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Photon transport in bimodal atom-cavity systems with waveguide coupling: Application to deterministic photon subtraction

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Physical Review Research 2025年第1期7卷 013018-013018页

作者： Abdolreza Pasharavesh Michal Bajcsy Institute for Quantum Computing University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo Ontario N2L 3G1 Canada

The single-photon Raman interaction has emerged as a promising tool for deterministic photon subtraction, acting as a photon-activated switch in which the first arriving photon renders the system transparent to subsequent photons. Here, we employ the input-output formalism to perform a single-photon transport analysis within a photon subtractor consisting of a three-level quantum emitter coupled to a bimodal cavity-waveguide system. The analysis provides the frequency response of the system and reveals how it is affected by the key physical parameters of the cavity modes, such as coupling strengths and decay rates. We utilize these results to calculate the probability of successful photon subtraction from pulses of different temporal shapes, durations, and carrier frequencies. Subsequent analysis combines the input-output formalism with the quantum trajectory method to numerically verify the analytical findings as well as to assess the impact of photon number of the input pulse on the subtractor's performance. Our findings highlight the single-photon model's capability in predicting the system's response to multiphoton inputs in the pulsed regime as well as its potential utility in the design of efficient single-photon subtractors.

关键词： Waveguides

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Experimental implementation of an efficient test of quantumness

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Physical Review A 2024年第1期109卷 012610-012610页

作者： Laura Lewis Daiwei Zhu Alexandru Gheorghiu Crystal Noel Or Katz Bahaa Harraz Qingfeng Wang Andrew Risinger Lei Feng Debopriyo Biswas Laird Egan Thomas Vidick Marko Cetina Christopher Monroe Institute for Quantum Information and Matter and Department of Computing and Mathematical Sciences California Institute of Technology Pasadena California 91125 USA Division of Physics Mathematics and Astronomy California Institute of Technology Pasadena California 91125 USA Joint Quantum Institute Departments of Physics and Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Joint Center for Quantum Information and Computer Science NIST/University of Maryland College Park Maryland 20742 USA IonQ Inc. College Park Maryland 20740 USA Departments of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Institute for Theoretical Studies ETH Zürich Zürich CH 8001 Switzerland Duke Quantum Center and Department of Physics Duke University Durham North Carolina 27708 USA Department of Electrical and Computer Engineering Duke University Durham North Carolina 27708 USA Chemical Physics Program and Institute for Physical Science and Technology University of Maryland College Park Maryland 20742 USA

A test of quantumness is a protocol where a classical user issues challenges to a quantum device to determine if it exhibits nonclassical behavior, under certain cryptographic assumptions. Recent attempts to implement such tests on current quantum computers rely on either interactive challenges with efficient verification or noninteractive challenges with inefficient (exponential time) verification. In this paper, we execute an efficient noninteractive test of quantumness on an ion-trap quantum computer. Our results significantly exceed the bound for a classical device's success.

关键词： quantum cryptography quantum information with trapped ions quantum protocols quantum verification

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Analytical quantum Full-Wave Solution of Transmon Qubits in a 3D Waveguide Cavity

Analytical Quantum Full-Wave Solution of Transmon Qubits in ...

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USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)

作者： Soomin Moon Thomas E. Roth Elmore Family School of Electrical and Computer Engineering Purdue University Indiana USA Purdue Quantum Science and Engineering Institute Purdue University Indiana USA

