Remote state preparation(RSP)provides a useful way of transferring quantum information between two distant nodes based on the previously shared entanglement.In this paper,we study RSP of an arbitrary single-photon sta...Remote state preparation(RSP)provides a useful way of transferring quantum information between two distant nodes based on the previously shared entanglement.In this paper,we study RSP of an arbitrary single-photon state in two degrees of freedom(DoFs).Using hyper-entanglement as a shared resource,our first goal is to remotely prepare the single-photon state in polarization and frequency DoFs and the second one is to reconstruct the single-photon state in polarization and time-bin DoFs.In the RSP process,the sender will rotate the quantum state in each DoF of the photon according to the knowledge of the state to be communicated.By performing a projective measurement on the polarization of the sender’s photon,the original single-photon state in two DoFs can be remotely reconstructed at the receiver’s quantum systems.This work demonstrates a novel capability for longdistance quantum communication.展开更多
The secure key rate of quantum key distribution(QKD)is greatly reduced because of the untrusted devices.In this paper,to raise the secure key rate of QKD,a device-independent quantum key distribution(DIQKD)protocol is...The secure key rate of quantum key distribution(QKD)is greatly reduced because of the untrusted devices.In this paper,to raise the secure key rate of QKD,a device-independent quantum key distribution(DIQKD)protocol is proposed based on hyper-entangled states and Bell inequalities.The security of the protocol is analyzed against the individual attack by an adversary only limited by the no-signaling condition.Based on the formalization of Clauser-Horne Shimony-Holt(CHSH)violation measurement on local correlation,the probability of a secure secret bit is obtained,which is produced by a pair of hyper-entangled particles.By analyzing the secure secret bit,it is proven that,when both the polarization mode and the path mode contains entangled-states,the DIQKD protocol gets a better secure key rate than common Bell states.展开更多
Quantum secret sharing(QSS) is a typical multi-party quantum communication mode, in which the key sender splits a key into several parts and the participants can obtain the key by cooperation. Measurement-device-indep...Quantum secret sharing(QSS) is a typical multi-party quantum communication mode, in which the key sender splits a key into several parts and the participants can obtain the key by cooperation. Measurement-device-independent quantum secret sharing(MDI-QSS) is immune to all possible attacks from measurement devices and can greatly enhance QSS's security in practical applications. However, previous MDI-QSS's key generation rate is relatively low. Here, we adopt the polarization-spatial-mode hyper-encoding technology in the MDI-QSS, which can increase single photon's channel capacity. Meanwhile, we use the cross-Kerr nonlinearity to realize the complete hyper-entangled Greenberger-Horne-Zeilinger state analysis. Both above factors can increase MDI-QSS's key generation rate by about 10^(3). The proposed hyper-encoded MDI-QSS protocol may be useful for future multiparity quantum communication applications.展开更多
基金the National Natural Science Foundation of China under Grant Nos.11805050 and 12071110Hebei Natural Science Foundation of China under Grant Nos.A2019205190,A2020205014,and A2018205125+2 种基金Graduate Scientific Innovative Foundation of the Education Department of Hebei Province under Grant No.CXZZBS2019079the Education Department of Hebei Province Natural Science Foundation under Grant No.ZD2020167the Science Foundation of Hebei Normal University under Grant No.L2021B13.
文摘Remote state preparation(RSP)provides a useful way of transferring quantum information between two distant nodes based on the previously shared entanglement.In this paper,we study RSP of an arbitrary single-photon state in two degrees of freedom(DoFs).Using hyper-entanglement as a shared resource,our first goal is to remotely prepare the single-photon state in polarization and frequency DoFs and the second one is to reconstruct the single-photon state in polarization and time-bin DoFs.In the RSP process,the sender will rotate the quantum state in each DoF of the photon according to the knowledge of the state to be communicated.By performing a projective measurement on the polarization of the sender’s photon,the original single-photon state in two DoFs can be remotely reconstructed at the receiver’s quantum systems.This work demonstrates a novel capability for longdistance quantum communication.
基金This work is supported by NSFC(Grant Nos.61572086,61402058)the Application Foundation Project of Sichuan Province of China(Grant No.2017JY0168)+3 种基金the National Key Research and Development Program(No.2017YFB0802302)Sichuan innovation team of quantum security communication(No.17TD0009)Sichuan academic and technical leaders training funding support projects(No.2016120080102643)the Fund for Middle and Young Academic Leaders of CUIT(Grant No.J201511).
文摘The secure key rate of quantum key distribution(QKD)is greatly reduced because of the untrusted devices.In this paper,to raise the secure key rate of QKD,a device-independent quantum key distribution(DIQKD)protocol is proposed based on hyper-entangled states and Bell inequalities.The security of the protocol is analyzed against the individual attack by an adversary only limited by the no-signaling condition.Based on the formalization of Clauser-Horne Shimony-Holt(CHSH)violation measurement on local correlation,the probability of a secure secret bit is obtained,which is produced by a pair of hyper-entangled particles.By analyzing the secure secret bit,it is proven that,when both the polarization mode and the path mode contains entangled-states,the DIQKD protocol gets a better secure key rate than common Bell states.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 11974189 and 12175106)。
文摘Quantum secret sharing(QSS) is a typical multi-party quantum communication mode, in which the key sender splits a key into several parts and the participants can obtain the key by cooperation. Measurement-device-independent quantum secret sharing(MDI-QSS) is immune to all possible attacks from measurement devices and can greatly enhance QSS's security in practical applications. However, previous MDI-QSS's key generation rate is relatively low. Here, we adopt the polarization-spatial-mode hyper-encoding technology in the MDI-QSS, which can increase single photon's channel capacity. Meanwhile, we use the cross-Kerr nonlinearity to realize the complete hyper-entangled Greenberger-Horne-Zeilinger state analysis. Both above factors can increase MDI-QSS's key generation rate by about 10^(3). The proposed hyper-encoded MDI-QSS protocol may be useful for future multiparity quantum communication applications.
