- 标题
- 摘要
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- 实验方案
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Machine Learning Applied to Quantum Synchronization-Assisted Probing
摘要： A probing scheme is considered with an accessible and controllable qubit, used to probe an out-of equilibrium system consisting of a second qubit interacting with an environment. Quantum spontaneous synchronization between the probe and the system emerges in this model and, by tuning the probe frequency, can occur both in-phase and in anti-phase. The capability of machine learning in this probing scheme is analyzed based on quantum synchronization. An artificial neural network is used to infer, from a probe observable, main dissipation features, such as the environment Ohmicity index. The efficiency of the algorithm in the presence of some noise in the dataset is also considered. It is shown that the performance in either classification and regression is significantly improved due to the in/anti-phase synchronization transition. This opens the way to the characterization of environments with arbitrary spectral densities.
关键词： quantum synchronization,quantum probing,machine learning
更新于2025-09-23 15:23:52
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The impact of out of band emissions: A measurement based performance comparison of UF-OFDM and CP-OFDM
摘要： Long Term Evolution (LTE) networks, along with their recent releases, rely on the cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform as the foundation. However, high sidelobes, synchronization problems and spectral efficiency constraints of CP-OFDM cannot meet future requirements of cellular network design targets. At this point, universal filtered orthogonal frequency division multiplexing (UF-OFDM) emerges as a strong candidate. Equipped with the advantages of using filters, UF-OFDM provides additional design flexibility to address the fundamental problems of CP-OFDM. In this study, the effect of adjacent channels that causes interference between different frequency channels because of out-of-band (OoB) emissions on UF-OFDM performance is investigated by performing real-time tests on software defined radio (SDR) nodes with multiple reception paths. Frequency domain carrier frequency offset (CFO) and symbol timing offset (STO) correction techniques are used. By the application of the same correction approaches to CP-OFDM, these two waveforms are evaluated in terms of signal to noise ratio (SNR), bit/symbol error rate (BER/SER) and error vector magnitude (EVM). Test results indicate that, based on lower OoB emissions, UF-OFDM uses the spectrum more efficiently and provides better results than CP-OFDM in congested environments.
关键词： synchronization,CP-OFDM,out-of-band emissions,software defined radio nodes,UF-OFDM
更新于2025-09-23 15:23:52
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[ACM Press the 14th IEEE/ACM International Symposium - Athens, Greece (2018.07.17-2018.07.19)] Proceedings of the 14th IEEE/ACM International Symposium on Nanoscale Architectures - NANOARCH '18 - Signal Synchronization in Large Scale Quantum-dot Cellular Automata Circuits
摘要： Quantum-dot fabrication is a well-established nanotechnology, which have many applications in many different scientific fields. By placing four quantum-dots on the corners of a square, a cell is formed, in which the digital information can be stored. This cell serves as the structural device of Quantum-dot Cellular Automata (QCA) circuits. After QCA presentation, several digital circuits and systems have been designed and proposed in the literature. However, one of the biggest problems QCA designers have to face to pave the successful design of functional and large scale QCA circuits is signal synchronization. In this paper, a novel approach of the aforementioned problem is presented. This approach is inspired by the well known computational problem of Firing Squad Synchronization (FSS). FSS problem has many similarities with large scale QCA circuits synchronization problem. In addition, FSS problem has been studied by many researchers and many efficient solutions have been proposed in the literature.
关键词： Synchronization,Firing Squad Synchronization problem,Quantum-dot Cellular Automata (QCA),Large Scale Circuits,Nanoelectronics
更新于2025-09-23 15:22:29
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[IEEE 2018 14th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT) - Qingdao, China (2018.10.31-2018.11.3)] 2018 14th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT) - Design of a GNSS Signal Synchronization Chip
摘要： The 1PPS timing signal sent by GNSS has high precision and stability, so it can be used as a reference signal for a variety of purposes. This GNSS signal synchronization chip can synchronize the locally produced second cycle signal with 1PPS signal, which includes a hierarchical Time-to-Digital Converter (TDC) and a two-stage phase-shifting unit. The chip is implemented in 0.18μm 1P6M CMOS technology, and power voltage of core is 1.8V and normal operating temperature range is from -40°C to 125°C.Test results show the dynamic power current at work is about 4mA, while the static power current at low power consumption is about 32μA. The minimum time resolution is about 1ns.
关键词： TDC,GNSS signal synchronization,phase-shifting
更新于2025-09-23 15:22:29
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synchronization in a coupled optomechanical system with periodic modulation
摘要： Based on the concepts of quantum synchronization and quantum phase synchronization proposed by A. Mari et al. [Phys. Rev. Lett. 111, 103605 (2013)], we introduce and characterize the measure of a more generalized quantum synchronization called quantum φ synchronization under which pairs of variables have the same amplitude and possess the same φ phase shift. Naturally, quantum synchronization and quantum antisynchronization become special cases of quantum φ synchronization. Their relations and differences are also discussed. To illustrate these theories, we investigate the quantum φ synchronization and quantum phase synchronization phenomena of two coupled optomechanical systems with periodic modulation and show that quantum φ synchronization is more general as a measure of synchronization. We also show the phenomenon of quantum antisynchronization when φ = π.