ISBN: (数字)9789463968119

ISBN: (纸本)9798350359497

Circuit quantum electrodynamics (cQED) is one of the most promising platforms for building quantum information processors. As quantum technology evolves the hardware is becoming increasingly complex, so there is a need for a general-purpose, high-fidelity numerical modeling method for an accurate analysis. However, there is a lack of analytical solutions that can serve as a validation method to support the development of efficient and accurate numerical models in this new field. In this study, we develop an analytical solution using microwave cavity perturbation and antenna theories within a field-based description of cQED devices (T. E. Roth and W. C. Chew, “Macroscopic circuit quantum electrodynamics: A new look toward developing full-wave numerical models,” IEEE Journal on Multiscale and Multiphysics Computational Techniques, vol. 6, pp. 109-124, 2021). The system analyzed corresponds to one or two transmon qubits inside a rectangular waveguide cavity, where the transmons are formed by connecting a Josephson junction across the terminals of a small dipole antenna. We validate our analytical solution against our same formalism evaluated with numerical eigenmodes, the energy participation ratio quantization approach (Z. K. Minev, Z. Leghtas, S. O. Mundhada, L. Christakis, I. M. Pop, and M. H. Devoret, “Energy-participation quantization of Josephson circuits,” npj quantum Information, vol. 7, no. 1, pp. 1–11, 2021), and an impedance-based method (Solgun, Firat, David P. DiVincenzo, and Jay M. Gambetta. “Simple impedance response formulas for the dispersive interaction rates in the effective Hamiltonians of low anharmonicity superconducting qubits.” IEEE Transactions on Microwave Theory and Techniques, vol. 67, no. 3, pp. 928–948, 2019).

关键词： Microwave antennas Electrodynamics Quantization (signal) Accuracy Qubit Waveguide junctions Microwave theory and techniques

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Calculating Multi-Qubit Exchange Coupling Rates for Transmon Qubits Using a Field-Based Formalism

Calculating Multi-Qubit Exchange Coupling Rates for Transmon...

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US National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)

作者： Ghazi Khan Thomas E. Roth Elmore Family School of Electrical and Computer Engineering Purdue University Indiana USA Purdue Quantum Science and Engineering Institute Purdue University Indiana USA

Superconducting qubits are one of the most mature approaches to realize quantum computers. However, to meet the stringent performance requirements, these systems are becoming increasingly complex. To help solve this engineering problem, high-fidelity numerical methods are becoming a key resource. Unfortunately, existing approaches use full-wave computational electromagnetics (CEM) methods in inefficient ways that become impractical if even a few qubits are considered. Here, we derive a simple formula that can be efficiently evaluated using typical full-wave CEM tools to numerically calculate the exchange coupling rate between multiple transmons; which is a key system parameter involved in the design of multi-qubit entangling gates in modern quantum processors. Our approach is applicable to the common case of transmons operating in the dispersive regime where the operating frequency of the electromagnetic (EM) resonator is far detuned from the transition frequencies of the qubits coupled to it. We start from our field-theory description of these systems (T. E. Roth and W. C. Chew, “Macroscopic circuit quantum electrodynamics: A new look toward developing full-wave numerical models,” IEEE Journal on Multiscale and Multiphysics Computational Techniques, Vol. 6, 109-124,2021) with multiple qubits and perform a Schrieffer-Wolf transform to rewrite the system Hamiltonian into the dispersive regime. This re-expresses the indirect qubit-field coupling of the original Hamiltonian as direct qubit-qubit interactions with an exchange coupling rate that depends on properties of the EM system the qubits are embedded in. From here, typical field-theory techniques can be used to relate this exchange coupling rate to the EM Green's function, which can further be related to the impedance matrix between the qubits. This quantity can be efficiently computed with standard full-wave CEM tools, which is in contrast to prevailing approaches that rely on performing EM eigenmode decompositio

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The Multiple- Access Channel with Entangled and Conferencing Transmitters

The Multiple- Access Channel with Entangled and Conferencing...

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2023 IEEE Globecom Workshops, GC Wkshps 2023

作者： Pereg, Uzi Deppe, Christian Boche, Holger Faculty of Electrical and Computer Engineering Technion - Israel Institute of Technology Israel Helen Diller Quantum Center Technion Israel Institute for Comm. Engineering Technical University of Munich Germany 6G-life Mqv Germany 6G-life Casa Mcqst Mqv Germany

ISBN: (纸本)9798350370218

Communication over a multiple-access channel (MAC) with entanglement assisted and conferencing transmitters is considered, where the transmitters can also communicate with each other over rate-limited links. We fully characterize the capacity region for the MAC with entangled transmitters and classical conferencing. We also introduce a quantum conferencing protocol. For the MAC with entangled transmitters and quantum conferencing, we determine a achievable region. This region is generally larger than the capacity region for the MAC with entangled transmitters and classical conferencing. Using superdense coding, entanglement can double the conferencing rate. We continue to discuss potential applications of cooperation between the transmitters for the future 6G system. This is only a short abstract. The long version with all proofs can be found on arxiv [l ], © 2023 IEEE.

