Software defined networking (SDN) and network function virtualization (NFV) are two most promising approaches for implementing the network virtualization. Traditional Internet will be transformed into SDN/NFV-enabled ...
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Quantum correlation is a fundamental property that distinguishes quantum systems from classical ones,and is also a fragile resource under projective ***,it has been shown that a subsystem in entangled pairs can share ...
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Quantum correlation is a fundamental property that distinguishes quantum systems from classical ones,and is also a fragile resource under projective ***,it has been shown that a subsystem in entangled pairs can share nonlocalities with multiple observers in *** we present a new steering scenario where both subsystems are accessible by multiple *** results show that the two qubits in a singlet state can be simultaneously steered separately by two sequential observers.
In order to make cloud users get credible, high-quality composition of services, the trust quality of service aware(TQoS-aware) based parallel ant colony algorithm is proposed. Our approach takes the service credibili...
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In order to make cloud users get credible, high-quality composition of services, the trust quality of service aware(TQoS-aware) based parallel ant colony algorithm is proposed. Our approach takes the service credibility as the weight of the quality of service, then calculates the trust service quality T-QoS for each service, making the service composition situated in a credible environment. Through the establishment on a per-service T-QoS initialization pheromone matrix, we can reduce the colony's initial search time. By modifying the pheromone updating rules and introducing two ant colonies to search from different angles in parallel,we can avoid falling into the local optimal solution, and quickly find the optimal combination of global solutions. Experiments show that our approach can combine high-quality services and the improvement of the operational success rate. Also, the convergence rate and the accuracy of optimal combination are improved.
Encoding system plays a significant role in quantum key distribution(QKD).However,the security and performance of QKD systems can be compromised by encoding misalignment due to the inevitable defects in realistic *** ...
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Encoding system plays a significant role in quantum key distribution(QKD).However,the security and performance of QKD systems can be compromised by encoding misalignment due to the inevitable defects in realistic *** alleviate the influence of misalignments,a method exploiting statistics from mismatched basis is proposed to enable uncharacterized sources to generate secure keys in *** this work,we propose a scheme on four-intensity decoy-state quantum key distribution with uncharacterized heralded single-photon *** only requires the source states are prepared in a two-dimensional Hilbert space,and can thus reduce the complexity of practical ***,we carry out corresponding numerical simulations and demonstrate that our present four-intensity decoy-state scheme can achieve a much higher key rate compared than a three-intensity decoy-state method,and meantime it can obtain a longer transmission distance compared than the one using weak coherent sources.
In this paper we consider a two-way relaying system, where two users A and B wish to exchange information with the help of a common relay R., To decode the superimposed signal from A and B efficiently, we propose a ne...
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Atmospheric turbulence(AT) induced crosstalk can significantly impair the performance of a free-space optical(FSO)communication link using orbital angular momentum(OAM) *** this paper,we propose a multiple-user ...
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Atmospheric turbulence(AT) induced crosstalk can significantly impair the performance of a free-space optical(FSO)communication link using orbital angular momentum(OAM) *** this paper,we propose a multiple-user detection(MUD) turbulence mitigation scheme in an OAM-multiplexed FSO communication ***,we present a MUD equivalent communication model for an OAM-multiplexed FSO communication link under *** the equivalent model,each input bit stream represents one user's *** deformed OAM spatial modes caused by AT,instead of the pure OAM spatial modes,are used as information carriers,and the overlapping between the deformed OAM spatial modes are computed as the correlation coefficients between the ***,we present a turbulence mitigation scheme based on MUD idea to enhance AT tolerance of the OAM-multiplexed FSO communication *** the proposed scheme,the crosstalk caused by AT is used as a useful component to deduce users' *** numerical results show that the performance of the OAM-multiplexed communication link has greatly improved by the proposed *** the turbulence strength C_n^2 is 1 × 10^(-15) m^(-2/3),the transmission distance is 1000 m and the channel signal-to-noise ratio(SNR)is 26 dB,the bit-error-rate(BER) performance of four spatial multiplexed OAM modes l_m = + 1,+2,+3,+4 are all close to 10-5,and there is a 2-3 fold increase in the BER performance in comparison with those results without the proposed *** addition,the proposed scheme is more effective for an OAM-multiplexed FSO communication link with a larger OAM mode topological charge *** proposed scheme is a promising direction for compensating the interference caused by AT in the OAM-multiplexed FSO communication link.
The mainstream approaches to green networking are discussed first from the view of engineering,including resource consolidation,server virtualization,selective connectedness,and proportional computing.A brief introduc...
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The mainstream approaches to green networking are discussed first from the view of engineering,including resource consolidation,server virtualization,selective connectedness,and proportional computing.A brief introduction to network virtualization techniques is given then and a virtual node embedding approach is ***,three kinds of enhanced green networking schemes by network virtualization are proposed,that is enhancement to sever virtualization,resource consolidation and Adaptive Link Rate(ALR).Examples are included to show the virtue of network virtualization to green networking in terms of energy efficient communications.
In this paper, we revisit the problem of target detection in wirelesssensornetworks (WSNs). Because that the practical environment of WSNs is very complex, and usually the target signal is mixed with a lot of random...
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We describe a high efcient entanglement concentration protocol(ECP)for multi-particle less-entangled nitrogen-vacancy(N-V)center and microtoroidal resonator *** the ECP,we only require one pair of less-entangled state...
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We describe a high efcient entanglement concentration protocol(ECP)for multi-particle less-entangled nitrogen-vacancy(N-V)center and microtoroidal resonator *** the ECP,we only require one pair of less-entangled state,two auxiliary N-V center in microcavities and some single *** the photon passing through the microcavity,by measuring the polarization of the photon,a maximally entangled W state can be obtained with some success *** ECP does not need to destroy the solid qubit,which makes it more ***,by resorting to more single photons,it can be repeated to reach a high success *** features make this ECP useful in current long-distance quantum communications.
The hybrid entangled state is widely discussed in quantum information processing. In this paper, we propose the first protocol to directly measure the concurrence of the hybrid entangled state. To complete the measure...
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The hybrid entangled state is widely discussed in quantum information processing. In this paper, we propose the first protocol to directly measure the concurrence of the hybrid entangled state. To complete the measurement, we design parity check measurements(PCMs) for both the single polarization qubit and the coherent state. In this protocol, we perform three rounds of PCMs. The results show that we can convert the concurrence into the success probability of picking up the correct states from the initial entangled states. This protocol only uses polarization beam splitters, beam splitters, and weak cross-Kerr nonlinearities, which is feasible for future experiments. This protocol may be useful in future quantum information processing.
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