenecks future mission scenario. report findings of dedicated one-day workshop that included Canadian stakeholders from government,...
We present a quantum repeater scheme that is based on individual erbium and europium ions. Erbium ions are attractive because they emit photons at telecommunication wavelength, while offer exceptional spin coherence for long-term storage. Entanglement between distant created by photon detection. The emission rate of each ion enhanced microcavity with high Purcell factor, as has recently been demonstrated. then transferred to nearby Gate operations performed using dynamically controlled...
We design a quantum repeater architecture using individual $^{167}$Er ions doped into Y$_2$SiO$_5$ crystal. This ion is promising candidate for protocol because of its long hyperfine coherence time in addition to ability emit photons within the telecommunication wavelength range. To distribute entanglement over distance, we propose two different swapping gates between nearby exchange virtual cavity and electric dipole-dipole interaction. analyze their expected performance, discuss strengths...
The T center, a silicon-native spin-photon interface with telecommunication-band optical transitions and long-lived microwave qubits, offers an appealing new platform for both quantum memory microwave-to-optical transduction. A wide range of transduction schemes could be implemented withT center ensembles sufficient depth, advantages disadvantages that depend sensitively on the ensemble properties. In this work we characterize spin to inform device design. We perform first depth measurement...
We propose a quantum repeater architecture that can operate under ambient conditions. Our proposal builds on recent progress towards non-cryogenic spin-photon interfaces based nitrogen-vacancy centers, which have excellent spin coherence times even at room temperature, and optomechanics, allows to avoid phonon-related decoherence also the emitted photons be in telecom band. apply photon number decomposition method quantify fidelity efficiency of entanglement established between two remote...
We analyze and compare three different schemes that can be used to generate entanglement between spin qubits in optically active single solid-state quantum systems. Each scheme is based on first generating the degree of freedom photon number, time bin, or polarization photons emitted by compute evolution generation process decomposing dynamics a Markovian master equation into set propagation superoperators conditioned cumulative detector count. then use conditional density operator solutions...
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...
Efficient transduction devices that reversibly convert optical and microwave quantum signals into each other are essential for integrating different technologies. Rare-earth ions in solids, particular Erbium ions, with both addressable transitions promising candidates designing transducers. We propose a microwave-to-optical transducer scheme based on the dark state protocol $\mathrm{^{167}Er}$ doped yttrium orthosilicate (YSO) at zero external magnetic fields. Zero-field operation is...
Cavity-mediated two-qubit gates, for example between solid-state spins, are attractive quantum network applications. We propose three schemes to implement a controlled phase-flip gate mediated by cavity. The main advantage of all these is the possibility perform them using cavity with high cooperativity, but not in strong-coupling regime. calculate fidelity each scheme detail, taking into account most important realistic imperfections, and compare highlight optimal conditions scheme. Using...
We present the white paper developed during QEYSSat 2.0 study, which was undertaken between June 2021 and March 2022. The study objective to establish a technology road-map for Canada-wide quantum network enabled by satellites. survey state-of-art in communication technologies, identify main applications architectures, review technical readiness levels bottlenecks future mission scenario. report findings of dedicated one-day workshop that included Canadian stakeholders from government,...
Inspired by recent developments in the control and manipulation of quantum dot nuclear spins, which allow for transfer an electron spin state to surrounding nuclear-spin ensemble storage, we propose a repeater scheme that combines individual spins ensembles, serve as spin-photon interfaces memories respectively. We consider use low-strain dots embedded high-cooperativity optical microcavities. Quantum ensembles long-term storage entangled states, heralded entanglement swapping is performed...
We propose a quantum repeater architecture that can operate without cryogenics. Each node in our builds on cell of hot alkali atoms and noble-gas spins offer an hours-long storage time. Such hybrid gases is placed ring cavity, which allows us to suppress the detrimental four-wave-mixing noise system. investigate protocol based single-photon source made ensemble same atoms. A single photon emitted from either stored memory or transmitted central station be detected. quantify fidelity success...
In this paper, we investigate three schemes for implementing Controlled-NOT (CNOT) gates between individual ytterbium (Yb) rare-earth ions doped into yttrium orthovanadate (YVO$_4$ or YVO). Specifically, the CNOT based on magnetic dipolar interactions Yb ions, photon scattering off a cavity, and interference-based protocol, with without an optical cavity. We introduce theoretical framework precise computations of gate infidelity, accounting noise effects. then compute fidelity each scheme to...
Theoretical quantum memory design often involves selectively focusing on certain energy levels to mimic an ideal $\Lambda$-configuration, a common approach that may unintentionally overlook the impact of neighboring or undesired couplings. While this simplification be justified in protocols platforms, it can significantly distort achievable performance. Through numerical semi-classical analysis, we show presence unwanted and couplings NV-center-based absorptive amplify signal, resulting...
We use spectral hole burning to investigate spin dynamics within the electronic Zeeman sublevels of ground state erbium ions in erbium-doped fibers (EDF). Conducted at ultra-low temperatures and under varying magnetic fields, our study reveals distinct changes relaxation across different conditions. identified three decay components approximately 7 mK, with one achieving lifetimes over 9 hours optimal conditions, while two were observed higher temperatures. The fairly stable relative weights...
The T centre, a silicon-native spin-photon interface with telecommunications-band optical transitions and long-lived microwave qubits, offers an appealing new platform for both quantum memory to telecommunications band transduction. A wide range of transduction schemes could be implemented on such platform, advantages disadvantages that depend sensitively the ensemble properties. In this work we characterize centre spin ensembles inform device design. We perform first depth measurement...
In recent years, the use of Brain Computer Interface (BCI) systems has become more popular due to rehabilitation applications, easy installation, cheapness, and so forth. Systems can receive brain signals input them into a computer. These then be analysed. An important feature BCI is that they have ability help people with disabilities or special needs, these system control external devices computer applications. presented paper, we used BCI-SSVEP-Training dataset OpenVibe open-source...
We propose a quantum repeater architecture that can operate under ambient conditions. Our proposal builds on recent progress towards non-cryogenic spin-photon interfaces based nitrogen-vacancy centers, which have excellent spin coherence times even at room temperature, and optomechanics, allows to avoid phonon-related decoherence also the emitted photons be in telecom band. apply photon number decomposition method quantify fidelity efficiency of entanglement established between two remote...
We propose a quantum repeater architecture that can operate without cryogenics. Each node in our builds on cell of hot alkali atoms and noble-gas spins which offer storage time as long few hours. Such hybrid gases is placed ring cavity, allows us to suppress the detrimental four-wave mixing (FWM) noise system. investigate protocol based single-photon source made an ensemble same atoms. A single photon emitted from either stored memory or transmitted central station be detected. quantify...
We report an investigation of the optical feedback effect on dynamics a tunnelling-injection quantum dot (TI QD) semiconductor laser. Assuming external cavity to be short and using small signal analysis, modulation response TI QD laser is calculated under conditions. The impact tunnelling probability, bias-current density, ratio, length linewidth enhancement factor studied. With taken into account, responses conventional lasers are compared. obtained results demonstrate that at appropriate...
Optical photons are powerful carriers of quantum information, which can be delivered in free space by satellites or fibers on the ground over long distances. Entanglement states distances empower computing, communications, and sensing. Quantum optical memories effectively store manipulate states, makes them indispensable elements future long-distance networks. Over past two decades, with high fidelity, efficiencies, storage times, promising multiplexing capabilities have been developed,...