关键词： conferencing encoders entanglement resources multiple-access channel quantum communication

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IoT-Based Car Safety System With Airbag Notification for Emergency Assistance 2

IoT-Based Car Safety System With Airbag Notification for Eme...

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2nd International Conference on Smart Technologies for Smart Nation, SmartTechCon 2023

作者： Ramalingam, L. Muthumarilakshmi, S. Venkatesh, M. Jambulingam, Umamagewaran Malathi, N. School of Computer Science and Engineering Sriram Engineering College Perumalpattu Tamil Nadu Chennai India Department of Computer Science and Engineering S.A. Engineering College Tamil Nadu Chennai India Department of Electrical and Electronics Engineering Madanapalle Institute of Technology & Science Andhra Pradesh Madanapalle India Department of Networking and Communications School of Computing College of Engineering and Technology SRM Institute of Science and Technology Tamil Nadu Kattankulathur India Department of Computer Science and Engineering Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Saveetha University Tamil Nadu Chennai India

ISBN: (纸本)9798350305418

The development of Internet of Things (IoT) technology has provided the potential for creative uses in many fields, including car safety systems. This research presents an IoT-based automotive safety system that intends to improve the safety of passengers during accidents by providing quick airbag deployment notification and assistance in an emergency. The system uses a network of in-car communication modules, actuators, and sensors. These sensors continually monitor several parameters, including impact intensity, deceleration, and acceleration. The technology senses the force of a collision and activates the airbags, significantly lowering the potential for serious injury. Additionally, the IoT-based system instantly notifies emergency response agencies of the collision, including the vehicle's position, the collision's severity, and if it is occupants. This makes it possible for first responders to respond swiftly and provide the occupants with quick assistance. The technology uses Wi-Fi communication protocols to send data between the car and emergency response services, ensuring a reliable and real-time connection. The collected data is securely transmitted and stored on a cloud-based platform, enabling effective analysis and historical accident tracking. Reduced response times, increased occupant safety, and better accident data collecting for further research and preventive measures are just several advantages of the proposed IoT-based automobile safety system with airbag notification for emergency help. IoT technology in automobile safety systems brings new benefits for enhancing general road safety and emergency response capabilities. © 2023 IEEE.

关键词： Airbag deployment Airbag notification Car safety system Internet of Things Sensors

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Implementation of Inhomogeneous Broadening in Time-Domain Dispersive Maxwell Solvers

Implementation of Inhomogeneous Broadening in Time-Domain Di...

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International Review of Progress in Applied Computational Electromagnetics (ACES)

作者： Ludmila J. Prokopeva Advika Vidhyadhiraja Alexander V. Kildishev Elmore Family School of Electrical and Computer Engineering Birck Nanotechnology Center and Purdue Quantum Science and Engineering Institute Purdue University West Lafayette IN USA

ISBN: (数字)9781733509671

ISBN: (纸本)9798350362978

We present a general approach for implementing inhomogeneous broadening (time-dependent decay) in time do-main (TD) dispersive Maxwell solvers. The classical idealized Lorentz, Drude, and Debye models are extended to Gauss-Lorentz, Gauss-Drude, and Gauss-Debye models, respectively. The efficient TD implementation is developed employing mini-max optimized semi-analytical approximation (MiMOSA). It is rigorously tested for all models and experimental data with an in-house FDTD solver and commercial FDTD software.

关键词： Computational modeling Nonhomogeneous media Minimization Software Data models Time-domain analysis Dispersion

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Derandomization of quantum algorithm for triangle finding

arXiv

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arXiv 2023年

作者： Li, Guanzhong Li, Lvzhou Institute of Quantum Computing and Software School of Computer Science and Engineering Sun Yat-sen University Guangzhou510006 China

