The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Liang Jiang - One of the best experts on this subject based on the ideXlab platform.
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Optimal architectures for long distance quantum communication
Scientific Reports, 2016Co-Authors: Sreraman Muralidharan, Linshu Li, Jungsang Kim, Mikhail D. Lukin, Norbert Lütkenhaus, Liang JiangAbstract:Despite the tremendous progress of quantum cryptography, efficient quantum communication over long distances (≥1000 km) remains an outstanding challenge due to fiber attenuation and operation errors accumulated over the entire communication distance. Quantum repeaters (QRs), as a promising approach, can overcome both photon loss and operation errors, and hence significantly speedup the communication rate. Depending on the methods used to correct loss and operation errors, all the proposed QR schemes can be classified into three categories (generations). Here we present the first systematic comparison of three generations of quantum repeaters by evaluating the cost of both temporal and physical resources, and identify the optimized quantum repeater architecture for a given set of experimental parameters for use in quantum key distribution. Our work provides a roadmap for the experimental realizations of highly efficient quantum networks over transcontinental distances.
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efficient long distance quantum communication
arXiv: Quantum Physics, 2015Co-Authors: Sreraman Muralidharan, Jungsang Kim, Mikhail D. Lukin, Norbert Lütkenhaus, Liang JiangAbstract:Despite the tremendous progress of quantum cryptography, efficient quantum communication over long distances (>1000km) remains an outstanding challenge due to fiber attenuation and operation errors accumulated over the entire communication distance. Quantum repeaters, as a promising approach, can overcome both photon loss and operation errors, and hence significantly speedup the communication rate. Depending on the methods used to correct loss and operation errors, all the proposed QR schemes can be classified into three categories (generations). Here we present the first systematic comparison of three generations of quantum repeaters by evaluating the cost of both temporal and physical resources, and identify the optimized quantum repeater architecture for a given set of experimental parameters. Our work provides a roadmap for the experimental realizations of highly efficient quantum networks over transcontinental distances.
V M Zorin - One of the best experts on this subject based on the ideXlab platform.
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optimization of the heating surfaces of turbine Reheaters at nuclear power stations
Thermal Engineering, 1999Co-Authors: A S Shirani, V M ZorinAbstract:The results of optimization of minimal temperature differences δt in the stages of the reheater of a steam-turbine plant are presented as a function of a complex quantity that unites external and internal parameters, which are the initial data in calculations of thermal schemes; the results of optimization of δt for four steam-turbine plants at nuclear power stations are given; they can be used in developing new separators and Reheaters.
J. Lee - One of the best experts on this subject based on the ideXlab platform.
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power from a hot gas stream with superheater and reheater in parallel
International Journal of Heat and Mass Transfer, 2014Co-Authors: Adria Eja, Sandra Lorente, Y. Kim, J. LeeAbstract:Abstract In this paper we determine the fundamental relation between global performance and flow configuration (constructal design) in the case of steam power generation with superheater and reheater placed in parallel in the same stream of hot gases of combustion. The superheater heats the steam for the high pressure turbine, and the reheater supplies steam to the low pressure turbine. Both turbines operate irreversibly. We consider superheaters and Reheaters with balanced counter flows and unbalanced counter flows. The total heat transfer area (or the overall number of heat transfer units) is finite. We show that the heat transfer area can be allocated to the superheater and reheater such that the overall power output is maximum. The optimal area allocation ratio is reported for two scenarios: designs with and without a maximum allowable steam temperature.
Norbert Lütkenhaus - One of the best experts on this subject based on the ideXlab platform.
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Optimal architectures for long distance quantum communication
Scientific Reports, 2016Co-Authors: Sreraman Muralidharan, Linshu Li, Jungsang Kim, Mikhail D. Lukin, Norbert Lütkenhaus, Liang JiangAbstract:Despite the tremendous progress of quantum cryptography, efficient quantum communication over long distances (≥1000 km) remains an outstanding challenge due to fiber attenuation and operation errors accumulated over the entire communication distance. Quantum repeaters (QRs), as a promising approach, can overcome both photon loss and operation errors, and hence significantly speedup the communication rate. Depending on the methods used to correct loss and operation errors, all the proposed QR schemes can be classified into three categories (generations). Here we present the first systematic comparison of three generations of quantum repeaters by evaluating the cost of both temporal and physical resources, and identify the optimized quantum repeater architecture for a given set of experimental parameters for use in quantum key distribution. Our work provides a roadmap for the experimental realizations of highly efficient quantum networks over transcontinental distances.
