Academic bet365 games best slots 1
bet365 games best slotsTitle:Continuous variable bet365 games best slots based on Gaussian post-selection virtual zero-photon quantum catalysis
bet365 games best slots time：2021Year11month25日 Morning8:30
bet365 games best slots location: Comprehensive Laboratory Building of Railway College401
bet365 games best slotsPeople：Zhong Hai
bet365 games best slots Summary:Optical quantum catalysis is a method to improve continuous variable subkey distribution(CVQKD)A feasible solution for performance，Especially zero-photon quantum catalysis。But in practical application，Due to photon number resolution detector or on/Imperfection of the detector，Limits the improvement effect。In this article，We show that the zero-photon quantum catalytic operation at the transmitter can be simulated simply using the Gaussian post-selection method，No need to use actual devices to implement。This virtual zero-photon quantum catalysis can not only achieve the ideal situation for its practical application，And maintains the advantages of Gaussian security proof。Based on Gaussian modulation coherent state protocol and experimental reachable parameters，We analyzed the asymptotic security of the scheme under collective publicity。Simulation results show，In the case of asymptotic safety，CVQKDcan also be obtainedImprovement，Especially when the modulation variance is large。We also found that the electronic noise of the detector has a significant impact on the proposed scheme。The greater the electronic noise，Virtual zero photon quantum catalytic pairCVQKDThe smaller the improvement of the system。This virtual solution will enable zero-photon quantum catalysisCVQKDare possible.
Academic bet365 games best slots 2
bet365 games best slotsTitle:Research on the coexistence of continuous variable bet365 games best slots and classical signals in few-mode optical fiber
bet365 games best slots time：2021Year11month25日 Morning9:30
bet365 games best slots location: Comprehensive Laboratory Building of Railway CollegeConference room on the third floor
bet365 games best slotsPeople：Zhong Hai
bet365 games best slots Summary:Continuous variable bet365 games best slots(CVQKD)Good compatibility with classic coherent optical communications。However，On single-mode fiber，Due to the existence of spontaneous Raman scattering，CVQKDThere is a performance trade-off with classic communication。By using space division multiplexing(SDM)Technology, DangCVQKDWith classical signals in few-mode fiber(FMF)When coexisting on the Internet，Can overcome the performance trade-offs mentioned above。Here，We studied itCVQKDWith classic signals inFMFThe feasibility of coexistence，And analyze the impact of noise under weak coupling conditions。Research Discovery，Inter-mode crosstalk caused by inter-mode coupling and re-coupling and differential group delay(DGD)is the main source of noise.DGDMay be based onFMF'sCVQKDOne of the main limitations in the development of high-speed systems一。In addition，In order to achieve positive key rate，Good wavelength management is needed to suppress inter-mode four-wave mixing。The numerical simulation results are confirmedCVQKDKey parameters of the system，Provides useful insights into the security analysis of Gaussian modulated coherent state protocols。The results show，CVQKDCoexistence with high power classical signalsFMFThe above is feasible，Can be implemented on standard communication devices，and can run at higher key rates。These results may be actual high ratesCVQKDwith based onFMF's configuration integration provides a potential guide.
Academic bet365 games best slots 3
bet365 games best slots title:Basically encoded multi-bit continuous variable quantum digital signature
bet365 games best slots time：2021Year11month25Day morning10:00
bet365 games best slots location: Comprehensive Laboratory Building of Railway College401
bet365 games best slotsPeople：Zhao Wei
bet365 games best slots Summary:Quantum digital signature is used to authenticate classical information，And provide information theoretic security guaranteed by the laws of quantum mechanics。Previous quantum digital signature protocols shared keys through bet365 games best slots，It focuses on the research of single-bit message signature scheme，And only mentions the signing of multi-bit messages by appropriately iterating single-bit signature schemes。Although the quantum digital signature protocol is unconditionally secure when sending single-bit messages，But a simple way to iterate a single-bit protocol to achieve the sending of multi-bit messages，There will be forgery attacks。Under the premise of ensuring non-repudiation and unforgeability，Signature issues for single-bit and multi-bit messages，Proposed corresponding quantum digital signature schemes based on continuous variables，Compare the differences between the signature distribution phase and the message delivery phase and analyze their security。
Academic bet365 games best slots 4
bet365 games best slotsTitle: Continuous variable bet365 games best slots protocol based on local local oscillator
bet365 games best slots time：2021Year11month25日 Morning11:00
bet365 games best slots location: Comprehensive Laboratory Building of Railway College401
bet365 games best slotsPeople：Zhao Wei
bet365 games best slots summary: Measurement device independent(Measurement-device-independent, MDI) 24203_24214(CVQKD)Protocol calibrates the phase reference frame by transmitting local oscillator pulses between two legitimate parties，That is, the local oscillator pulse is used as the phase reference light of the quantum signal pulse，By senderAlice Send the local oscillator pulse to the receiver via the quantum channelBob。There are security vulnerabilities in the implementation of the above scheme，An eavesdropper can attack the system by manipulating the power of the local oscillator pulse，For example, local oscillator pulse wave attack、Calibration attacks, etc.。This bet365 games best slots proposes a method based onMDI Local local oscillator scheme of the structure，That is, the local oscillator pulse is generated at the receiving end，No need to go throughAliceANDBob 24883_24892。Different from previous solutions that use Gaussian modulation，This bet365 games best slots was submitted inMDI-CVQKD Discrete modulation is used in the protocol，Discrete modulation can achieve better negotiation efficiency under low signal-to-noise ratio。