Derandomization is the process of taking a randomized algorithm and turning it into a deterministic algorithm, which has attracted great attention in classical computing. In quantum computing, it is challenging and intriguing to derandomize quantum algorithms, due to the inherent randomness of quantum mechanics. The significance of derandomizing quantum algorithms lies not only in theoretically proving that the success probability can essentially be 1 without sacrificing quantum speedups, but also in experimentally improving the success rate when the algorithm is implemented on a real quantum computer. In this paper, we focus on derandomizing quanmtum algorithms for the triangle sum problem (including the famous triangle finding problem as a special case), which asks to find a triangle in an edge-weighted graph with n vertices, such that its edges sum up to a given weight. We show that when the graph is promised to contain at most one target triangle, there exists a deterministic quantum algorithm that either finds the triangle if it exists or outputs "no triangle" if none exists. It makes O(n9/7) queries to the edge weight matrix oracle, and thus has the same complexity with the state-of-art bounded-error quantum algorithm. To achieve this derandomization, we make full use several techniques: nested quantum walks with quantum data structure, deterministic quantum search with adjustable parameters, and dimensional reduction of quantum walk search on Johnson graph. © 2023, CC BY.

关键词： quantum theory

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Towards an Analytical quantum Full-Wave Solution of a Transmon Qubit in a 3D Microwave Cavity

Towards an Analytical Quantum Full-Wave Solution of a Transm...

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US National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)

Circuit quantum electrodynamics (cQED) is one of the most promising platforms for building quantum information processors. As quantum technology evolves the hardware is becoming increasingly complex, so there is a need for a general-purpose, high-fidelity numerical modeling method for an accurate analysis. However, there is a lack of analytical solutions that can serve as a validation method to support the development of efficient and accurate numerical models in this new field. In this study, we develop an analytical solution using microwave cavity perturbation and antenna theories within a field-based description of cQED devices (T. E. Roth and W. C. Chew, “Macroscopic circuit quantum electrodynamics: A new look toward developing full-wave numerical models,” IEEE Journal on Multiscale and Multiphysics Computational Techniques, Vol. 6, 109–124, 2021). The system analyzed corresponds to a transmon inside a rectangular waveguide cavity, where the transmon is formed by connecting a Josephson junction across the terminals of a small dipole antenna. We validate our analytical solution against our same formalism evaluated with numerical eigenmodes and the energy participation ratio quantization approach (Z. K. Minev, Z. Leghtas, S. O. Mundhada, L. Christakis, I. M. Pop, and M. H. Devoret, “Energy-participation quantization of Josephson circuits,” npj quantum Information, Vol. 7, No.1, 1-11,2021).

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Advancing Vascular Dementia Diagnosis Through Salp Swarm Optimized Convolutional Neural Network 8

Advancing Vascular Dementia Diagnosis Through Salp Swarm Opt...

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8th IEEE International Conference on Computational System and Information Technology for Sustainable Solutions, CSITSS 2024

作者： Mathkunti, Nivedita Manohara Ananthanagu, U. Abdulpur, Vidya N. Mangaiyarkarasi, D. Anitha, S. Alliance School of Advanced Computing Alliance Univerisity Department of Computer Science & Engineering Karnataka Bengaluru India Dr.D.Y Patil Pratishthan's College of Engineering Department of Electrical Engineering Maharastra Kolhapur India Institute of Science and Technology Avadi India Department of Artificial Intelligence & Machine Learning Karnataka Bengaluru562106 India

ISBN: (纸本)9798331505462

Vascular Dementia (VD) is a form of cognitive impairment seen in individuals, restricting from problems with blood vessels supplying the brain. These issues lead to strokes or reduced blood flow and gradually lead to the development of vascular dementia. Since it tends to progress slowly, diagnosis often comes after significant brain damage making prevention is crucial. Early identification of risk factors are vital to mitigate the risk of irreversible cognitive decline associated with vascular dementia. Accordingly, this research proposes an optimized neural network model for predicting vascular dementia at its earlier to improve the quality of life. The initial stage in this research involves preprocessing, where the input data is cleaned and normalized. These steps ensure that the vascular dementia dataset is cleaned of inconsistencies and prepared with normalized features for accurate analysis and modeling. Following preprocessing, relevant data features are selected using the chi-square approach, making the classification task easier. Finally, classification is performed utilizing a Convolutional Neural Network (CNN) and for fine-tuning of CNN parameters Salp Swarm Optimization (SSO) Algorithm is implemented. The execution of proposed work is processed using Python software and the outcome reveals superior performance in terms of accuracy and precision. Thereby the proposed method provides better performance with an accuracy of 94.5%, contrasted to existing methods in predicting VD. © 2024 IEEE.

关键词： Convolutional neural networks

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