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Optimizing resource allocation in flex-grid entanglement distribution networks

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Optimizing resource allocation in flex-grid entanglement dis...

2022 IEEE Photonics Conference, IPC 2022

作者： Alnas, Jude Alshowkan, Muneer Nageswara Rao, S.V. Peters, Nicholas A. Lukens, Joseph M. University of Alabama Department of Electrical and Computer Engineering TuscaloosaAL35401 United States Quantum Information Science Section Oak Ridge National Laboratory Oak RidgeTN37831 United States Advanced Computing Methods Section Oak Ridge National Laboratory Oak RidgeTN37831 United States

We introduce a model for the distribution of frequency-polarization hyper-entangled photon pairs in a flexible-grid optical network. In order to optimize entanglement fidelity and entangled bit rate, we apply a geneti... 详细信息

ISBN: (数字)9781665434874

ISBN: (纸本)9781665434874

关键词： Genetic algorithms

Coexistent quantum channel characterization using quantum process tomography with spectrally resolved detection 3

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Coexistent quantum channel characterization using quantum pr...

Quantum computing, Communication, and Simulation III 2023

作者： Chapman, Joseph C. Lukens, Joseph M. Alshowkan, Muneer Rao, Nageswara S.V. Kirby, Brian T. Peters, Nicholas A. Quantum Information Science Section Oak Ridge National Laboratory Oak RidgeTN37831 United States Research Technology Office Arizona State University TempeAZ85287 United States Advanced Computing Methods for Engineered Systems Section Oak Ridge National Laboratory Oak RidgeTN37831 United States Tulane University New OrleansLA70118 United States DEVCOM Army Research Laboratory AdelphiMD20783 United States

ISBN: (纸本)9781510659971

The coexistence of classical and quantum signals over the same optical fiber is critical for quantum networks operating within the existing communications infrastructure. Here, we characterize the quantum channel that results from distributing approximate single-photon polarization-encoded qubits simultaneously with classical light of varying intensities through a 25 km fiber-optic channel. We use spectrally resolved quantum process tomography with a newly developed Bayesian reconstruction method to estimate the quantum channel from experimental data, both with and without classical noise. Furthermore, we show that the coexistent fiber-based quantum channel has high process fidelity with an ideal depolarizing channel if the noise is dominated by Raman scattering. These results aid future development of quantum repeater designs and quantum error-correcting codes which benefit from realistic channel error models. © 2023 SPIE.

关键词： Tomography

Two-mode squeezing over deployed fiber coexisting with conventional communications

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arXiv 2023年

Squeezed light is a crucial resource for continuous-variable (CV) quantum information science. Distributed multi-mode squeezing is critical for enabling CV quantum networks and distributed quantum sensing. To date, multi-mode squeezing measured by homodyne detection has been limited to single-room experiments without coexisting classical signals, i.e., on "dark" fiber. Here, after distribution through separate fiber spools (5 km), −0.9±0.1-dB coexistent two-mode squeezing is measured. Moreover, after distribution through separate deployed campus fibers (about 250 m and 1.2 km), −0.5 ± 0.1-dB coexistent two-mode squeezing is measured. Prior to distribution, the squeezed modes are each frequency multiplexed with several classical signals-including the local oscillator and conventional network signals-demonstrating that the squeezed modes do not need dedicated dark fiber. After distribution, joint two-mode squeezing is measured and recorded for post-processing using triggered homodyne detection in separate locations. This demonstration enables future applications in quantum networks and quantum sensing that rely on distributed multi-mode squeezing. Copyright © 2023, The Authors. All rights reserved.