关键词： quantum phase synchronization,optomechanical systems,periodic modulation,quantum synchronization,quantum φ synchronization
更新于2025-09-23 15:21:01
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[IEEE 2018 International Conference on Information and Telecommunication Technologies and Radio Electronics (UkrMiCo) - Odessa, Ukraine (2018.9.10-2018.9.14)] 2018 International Conference on Information and Telecommunication Technologies and Radio Electronics (UkrMiCo) - Spatial-Energy Characteristics of Focused Modes of Metallic Terahertz Laser Resonator
摘要： Cellular networks are currently experiencing a tremendous growth of data traffic. To cope with this demand, a close cooperation between academic researchers and industry/standardization experts is necessary, which hardly exists in practice. In this paper, we try to bridge this gap between researchers and engineers by providing a review of current standard-related research efforts in wireless communication systems. Furthermore, we give an overview about our attempt in facilitating the exchange of information and results between researchers and engineers, via a common simulation platform for 3GPP long term evolution (LTE) and a corresponding webforum for discussion. Often, especially in signal processing, reproducing results of other researcher is a tedious task, because assumptions and parameters are not clearly specified, which hamper the consideration of the state-of-the-art research in the standardization process. Also, practical constraints, impairments imposed by technological restrictions and well-known physical phenomena, e.g., signaling overhead, synchronization issues, channel fading, are often disregarded by researchers, because of simplicity and mathematical tractability. Hence, evaluating the relevance of research results under practical conditions is often difficult. To circumvent these problems, we developed a standard-compliant open-source simulation platform for LTE that enables reproducible research in a well-defined environment. We demonstrate that innovative research under the confined framework of a real-world standard is possible, sometimes even encouraged. With examples of our research work, we investigate on the potential of several important research areas under typical practical conditions, and highlight consistencies as well as differences between theory and practice.
关键词： MIMO,pilot power allocation,LTE,Heterogeneous networks,distributed antenna systems,reproducible research,frequency synchronization,multiuser gains
更新于2025-09-23 15:21:01
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Adaptive Synchronization of Fractional-Order Coupled Neurons Under Electromagnetic Radiation
摘要： In this paper, we investigate the dynamical characteristics of four-variable fractional-order Hindmarsh–Rose neuronal model under electromagnetic radiation. The numerical results show that the improved model exhibits more complex dynamical behavior with more bifurcation parameters. Meanwhile, based on the fractional-order Lyapunov stability theory, we propose two adaptive control methods with a single controller to realize chaotic synchronization between two coupled neurons. Finally, numerical simulations show the feasibility and effectiveness of the presented method.
关键词： fractional-order,neuron,adaptive control,synchronization,Electromagnetic radiation
更新于2025-09-23 15:21:01
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Clocks without a??Timea?? in Entangled-State Experiments
摘要： Entangled states of light exhibit measurable correlations between light detections at separated locations. These correlations are exploited in entangled-state quantum key distribution. To do so involves setting up and maintaining a rhythm of communication among clocks at separated locations. Here, we try to disentangle our thinking about clocks as used in actual experiments from theories of time, such as special relativity or general relativity, which already differ between each other. Special relativity intertwines the concept of time with a particular de?nition of the synchronization of clocks, which precludes synchronizing every clock to every other clock. General relativity imposes additional barriers to synchronization, barriers that invite seeking an alternative depending on any global concept of time. To this end, we focus on how clocks are actually used in some experimental situations. We show how working with clocks without worrying about time makes it possible to generalize some designs for quantum key distribution and also clari?es the need for alternatives to the special-relativistic de?nition of synchronization.
关键词： agent,entangled light states,unpredictability,synchronization
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE International Symposium on Precision Clock Synchronization for Measurement,Control, and Communication (ISPCS) - Geneva, Switzerland (2018.9.30-2018.10.5)] 2018 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) - Impact of network component temperature variation on long haul White Rabbit links
摘要： This paper shows an analysis of the time offset error introduced into a highly accurate packet-based time synchronization link by the most frequently deployed long distance network components. Translating the sub-nanosecond accuracy of a White Rabbit timing link into long distance fiber communication networks is a very demanding task. With the increased distance the need for devices that keep the integrity of the signal and maintain its power across hundreds of kilometers is beyond question. Some of these devices might suffer from large disparities in their environmental conditions due to being placed in distant locations from each other, potentially varying their behavior. The results demonstrate that moderate temperature disparities can lead to timing offset errors of several nanoseconds. This outcome can be seen as the foundation laid for a series of compensation techniques to be developed in future work.
关键词： white rabbit,fiber-optic,temperature,time synchronization,long distance
更新于2025-09-23 15:21:01
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Encrypted Chaos in Quantum Dot Light Emitting Diode
摘要： A communication scheme based on the synchronization of two chaotic quantum dot light emitting diodes (QD-LEDs) is theoretically examined. The Chaos in the QD-LED is generated by means of an optical feedback. Synchronization of the chaos is achieved by varying coupling strength between the transmitter and the receiver as unidirectional coupling. The proposed communication schemes is test a by successfully transmitting messages.
关键词： chaos synchronization,optical feedback,QD-LED,communication
更新于2025-09-23 15:19:57