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efficient long distance quantum communication
arXiv: Quantum Physics, 2015Co-Authors: Sreraman Muralidharan, Jungsang Kim, Mikhail D. Lukin, Norbert Lütkenhaus, Liang JiangAbstract:Despite the tremendous progress of quantum cryptography, efficient quantum communication over long distances (>1000km) remains an outstanding challenge due to fiber attenuation and operation errors accumulated over the entire communication distance. Quantum repeaters, as a promising approach, can overcome both photon loss and operation errors, and hence significantly speedup the communication rate. Depending on the methods used to correct loss and operation errors, all the proposed QR schemes can be classified into three categories (generations). Here we present the first systematic comparison of three generations of quantum repeaters by evaluating the cost of both temporal and physical resources, and identify the optimized quantum repeater architecture for a given set of experimental parameters. Our work provides a roadmap for the experimental realizations of highly efficient quantum networks over transcontinental distances.
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memory assisted measurement device independent quantum key distribution
arXiv: Quantum Physics, 2013Co-Authors: Christiana Panayi, Mohsen Razavi, Norbert LütkenhausAbstract:A protocol with the potential of beating the existing distance records for conventional quantum key distribution (QKD) systems is proposed. It borrows ideas from quantum repeaters by using memories in the middle of the link, and that of measurement-device-independent QKD, which only requires optical source equipment at the user's end. For certain fast memories, our scheme allows a higher repetition rate than that of quantum repeaters, thereby requiring lower coherence times. By accounting for various sources of nonideality, such as memory decoherence, dark counts, misalignment errors, and background noise, as well as timing issues with memories, we develop a mathematical framework within which we can compare QKD systems with and without memories. In particular, we show that with the state-of-the-art technology for quantum memories, it is possible to devise memory-assisted QKD systems that, at certain distances of practical interest, outperform current QKD implementations.
Sreraman Muralidharan - One of the best experts on this subject based on the ideXlab platform.
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Optimal architectures for long distance quantum communication
Scientific Reports, 2016Co-Authors: Sreraman Muralidharan, Linshu Li, Jungsang Kim, Mikhail D. Lukin, Norbert Lütkenhaus, Liang JiangAbstract:Despite the tremendous progress of quantum cryptography, efficient quantum communication over long distances (≥1000 km) remains an outstanding challenge due to fiber attenuation and operation errors accumulated over the entire communication distance. Quantum repeaters (QRs), as a promising approach, can overcome both photon loss and operation errors, and hence significantly speedup the communication rate. Depending on the methods used to correct loss and operation errors, all the proposed QR schemes can be classified into three categories (generations). Here we present the first systematic comparison of three generations of quantum repeaters by evaluating the cost of both temporal and physical resources, and identify the optimized quantum repeater architecture for a given set of experimental parameters for use in quantum key distribution. Our work provides a roadmap for the experimental realizations of highly efficient quantum networks over transcontinental distances.
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efficient long distance quantum communication
arXiv: Quantum Physics, 2015Co-Authors: Sreraman Muralidharan, Jungsang Kim, Mikhail D. Lukin, Norbert Lütkenhaus, Liang JiangAbstract:Despite the tremendous progress of quantum cryptography, efficient quantum communication over long distances (>1000km) remains an outstanding challenge due to fiber attenuation and operation errors accumulated over the entire communication distance. Quantum repeaters, as a promising approach, can overcome both photon loss and operation errors, and hence significantly speedup the communication rate. Depending on the methods used to correct loss and operation errors, all the proposed QR schemes can be classified into three categories (generations). Here we present the first systematic comparison of three generations of quantum repeaters by evaluating the cost of both temporal and physical resources, and identify the optimized quantum repeater architecture for a given set of experimental parameters. Our work provides a roadmap for the experimental realizations of highly efficient quantum networks over transcontinental distances.