关键词： Fibers

Difficulty with Dental Caries among Adolescents Who Are Underweight: A Nationwide Study

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Journal of Pediatrics: Clinical Practice

Journal of Pediatrics: Clinical Practice 2024年 14卷 200136-200136页

作者： Bhoopathi, Vinodh Ortega-Verdugo, Paula Wells, Christine Liu, Honghu Section of Public and Population Health University of California at Los Angeles School of Dentistry Los Angeles CA United States Statistical Methods and Data Analytics University of California at Los Angeles Office of Advanced Research Computing Los Angeles CA United States

This study highlights a unique association between weight status and difficulty with dental caries among US adolescents. Being underweight was significantly associated with dental caries in adolescents aged 10-17. ... 详细信息

关键词： NSCH National Survey of Children's Health BMI Body mass index FPL Federal poverty level

Coexistent Quantum Channel Characterization Using Spectrally Resolved Bayesian Quantum Process Tomography

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Physical Review Applied 2023年第4期19卷 044026-044026页

作者： Joseph C. Chapman Joseph M. Lukens Muneer Alshowkan Nageswara Rao Brian T. Kirby Nicholas A. Peters Quantum Information Science Section Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Research Technology Office Arizona State University Tempe Arizona 85287 USA Advanced Computing Methods for Engineered Systems Section Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Tulane University New Orleans Louisiana 70118 USA DEVCOM Army Research Laboratory Adelphi Maryland 20783 USA

The coexistence of quantum and classical signals over the same optical fiber with minimal degradation of the transmitted quantum information is critical for operating large-scale quantum networks over the existing communications infrastructure. Here, we systematically characterize the quantum channel that results from simultaneously distributing approximate single-photon polarization-encoded qubits and classical light of varying intensities through fiber-optic channels of up to 15 km. Using spectrally resolved quantum process tomography with a Bayesian reconstruction method that we develop, we estimate the full quantum channel from experimental photon counting data, both with and without classical background. Furthermore, although we find the exact channel description to be a weak function of the pump polarization, we nevertheless show that the coexistent fiber-based quantum channel has high process fidelity with an ideal depolarizing channel when the noise is dominated by Raman scattering. These results provide a basis for the future development of quantum repeater designs and quantum error-correcting codes for real-world channels and inform models used in the analysis and simulation of quantum networks.

关键词： Engineering Quantum channels Quantum communication Quantum error correction Quantum networks Quantum repeaters Quantum tomography Communication networks

Long-term cybersecurity applications enabled by quantum networks

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arXiv 2023年

作者： Peters, Nicholas A. Alshowkan, Muneer Chapman, Joseph C. Pooser, Raphael C. Rao, Nageswara S.V. Newell, Raymond T. Quantum Information Science Section Oak Ridge National Laboratory Oak RidgeTN37831 United States Advanced Computing Methods for Engineered Systems Section Oak Ridge National Laboratory Oak RidgeTN37831 United States MPA-Quantum Los Alamos National Laboratory Los AlamosNM87545 United States

If continental-scale quantum networks are realized, they will provide the resources needed to fulfill the potential for dramatic advances in cybersecurity through quantum-enabled cryptography applications. We describe recent progress and where the US is headed as well as argue that we go one step further and jointly develop quantum and conventional cryptography methods for joint deployments along the quantum backbone infrastructure. Copyright © 2023, The Authors. All rights reserved.

关键词： Quantum cryptography

Optimal resource allocation for flexible-grid entanglement distribution networks

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arXiv 2022年

作者： Alnas, Jude Alshowkan, Muneer Rao, Nageswara S.V. Peters, Nicholas A. Lukens, Joseph M. Department of Electrical and Computer Engineering University of Alabama 245 7th Avenue TuscaloosaAL35406 United States Quantum Information Science Section Oak Ridge National Laboratory Oak RidgeTN37831 United States Advanced Computing Methods Section Oak Ridge National Laboratory Oak RidgeTN37831 United States

We use a genetic algorithm (GA) as a design aid for determining the optimal provisioning of entangled photon spectrum in flex-grid quantum networks with arbitrary numbers of channels and users. After introducing a general model for entanglement distribution based on frequency-polarization hyperentangled biphotons, we derive upper bounds on fidelity and entangled bit rate for networks comprising one-to-one user connections. Simple conditions based on user detector quality and link efficiencies are found that determine whether entanglement is possible. We successfully apply a GA to find optimal resource allocations in four different representative network scenarios and validate features of our model experimentally in a quantum local area network in deployed fiber. Our results show promise for the rapid design of large-scale entanglement distribution networks. Copyright © 2022, The Authors. All rights reserved.

关键词： Genetic algorithms

Coexistent quantum channel characterization using spectrally resolved Bayesian quantum process tomography

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arXiv 2022年

作者： Chapman, Joseph C. Lukens, Joseph M. Alshowkan, Muneer Rao, Nageswara Kirby, Brian T. Peters, Nicholas A. Quantum Information Science Section Oak Ridge National Laboratory Oak RidgeTN37831 United States Research Technology Office Arizona State University TempeAZ85287 United States Advanced Computing Methods for Engineered Systems Section Oak Ridge National Laboratory Oak RidgeTN37831 United States Tulane University New OrleansLA70118 United States DEVCOM Army Research Laboratory AdelphiMD20783 United States

The coexistence of quantum and classical signals over the same optical fiber with minimal degradation of the transmitted quantum information is critical for operating large-scale quantum networks over the existing communications infrastructure. Here, we systematically characterize the quantum channel that results from simultaneously distributing approximate single-photon polarization-encoded qubits and classical light of varying intensities through fiber-optic channels of up to 15 km. Using spectrally resolved quantum process tomography with a Bayesian reconstruction method we developed, we estimate the full quantum channel from experimental photon counting data, both with and without classical background. Furthermore, although we find the exact channel description to be a weak function of the pump polarization, we nevertheless show that the coexistent fiber-based quantum channel has high process fidelity with an ideal depolarizing channel when the noise is dominated by Raman scattering. These results provide a basis for the future development of quantum repeater designs and quantum error correcting codes for real-world channels and inform models used in the analysis and simulation of quantum networks. Copyright © 2022, The Authors. All rights reserved.

关键词： Tomography

26th Annual Computational Neuroscience Meeting (CNS*2017) of the Organization for Computational Neuroscience Antwerp, Belgium, July 15-20, 2017

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 59-59页

作者： [Anonymous] Indiana University Purdue University Indianapolis Indianapolis IN 46032 USA Stark Neurosciences Research Institute Indiana University School of Medicine Indianapolis IN 46032 USA Department of Mathematics East Carolina University Greenville NC 27858 USA Jülich Supercomputing Centre Forschungszentrum Jülich 52425 Jülich Germany Future Systems Swiss National Supercomputing Centre 8092 Zurich Switzerland User Engagement and Support Swiss National Supercomputing Centre 6900 Lugano Switzerland Institut de Neurosciences des Systèmes Aix Marseille Univ 13005 Marseille France Simulation Lab Neuroscience Forschungszentrum Jülich Jülich Germany Department of Experimental Psychology Ghent University 9000 Ghent Belgium Donders Center for Cognitive Neuroimaging Radboud University 6525HR Nijmegen The Netherlands Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO 80309 USA Department of Neurosurgery Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Neurology Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Otolaryngology Johns Hopkins School of Medicine Baltimore MD 21287 USA INSERM U968 Paris France Sorbonne Universités UPMC University Paris 06 UMR_S 968 Institut de la Vision Paris France CNRS UMR_7210 Paris France Department of Computer Architecture and Technology University of Granada (CITIC) Granada Spain Sorbonne Universités UPMC Univ Paris 06 INSERM CNRS Institut de la Vision Paris France Department of Adaptive Machine Systems Osaka University Osaka Japan Department of Computer Science University of Cergy-Pontoise Cergy-Pontoise France Department of Physics and Astronomy College of Charleston Charleston SC 29424 USA School of Physics Faculty of Science University of Sydney Sydney NSW 2006 Australia Center of Excellence for Integrative Brain Function Australian Research Council Sydney Australia Max Planck Institute for Human Cognitive and Brain Sciences Saxony Lei